X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=4cf928f83a3049a443e1cb5bf9404914ed7e2a06;hp=0b81e1c4f985ea08dfc657682576d467e060bae1;hb=22f5f6281fc25f43a85938e9dad2480b2595c471;hpb=03ad1136ba6ddaeca626aa24362dab764c7e2398 diff --git a/src/shared/util.c b/src/shared/util.c index 0b81e1c4f..2b76a5c88 100644 --- a/src/shared/util.c +++ b/src/shared/util.c @@ -50,11 +50,16 @@ #include #include #include -#include #include #include #include #include +#include +#include +#include +#include +#include +#include #include "macro.h" #include "util.h" @@ -66,10 +71,16 @@ #include "path-util.h" #include "exit-status.h" #include "hashmap.h" +#include "env-util.h" +#include "fileio.h" +#include "utf8.h" int saved_argc = 0; char **saved_argv = NULL; +static volatile unsigned cached_columns = 0; +static volatile unsigned cached_lines = 0; + size_t page_size(void) { static __thread size_t pgsz = 0; long r; @@ -77,10 +88,10 @@ size_t page_size(void) { if (_likely_(pgsz > 0)) return pgsz; - assert_se((r = sysconf(_SC_PAGESIZE)) > 0); + r = sysconf(_SC_PAGESIZE); + assert(r > 0); pgsz = (size_t) r; - return pgsz; } @@ -97,80 +108,7 @@ bool streq_ptr(const char *a, const char *b) { return false; } -usec_t now(clockid_t clock_id) { - struct timespec ts; - - assert_se(clock_gettime(clock_id, &ts) == 0); - - return timespec_load(&ts); -} - -dual_timestamp* dual_timestamp_get(dual_timestamp *ts) { - assert(ts); - - ts->realtime = now(CLOCK_REALTIME); - ts->monotonic = now(CLOCK_MONOTONIC); - - return ts; -} - -dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) { - int64_t delta; - assert(ts); - - ts->realtime = u; - - if (u == 0) - ts->monotonic = 0; - else { - delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u; - - ts->monotonic = now(CLOCK_MONOTONIC); - - if ((int64_t) ts->monotonic > delta) - ts->monotonic -= delta; - else - ts->monotonic = 0; - } - - return ts; -} - -usec_t timespec_load(const struct timespec *ts) { - assert(ts); - - return - (usec_t) ts->tv_sec * USEC_PER_SEC + - (usec_t) ts->tv_nsec / NSEC_PER_USEC; -} - -struct timespec *timespec_store(struct timespec *ts, usec_t u) { - assert(ts); - - ts->tv_sec = (time_t) (u / USEC_PER_SEC); - ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC); - - return ts; -} - -usec_t timeval_load(const struct timeval *tv) { - assert(tv); - - return - (usec_t) tv->tv_sec * USEC_PER_SEC + - (usec_t) tv->tv_usec; -} - -struct timeval *timeval_store(struct timeval *tv, usec_t u) { - assert(tv); - - tv->tv_sec = (time_t) (u / USEC_PER_SEC); - tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC); - - return tv; -} - -bool endswith(const char *s, const char *postfix) { +char* endswith(const char *s, const char *postfix) { size_t sl, pl; assert(s); @@ -180,54 +118,15 @@ bool endswith(const char *s, const char *postfix) { pl = strlen(postfix); if (pl == 0) - return true; - - if (sl < pl) - return false; - - return memcmp(s + sl - pl, postfix, pl) == 0; -} - -bool startswith(const char *s, const char *prefix) { - size_t sl, pl; - - assert(s); - assert(prefix); - - sl = strlen(s); - pl = strlen(prefix); - - if (pl == 0) - return true; - - if (sl < pl) - return false; - - return memcmp(s, prefix, pl) == 0; -} - -bool startswith_no_case(const char *s, const char *prefix) { - size_t sl, pl; - unsigned i; - - assert(s); - assert(prefix); - - sl = strlen(s); - pl = strlen(prefix); - - if (pl == 0) - return true; + return (char*) s + sl; if (sl < pl) - return false; + return NULL; - for(i = 0; i < pl; ++i) { - if (tolower(s[i]) != tolower(prefix[i])) - return false; - } + if (memcmp(s + sl - pl, postfix, pl) != 0) + return NULL; - return true; + return (char*) s + sl - pl; } bool first_word(const char *s, const char *word) { @@ -253,44 +152,62 @@ bool first_word(const char *s, const char *word) { } int close_nointr(int fd) { - assert(fd >= 0); - - for (;;) { - int r; + int r; - r = close(fd); - if (r >= 0) - return r; + assert(fd >= 0); + r = close(fd); - if (errno != EINTR) - return -errno; - } + /* Just ignore EINTR; a retry loop is the wrong + * thing to do on Linux. + * + * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html + * https://bugzilla.gnome.org/show_bug.cgi?id=682819 + * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR + * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain + */ + if (_unlikely_(r < 0 && errno == EINTR)) + return 0; + else if (r >= 0) + return r; + else + return -errno; } void close_nointr_nofail(int fd) { - int saved_errno = errno; + PROTECT_ERRNO; /* like close_nointr() but cannot fail, and guarantees errno * is unchanged */ assert_se(close_nointr(fd) == 0); - - errno = saved_errno; } void close_many(const int fds[], unsigned n_fd) { unsigned i; + assert(fds || n_fd <= 0); + for (i = 0; i < n_fd; i++) close_nointr_nofail(fds[i]); } +int unlink_noerrno(const char *path) { + PROTECT_ERRNO; + int r; + + r = unlink(path); + if (r < 0) + return -errno; + + return 0; +} + int parse_boolean(const char *v) { assert(v); - if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on")) + if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || strcaseeq(v, "on")) return 1; - else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off")) + else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || strcaseeq(v, "off")) return 0; return -EINVAL; @@ -304,7 +221,8 @@ int parse_pid(const char *s, pid_t* ret_pid) { assert(s); assert(ret_pid); - if ((r = safe_atolu(s, &ul)) < 0) + r = safe_atolu(s, &ul); + if (r < 0) return r; pid = (pid_t) ul; @@ -327,7 +245,8 @@ int parse_uid(const char *s, uid_t* ret_uid) { assert(s); assert(ret_uid); - if ((r = safe_atolu(s, &ul)) < 0) + r = safe_atolu(s, &ul); + if (r < 0) return r; uid = (uid_t) ul; @@ -349,8 +268,8 @@ int safe_atou(const char *s, unsigned *ret_u) { errno = 0; l = strtoul(s, &x, 0); - if (!x || *x || errno) - return errno ? -errno : -EINVAL; + if (!x || x == s || *x || errno) + return errno > 0 ? -errno : -EINVAL; if ((unsigned long) (unsigned) l != l) return -ERANGE; @@ -369,8 +288,8 @@ int safe_atoi(const char *s, int *ret_i) { errno = 0; l = strtol(s, &x, 0); - if (!x || *x || errno) - return errno ? -errno : -EINVAL; + if (!x || x == s || *x || errno) + return errno > 0 ? -errno : -EINVAL; if ((long) (int) l != l) return -ERANGE; @@ -389,7 +308,7 @@ int safe_atollu(const char *s, long long unsigned *ret_llu) { errno = 0; l = strtoull(s, &x, 0); - if (!x || *x || errno) + if (!x || x == s || *x || errno) return errno ? -errno : -EINVAL; *ret_llu = l; @@ -406,13 +325,32 @@ int safe_atolli(const char *s, long long int *ret_lli) { errno = 0; l = strtoll(s, &x, 0); - if (!x || *x || errno) + if (!x || x == s || *x || errno) return errno ? -errno : -EINVAL; *ret_lli = l; return 0; } +int safe_atod(const char *s, double *ret_d) { + char *x = NULL; + double d = 0; + + assert(s); + assert(ret_d); + + RUN_WITH_LOCALE(LC_NUMERIC_MASK, "C") { + errno = 0; + d = strtod(s, &x); + } + + if (!x || x == s || *x || errno) + return errno ? -errno : -EINVAL; + + *ret_d = (double) d; + return 0; +} + /* Split a string into words. */ char *split(const char *c, size_t *l, const char *separator, char **state) { char *current; @@ -488,32 +426,35 @@ char *split_quoted(const char *c, size_t *l, char **state) { int get_parent_of_pid(pid_t pid, pid_t *_ppid) { int r; - FILE *f; - char fn[PATH_MAX], line[LINE_MAX], *p; + _cleanup_fclose_ FILE *f = NULL; + char line[LINE_MAX]; long unsigned ppid; + const char *p; - assert(pid > 0); + assert(pid >= 0); assert(_ppid); - assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1)); - char_array_0(fn); + if (pid == 0) { + *_ppid = getppid(); + return 0; + } - if (!(f = fopen(fn, "re"))) + p = procfs_file_alloca(pid, "stat"); + f = fopen(p, "re"); + if (!f) return -errno; - if (!(fgets(line, sizeof(line), f))) { + if (!fgets(line, sizeof(line), f)) { r = feof(f) ? -EIO : -errno; - fclose(f); return r; } - fclose(f); - /* Let's skip the pid and comm fields. The latter is enclosed * in () but does not escape any () in its value, so let's * skip over it manually */ - if (!(p = strrchr(line, ')'))) + p = strrchr(line, ')'); + if (!p) return -EIO; p++; @@ -533,32 +474,35 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) { } int get_starttime_of_pid(pid_t pid, unsigned long long *st) { - int r; - FILE *f; - char fn[PATH_MAX], line[LINE_MAX], *p; + _cleanup_fclose_ FILE *f = NULL; + char line[LINE_MAX]; + const char *p; - assert(pid > 0); + assert(pid >= 0); assert(st); - assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1)); - char_array_0(fn); + if (pid == 0) + p = "/proc/self/stat"; + else + p = procfs_file_alloca(pid, "stat"); - if (!(f = fopen(fn, "re"))) + f = fopen(p, "re"); + if (!f) return -errno; - if (!(fgets(line, sizeof(line), f))) { - r = feof(f) ? -EIO : -errno; - fclose(f); - return r; - } + if (!fgets(line, sizeof(line), f)) { + if (ferror(f)) + return -errno; - fclose(f); + return -EIO; + } /* Let's skip the pid and comm fields. The latter is enclosed * in () but does not escape any () in its value, so let's * skip over it manually */ - if (!(p = strrchr(line, ')'))) + p = strrchr(line, ')'); + if (!p) return -EIO; p++; @@ -590,41 +534,6 @@ int get_starttime_of_pid(pid_t pid, unsigned long long *st) { return 0; } -int write_one_line_file(const char *fn, const char *line) { - FILE *f; - int r; - - assert(fn); - assert(line); - - f = fopen(fn, "we"); - if (!f) - return -errno; - - errno = 0; - if (fputs(line, f) < 0) { - r = -errno; - goto finish; - } - - if (!endswith(line, "\n")) - fputc('\n', f); - - fflush(f); - - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else - r = 0; - -finish: - fclose(f); - return r; -} - int fchmod_umask(int fd, mode_t m) { mode_t u; int r; @@ -636,440 +545,102 @@ int fchmod_umask(int fd, mode_t m) { return r; } -int write_one_line_file_atomic(const char *fn, const char *line) { - FILE *f; - int r; - char *p; - - assert(fn); - assert(line); - - r = fopen_temporary(fn, &f, &p); - if (r < 0) - return r; - - fchmod_umask(fileno(f), 0644); - - errno = 0; - if (fputs(line, f) < 0) { - r = -errno; - goto finish; - } - - if (!endswith(line, "\n")) - fputc('\n', f); +char *truncate_nl(char *s) { + assert(s); - fflush(f); + s[strcspn(s, NEWLINE)] = 0; + return s; +} - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else { - if (rename(p, fn) < 0) - r = -errno; - else - r = 0; - } +int get_process_comm(pid_t pid, char **name) { + const char *p; -finish: - if (r < 0) - unlink(p); + assert(name); + assert(pid >= 0); - fclose(f); - free(p); + if (pid == 0) + p = "/proc/self/comm"; + else + p = procfs_file_alloca(pid, "comm"); - return r; + return read_one_line_file(p, name); } -int read_one_line_file(const char *fn, char **line) { - FILE *f; - int r; - char t[LINE_MAX], *c; +int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { + _cleanup_fclose_ FILE *f = NULL; + char *r = NULL, *k; + const char *p; + int c; - assert(fn); assert(line); + assert(pid >= 0); - f = fopen(fn, "re"); + if (pid == 0) + p = "/proc/self/cmdline"; + else + p = procfs_file_alloca(pid, "cmdline"); + + f = fopen(p, "re"); if (!f) return -errno; - if (!fgets(t, sizeof(t), f)) { + if (max_length == 0) { + size_t len = 0, allocated = 0; - if (ferror(f)) { - r = -errno; - goto finish; - } + while ((c = getc(f)) != EOF) { - t[0] = 0; - } + if (!GREEDY_REALLOC(r, allocated, len+2)) { + free(r); + return -ENOMEM; + } - c = strdup(t); - if (!c) { - r = -ENOMEM; - goto finish; - } + r[len++] = isprint(c) ? c : ' '; + } - truncate_nl(c); + if (len > 0) + r[len-1] = 0; - *line = c; - r = 0; + } else { + bool space = false; + size_t left; -finish: - fclose(f); - return r; -} + r = new(char, max_length); + if (!r) + return -ENOMEM; -int read_full_file(const char *fn, char **contents, size_t *size) { - FILE *f; - int r; - size_t n, l; - char *buf = NULL; - struct stat st; + k = r; + left = max_length; + while ((c = getc(f)) != EOF) { - if (!(f = fopen(fn, "re"))) - return -errno; + if (isprint(c)) { + if (space) { + if (left <= 4) + break; - if (fstat(fileno(f), &st) < 0) { - r = -errno; - goto finish; - } + *(k++) = ' '; + left--; + space = false; + } - /* Safety check */ - if (st.st_size > 4*1024*1024) { - r = -E2BIG; - goto finish; - } + if (left <= 4) + break; - n = st.st_size > 0 ? st.st_size : LINE_MAX; - l = 0; - - for (;;) { - char *t; - size_t k; - - if (!(t = realloc(buf, n+1))) { - r = -ENOMEM; - goto finish; - } - - buf = t; - k = fread(buf + l, 1, n - l, f); - - if (k <= 0) { - if (ferror(f)) { - r = -errno; - goto finish; - } - - break; - } - - l += k; - n *= 2; - - /* Safety check */ - if (n > 4*1024*1024) { - r = -E2BIG; - goto finish; - } - } - - buf[l] = 0; - *contents = buf; - buf = NULL; - - if (size) - *size = l; - - r = 0; - -finish: - fclose(f); - free(buf); - - return r; -} - -int parse_env_file( - const char *fname, - const char *separator, ...) { - - int r = 0; - char *contents = NULL, *p; - - assert(fname); - assert(separator); - - if ((r = read_full_file(fname, &contents, NULL)) < 0) - return r; - - p = contents; - for (;;) { - const char *key = NULL; - - p += strspn(p, separator); - p += strspn(p, WHITESPACE); - - if (!*p) - break; - - if (!strchr(COMMENTS, *p)) { - va_list ap; - char **value; - - va_start(ap, separator); - while ((key = va_arg(ap, char *))) { - size_t n; - char *v; - - value = va_arg(ap, char **); - - n = strlen(key); - if (strncmp(p, key, n) != 0 || - p[n] != '=') - continue; - - p += n + 1; - n = strcspn(p, separator); - - if (n >= 2 && - strchr(QUOTES, p[0]) && - p[n-1] == p[0]) - v = strndup(p+1, n-2); - else - v = strndup(p, n); - - if (!v) { - r = -ENOMEM; - va_end(ap); - goto fail; - } - - if (v[0] == '\0') { - /* return empty value strings as NULL */ - free(v); - v = NULL; - } - - free(*value); - *value = v; - - p += n; - - r ++; - break; - } - va_end(ap); - } - - if (!key) - p += strcspn(p, separator); - } - -fail: - free(contents); - return r; -} - -int load_env_file( - const char *fname, - char ***rl) { - - FILE *f; - char **m = NULL; - int r; - - assert(fname); - assert(rl); - - if (!(f = fopen(fname, "re"))) - return -errno; - - while (!feof(f)) { - char l[LINE_MAX], *p, *u; - char **t; - - if (!fgets(l, sizeof(l), f)) { - if (feof(f)) - break; - - r = -errno; - goto finish; - } - - p = strstrip(l); - - if (!*p) - continue; - - if (strchr(COMMENTS, *p)) - continue; - - if (!(u = normalize_env_assignment(p))) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - t = strv_append(m, u); - free(u); - - if (!t) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - strv_free(m); - m = t; - } - - r = 0; - - *rl = m; - m = NULL; - -finish: - if (f) - fclose(f); - - strv_free(m); - - return r; -} - -int write_env_file(const char *fname, char **l) { - char **i, *p; - FILE *f; - int r; - - r = fopen_temporary(fname, &f, &p); - if (r < 0) - return r; - - fchmod_umask(fileno(f), 0644); - - errno = 0; - STRV_FOREACH(i, l) { - fputs(*i, f); - fputc('\n', f); - } - - fflush(f); - - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else { - if (rename(p, fname) < 0) - r = -errno; - else - r = 0; - } - - if (r < 0) - unlink(p); - - fclose(f); - free(p); - - return r; -} - -char *truncate_nl(char *s) { - assert(s); - - s[strcspn(s, NEWLINE)] = 0; - return s; -} - -int get_process_comm(pid_t pid, char **name) { - int r; - - assert(name); - - if (pid == 0) - r = read_one_line_file("/proc/self/comm", name); - else { - char *p; - if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0) - return -ENOMEM; - - r = read_one_line_file(p, name); - free(p); - } - - return r; -} - -int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { - char *r, *k; - int c; - bool space = false; - size_t left; - FILE *f; - - assert(max_length > 0); - assert(line); - - if (pid == 0) - f = fopen("/proc/self/cmdline", "re"); - else { - char *p; - if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0) - return -ENOMEM; - - f = fopen(p, "re"); - free(p); - } - - if (!f) - return -errno; - - r = new(char, max_length); - if (!r) { - fclose(f); - return -ENOMEM; - } - - k = r; - left = max_length; - while ((c = getc(f)) != EOF) { - - if (isprint(c)) { - if (space) { - if (left <= 4) - break; - - *(k++) = ' '; + *(k++) = (char) c; left--; - space = false; - } - - if (left <= 4) - break; + } else + space = true; + } - *(k++) = (char) c; - left--; - } else - space = true; + if (left <= 4) { + size_t n = MIN(left-1, 3U); + memcpy(k, "...", n); + k[n] = 0; + } else + *k = 0; } - if (left <= 4) { - size_t n = MIN(left-1, 3U); - memcpy(k, "...", n); - k[n] = 0; - } else - *k = 0; - - fclose(f); - /* Kernel threads have no argv[] */ - if (r[0] == 0) { + if (r == NULL || r[0] == 0) { char *t; int h; @@ -1082,7 +653,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char * if (h < 0) return h; - r = join("[", t, "]", NULL); + r = strjoin("[", t, "]", NULL); free(t); if (!r) @@ -1094,7 +665,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char * } int is_kernel_thread(pid_t pid) { - char *p; + const char *p; size_t count; char c; bool eof; @@ -1103,12 +674,10 @@ int is_kernel_thread(pid_t pid) { if (pid == 0) return 0; - if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0) - return -ENOMEM; + assert(pid > 0); + p = procfs_file_alloca(pid, "cmdline"); f = fopen(p, "re"); - free(p); - if (!f) return -errno; @@ -1124,74 +693,85 @@ int is_kernel_thread(pid_t pid) { return 0; } +int get_process_capeff(pid_t pid, char **capeff) { + const char *p; + + assert(capeff); + assert(pid >= 0); + + if (pid == 0) + p = "/proc/self/status"; + else + p = procfs_file_alloca(pid, "status"); + + return get_status_field(p, "\nCapEff:", capeff); +} + int get_process_exe(pid_t pid, char **name) { + const char *p; + char *d; int r; + assert(pid >= 0); assert(name); if (pid == 0) - r = readlink_malloc("/proc/self/exe", name); - else { - char *p; - if (asprintf(&p, "/proc/%lu/exe", (unsigned long) pid) < 0) - return -ENOMEM; + p = "/proc/self/exe"; + else + p = procfs_file_alloca(pid, "exe"); - r = readlink_malloc(p, name); - free(p); - } + r = readlink_malloc(p, name); + if (r < 0) + return r; - return r; + d = endswith(*name, " (deleted)"); + if (d) + *d = '\0'; + + return 0; } -int get_process_uid(pid_t pid, uid_t *uid) { - char *p; - FILE *f; - int r; +static int get_process_id(pid_t pid, const char *field, uid_t *uid) { + _cleanup_fclose_ FILE *f = NULL; + char line[LINE_MAX]; + const char *p; + assert(field); assert(uid); if (pid == 0) return getuid(); - if (asprintf(&p, "/proc/%lu/status", (unsigned long) pid) < 0) - return -ENOMEM; - + p = procfs_file_alloca(pid, "status"); f = fopen(p, "re"); - free(p); - if (!f) return -errno; - while (!feof(f)) { - char line[LINE_MAX], *l; - - if (!fgets(line, sizeof(line), f)) { - if (feof(f)) - break; - - r = -errno; - goto finish; - } + FOREACH_LINE(line, f, return -errno) { + char *l; l = strstrip(line); - if (startswith(l, "Uid:")) { - l += 4; + if (startswith(l, field)) { + l += strlen(field); l += strspn(l, WHITESPACE); l[strcspn(l, WHITESPACE)] = 0; - r = parse_uid(l, uid); - goto finish; + return parse_uid(l, uid); } } - r = -EIO; + return -EIO; +} -finish: - fclose(f); +int get_process_uid(pid_t pid, uid_t *uid) { + return get_process_id(pid, "Uid:", uid); +} - return r; +int get_process_gid(pid_t pid, gid_t *gid) { + assert_cc(sizeof(uid_t) == sizeof(gid_t)); + return get_process_id(pid, "Gid:", gid); } char *strnappend(const char *s, const char *suffix, size_t b) { @@ -1211,8 +791,11 @@ char *strnappend(const char *s, const char *suffix, size_t b) { assert(suffix); a = strlen(s); + if (b > ((size_t) -1) - a) + return NULL; - if (!(r = new(char, a+b+1))) + r = new(char, a+b+1); + if (!r) return NULL; memcpy(r, s, a); @@ -1257,18 +840,18 @@ int readlink_malloc(const char *p, char **r) { } int readlink_and_make_absolute(const char *p, char **r) { - char *target, *k; + _cleanup_free_ char *target = NULL; + char *k; int j; assert(p); assert(r); - if ((j = readlink_malloc(p, &target)) < 0) + j = readlink_malloc(p, &target); + if (j < 0) return j; k = file_in_same_dir(p, target); - free(target); - if (!k) return -ENOMEM; @@ -1303,15 +886,14 @@ int reset_all_signal_handlers(void) { int sig; for (sig = 1; sig < _NSIG; sig++) { - struct sigaction sa; + struct sigaction sa = { + .sa_handler = SIG_DFL, + .sa_flags = SA_RESTART, + }; if (sig == SIGKILL || sig == SIGSTOP) continue; - zero(sa); - sa.sa_handler = SIG_DFL; - sa.sa_flags = SA_RESTART; - /* On Linux the first two RT signals are reserved by * glibc, and sigaction() will return EINVAL for them. */ if ((sigaction(sig, &sa, NULL) < 0)) @@ -1442,7 +1024,6 @@ int rmdir_parents(const char *path, const char *stop) { return 0; } - char hexchar(int x) { static const char table[16] = "0123456789abcdef"; @@ -1463,14 +1044,57 @@ int unhexchar(char c) { return -1; } -char octchar(int x) { - return '0' + (x & 7); -} +char *hexmem(const void *p, size_t l) { + char *r, *z; + const uint8_t *x; -int unoctchar(char c) { + z = r = malloc(l * 2 + 1); + if (!r) + return NULL; - if (c >= '0' && c <= '7') - return c - '0'; + for (x = p; x < (const uint8_t*) p + l; x++) { + *(z++) = hexchar(*x >> 4); + *(z++) = hexchar(*x & 15); + } + + *z = 0; + return r; +} + +void *unhexmem(const char *p, size_t l) { + uint8_t *r, *z; + const char *x; + + assert(p); + + z = r = malloc((l + 1) / 2 + 1); + if (!r) + return NULL; + + for (x = p; x < p + l; x += 2) { + int a, b; + + a = unhexchar(x[0]); + if (x+1 < p + l) + b = unhexchar(x[1]); + else + b = 0; + + *(z++) = (uint8_t) a << 4 | (uint8_t) b; + } + + *z = 0; + return r; +} + +char octchar(int x) { + return '0' + (x & 7); +} + +int unoctchar(char c) { + + if (c >= '0' && c <= '7') + return c - '0'; return -1; } @@ -1563,19 +1187,25 @@ char *cescape(const char *s) { return r; } -char *cunescape_length(const char *s, size_t length) { +char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) { char *r, *t; const char *f; + size_t pl; assert(s); - /* Undoes C style string escaping */ + /* Undoes C style string escaping, and optionally prefixes it. */ + + pl = prefix ? strlen(prefix) : 0; - r = new(char, length+1); + r = new(char, pl+length+1); if (!r) return r; - for (f = s, t = r; f < s + length; f++) { + if (prefix) + memcpy(r, prefix, pl); + + for (f = s, t = r + pl; f < s + length; f++) { if (*f != '\\') { *(t++) = *f; @@ -1686,7 +1316,13 @@ finish: return r; } +char *cunescape_length(const char *s, size_t length) { + return cunescape_length_with_prefix(s, length, NULL); +} + char *cunescape(const char *s) { + assert(s); + return cunescape_length(s, strlen(s)); } @@ -1698,7 +1334,8 @@ char *xescape(const char *s, const char *bad) { * chars, in \xFF style escaping. May be reversed with * cunescape. */ - if (!(r = new(char, strlen(s)*4+1))) + r = new(char, strlen(s) * 4 + 1); + if (!r) return NULL; for (f = s, t = r; *f; f++) { @@ -1725,16 +1362,24 @@ char *bus_path_escape(const char *s) { assert(s); /* Escapes all chars that D-Bus' object path cannot deal - * with. Can be reverse with bus_path_unescape() */ + * with. Can be reverse with bus_path_unescape(). We special + * case the empty string. */ + + if (*s == 0) + return strdup("_"); - if (!(r = new(char, strlen(s)*3+1))) + r = new(char, strlen(s)*3 + 1); + if (!r) return NULL; for (f = s, t = r; *f; f++) { + /* Escape everything that is not a-zA-Z0-9. We also + * escape 0-9 if it's the first character */ + if (!(*f >= 'A' && *f <= 'Z') && !(*f >= 'a' && *f <= 'z') && - !(*f >= '0' && *f <= '9')) { + !(f > s && *f >= '0' && *f <= '9')) { *(t++) = '_'; *(t++) = hexchar(*f >> 4); *(t++) = hexchar(*f); @@ -1752,7 +1397,12 @@ char *bus_path_unescape(const char *f) { assert(f); - if (!(r = strdup(f))) + /* Special case for the empty string */ + if (streq(f, "_")) + return strdup(""); + + r = new(char, strlen(f) + 1); + if (!r) return NULL; for (t = r; *f; f++) { @@ -1789,7 +1439,7 @@ char *ascii_strlower(char *t) { return t; } -bool ignore_file(const char *filename) { +_pure_ static bool ignore_file_allow_backup(const char *filename) { assert(filename); return @@ -1797,7 +1447,6 @@ bool ignore_file(const char *filename) { streq(filename, "lost+found") || streq(filename, "aquota.user") || streq(filename, "aquota.group") || - endswith(filename, "~") || endswith(filename, ".rpmnew") || endswith(filename, ".rpmsave") || endswith(filename, ".rpmorig") || @@ -1806,6 +1455,15 @@ bool ignore_file(const char *filename) { endswith(filename, ".swp"); } +bool ignore_file(const char *filename) { + assert(filename); + + if (endswith(filename, "~")) + return false; + + return ignore_file_allow_backup(filename); +} + int fd_nonblock(int fd, bool nonblock) { int flags; @@ -1844,7 +1502,7 @@ int fd_cloexec(int fd, bool cloexec) { return 0; } -static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) { +_pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) { unsigned i; assert(n_fdset == 0 || fdset); @@ -1927,160 +1585,25 @@ bool chars_intersect(const char *a, const char *b) { return false; } -char *format_timestamp(char *buf, size_t l, usec_t t) { - struct tm tm; - time_t sec; - - assert(buf); - assert(l > 0); - - if (t <= 0) - return NULL; - - sec = (time_t) (t / USEC_PER_SEC); - - if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0) - return NULL; - - return buf; -} - -char *format_timestamp_pretty(char *buf, size_t l, usec_t t) { - usec_t n, d; - - n = now(CLOCK_REALTIME); - - if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t) - return NULL; - - d = n - t; - - if (d >= USEC_PER_YEAR) - snprintf(buf, l, "%llu years and %llu months ago", - (unsigned long long) (d / USEC_PER_YEAR), - (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH)); - else if (d >= USEC_PER_MONTH) - snprintf(buf, l, "%llu months and %llu days ago", - (unsigned long long) (d / USEC_PER_MONTH), - (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY)); - else if (d >= USEC_PER_WEEK) - snprintf(buf, l, "%llu weeks and %llu days ago", - (unsigned long long) (d / USEC_PER_WEEK), - (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY)); - else if (d >= 2*USEC_PER_DAY) - snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY)); - else if (d >= 25*USEC_PER_HOUR) - snprintf(buf, l, "1 day and %lluh ago", - (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR)); - else if (d >= 6*USEC_PER_HOUR) - snprintf(buf, l, "%lluh ago", - (unsigned long long) (d / USEC_PER_HOUR)); - else if (d >= USEC_PER_HOUR) - snprintf(buf, l, "%lluh %llumin ago", - (unsigned long long) (d / USEC_PER_HOUR), - (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE)); - else if (d >= 5*USEC_PER_MINUTE) - snprintf(buf, l, "%llumin ago", - (unsigned long long) (d / USEC_PER_MINUTE)); - else if (d >= USEC_PER_MINUTE) - snprintf(buf, l, "%llumin %llus ago", - (unsigned long long) (d / USEC_PER_MINUTE), - (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC)); - else if (d >= USEC_PER_SEC) - snprintf(buf, l, "%llus ago", - (unsigned long long) (d / USEC_PER_SEC)); - else if (d >= USEC_PER_MSEC) - snprintf(buf, l, "%llums ago", - (unsigned long long) (d / USEC_PER_MSEC)); - else if (d > 0) - snprintf(buf, l, "%lluus ago", - (unsigned long long) d); - else - snprintf(buf, l, "now"); - - buf[l-1] = 0; - return buf; -} - -char *format_timespan(char *buf, size_t l, usec_t t) { - static const struct { - const char *suffix; - usec_t usec; - } table[] = { - { "w", USEC_PER_WEEK }, - { "d", USEC_PER_DAY }, - { "h", USEC_PER_HOUR }, - { "min", USEC_PER_MINUTE }, - { "s", USEC_PER_SEC }, - { "ms", USEC_PER_MSEC }, - { "us", 1 }, - }; - - unsigned i; - char *p = buf; - - assert(buf); - assert(l > 0); - - if (t == (usec_t) -1) - return NULL; - - if (t == 0) { - snprintf(p, l, "0"); - p[l-1] = 0; - return p; - } - - /* The result of this function can be parsed with parse_usec */ - - for (i = 0; i < ELEMENTSOF(table); i++) { - int k; - size_t n; - - if (t < table[i].usec) - continue; - - if (l <= 1) - break; - - k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix); - n = MIN((size_t) k, l); - - l -= n; - p += n; - - t %= table[i].usec; - } - - *p = 0; - - return buf; -} - bool fstype_is_network(const char *fstype) { - static const char * const table[] = { - "cifs", - "smbfs", - "ncpfs", - "nfs", - "nfs4", - "gfs", - "gfs2" - }; - - unsigned i; + static const char table[] = + "cifs\0" + "smbfs\0" + "ncpfs\0" + "ncp\0" + "nfs\0" + "nfs4\0" + "gfs\0" + "gfs2\0"; - for (i = 0; i < ELEMENTSOF(table); i++) - if (streq(table[i], fstype)) - return true; - - return false; + return nulstr_contains(table, fstype); } int chvt(int vt) { - int fd, r = 0; + _cleanup_close_ int fd; - if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) + fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) return -errno; if (vt < 0) { @@ -2089,20 +1612,16 @@ int chvt(int vt) { 0 }; - if (ioctl(fd, TIOCLINUX, tiocl) < 0) { - r = -errno; - goto fail; - } + if (ioctl(fd, TIOCLINUX, tiocl) < 0) + return -errno; vt = tiocl[0] <= 0 ? 1 : tiocl[0]; } if (ioctl(fd, VT_ACTIVATE, vt) < 0) - r = -errno; + return -errno; -fail: - close_nointr_nofail(fd); - return r; + return 0; } int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { @@ -2165,28 +1684,25 @@ int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { } int ask(char *ret, const char *replies, const char *text, ...) { - bool on_tty; assert(ret); assert(replies); assert(text); - on_tty = isatty(STDOUT_FILENO); - for (;;) { va_list ap; char c; int r; bool need_nl = true; - if (on_tty) + if (on_tty()) fputs(ANSI_HIGHLIGHT_ON, stdout); va_start(ap, text); vprintf(text, ap); va_end(ap); - if (on_tty) + if (on_tty()) fputs(ANSI_HIGHLIGHT_OFF, stdout); fflush(stdout); @@ -2305,13 +1821,17 @@ int open_terminal(const char *name, int mode) { * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 */ + assert(!(mode & O_CREAT)); + for (;;) { - if ((fd = open(name, mode)) >= 0) + fd = open(name, mode, 0); + if (fd >= 0) break; if (errno != EIO) return -errno; + /* Max 1s in total */ if (c >= 20) return -errno; @@ -2322,7 +1842,8 @@ int open_terminal(const char *name, int mode) { if (fd < 0) return -errno; - if ((r = isatty(fd)) < 0) { + r = isatty(fd); + if (r < 0) { close_nointr_nofail(fd); return -errno; } @@ -2336,29 +1857,28 @@ int open_terminal(const char *name, int mode) { } int flush_fd(int fd) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN; + struct pollfd pollfd = { + .fd = fd, + .events = POLLIN, + }; for (;;) { char buf[LINE_MAX]; ssize_t l; int r; - if ((r = poll(&pollfd, 1, 0)) < 0) { - + r = poll(&pollfd, 1, 0); + if (r < 0) { if (errno == EINTR) continue; return -errno; - } - if (r == 0) + } else if (r == 0) return 0; - if ((l = read(fd, buf, sizeof(buf))) < 0) { + l = read(fd, buf, sizeof(buf)); + if (l < 0) { if (errno == EINTR) continue; @@ -2367,15 +1887,20 @@ int flush_fd(int fd) { return 0; return -errno; - } - - if (l <= 0) + } else if (l == 0) return 0; } } -int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) { - int fd = -1, notify = -1, r, wd = -1; +int acquire_terminal( + const char *name, + bool fail, + bool force, + bool ignore_tiocstty_eperm, + usec_t timeout) { + + int fd = -1, notify = -1, r = 0, wd = -1; + usec_t ts = 0; assert(name); @@ -2392,40 +1917,59 @@ int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocst * on the same tty as an untrusted user this should not be a * problem. (Which he probably should not do anyway.) */ + if (timeout != (usec_t) -1) + ts = now(CLOCK_MONOTONIC); + if (!fail && !force) { - if ((notify = inotify_init1(IN_CLOEXEC)) < 0) { + notify = inotify_init1(IN_CLOEXEC | (timeout != (usec_t) -1 ? IN_NONBLOCK : 0)); + if (notify < 0) { r = -errno; goto fail; } - if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) { + wd = inotify_add_watch(notify, name, IN_CLOSE); + if (wd < 0) { r = -errno; goto fail; } } for (;;) { - if (notify >= 0) - if ((r = flush_fd(notify)) < 0) + struct sigaction sa_old, sa_new = { + .sa_handler = SIG_IGN, + .sa_flags = SA_RESTART, + }; + + if (notify >= 0) { + r = flush_fd(notify); + if (r < 0) goto fail; + } /* We pass here O_NOCTTY only so that we can check the return * value TIOCSCTTY and have a reliable way to figure out if we * successfully became the controlling process of the tty */ - if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) + fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); + if (fd < 0) return fd; + /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed + * if we already own the tty. */ + assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); + /* First, try to get the tty */ - r = ioctl(fd, TIOCSCTTY, force); + if (ioctl(fd, TIOCSCTTY, force) < 0) + r = -errno; + + assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); /* Sometimes it makes sense to ignore TIOCSCTTY * returning EPERM, i.e. when very likely we already * are have this controlling terminal. */ - if (r < 0 && errno == EPERM && ignore_tiocstty_eperm) + if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) r = 0; - if (r < 0 && (force || fail || errno != EPERM)) { - r = -errno; + if (r < 0 && (force || fail || r != -EPERM)) { goto fail; } @@ -2441,9 +1985,29 @@ int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocst ssize_t l; struct inotify_event *e; - if ((l = read(notify, inotify_buffer, sizeof(inotify_buffer))) < 0) { + if (timeout != (usec_t) -1) { + usec_t n; + + n = now(CLOCK_MONOTONIC); + if (ts + timeout < n) { + r = -ETIMEDOUT; + goto fail; + } + + r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); + if (r < 0) + goto fail; + + if (r == 0) { + r = -ETIMEDOUT; + goto fail; + } + } + + l = read(notify, inotify_buffer, sizeof(inotify_buffer)); + if (l < 0) { - if (errno == EINTR) + if (errno == EINTR || errno == EAGAIN) continue; r = -errno; @@ -2497,18 +2061,19 @@ fail: } int release_terminal(void) { - int r = 0, fd; - struct sigaction sa_old, sa_new; + int r = 0; + struct sigaction sa_old, sa_new = { + .sa_handler = SIG_IGN, + .sa_flags = SA_RESTART, + }; + _cleanup_close_ int fd; - if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC)) < 0) + fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC); + if (fd < 0) return -errno; /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed * by our own TIOCNOTTY */ - - zero(sa_new); - sa_new.sa_handler = SIG_IGN; - sa_new.sa_flags = SA_RESTART; assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); if (ioctl(fd, TIOCNOTTY) < 0) @@ -2516,7 +2081,6 @@ int release_terminal(void) { assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); - close_nointr_nofail(fd); return r; } @@ -2534,13 +2098,13 @@ int sigaction_many(const struct sigaction *sa, ...) { } int ignore_signals(int sig, ...) { - struct sigaction sa; + struct sigaction sa = { + .sa_handler = SIG_IGN, + .sa_flags = SA_RESTART, + }; va_list ap; int r = 0; - zero(sa); - sa.sa_handler = SIG_IGN; - sa.sa_flags = SA_RESTART; if (sigaction(sig, &sa, NULL) < 0) r = -errno; @@ -2555,14 +2119,13 @@ int ignore_signals(int sig, ...) { } int default_signals(int sig, ...) { - struct sigaction sa; + struct sigaction sa = { + .sa_handler = SIG_DFL, + .sa_flags = SA_RESTART, + }; va_list ap; int r = 0; - zero(sa); - sa.sa_handler = SIG_DFL; - sa.sa_flags = SA_RESTART; - if (sigaction(sig, &sa, NULL) < 0) r = -errno; @@ -2611,11 +2174,10 @@ ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) { continue; if (k < 0 && errno == EAGAIN && do_poll) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN; + struct pollfd pollfd = { + .fd = fd, + .events = POLLIN, + }; if (poll(&pollfd, 1, -1) < 0) { if (errno == EINTR) @@ -2660,11 +2222,10 @@ ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) { continue; if (k < 0 && errno == EAGAIN && do_poll) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLOUT; + struct pollfd pollfd = { + .fd = fd, + .events = POLLOUT, + }; if (poll(&pollfd, 1, -1) < 0) { if (errno == EINTR) @@ -2690,73 +2251,10 @@ ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) { return n; } -int parse_usec(const char *t, usec_t *usec) { - static const struct { - const char *suffix; - usec_t usec; - } table[] = { - { "sec", USEC_PER_SEC }, - { "s", USEC_PER_SEC }, - { "min", USEC_PER_MINUTE }, - { "hr", USEC_PER_HOUR }, - { "h", USEC_PER_HOUR }, - { "d", USEC_PER_DAY }, - { "w", USEC_PER_WEEK }, - { "msec", USEC_PER_MSEC }, - { "ms", USEC_PER_MSEC }, - { "m", USEC_PER_MINUTE }, - { "usec", 1ULL }, - { "us", 1ULL }, - { "", USEC_PER_SEC }, - }; - - const char *p; - usec_t r = 0; - - assert(t); - assert(usec); - - p = t; - do { - long long l; - char *e; - unsigned i; - - errno = 0; - l = strtoll(p, &e, 10); - - if (errno != 0) - return -errno; - - if (l < 0) - return -ERANGE; - - if (e == p) - return -EINVAL; - - e += strspn(e, WHITESPACE); - - for (i = 0; i < ELEMENTSOF(table); i++) - if (startswith(e, table[i].suffix)) { - r += (usec_t) l * table[i].usec; - p = e + strlen(table[i].suffix); - break; - } - - if (i >= ELEMENTSOF(table)) - return -EINVAL; - - } while (*p != 0); - - *usec = r; - - return 0; -} - int parse_bytes(const char *t, off_t *bytes) { static const struct { const char *suffix; - off_t factor; + unsigned long long factor; } table[] = { { "B", 1 }, { "K", 1024ULL }, @@ -2769,7 +2267,7 @@ int parse_bytes(const char *t, off_t *bytes) { }; const char *p; - off_t r = 0; + unsigned long long r = 0; assert(t); assert(bytes); @@ -2783,7 +2281,7 @@ int parse_bytes(const char *t, off_t *bytes) { errno = 0; l = strtoll(p, &e, 10); - if (errno != 0) + if (errno > 0) return -errno; if (l < 0) @@ -2796,7 +2294,17 @@ int parse_bytes(const char *t, off_t *bytes) { for (i = 0; i < ELEMENTSOF(table); i++) if (startswith(e, table[i].suffix)) { - r += (off_t) l * table[i].factor; + unsigned long long tmp; + if ((unsigned long long) l > ULLONG_MAX / table[i].factor) + return -ERANGE; + tmp = l * table[i].factor; + if (tmp > ULLONG_MAX - r) + return -ERANGE; + + r += tmp; + if ((unsigned long long) (off_t) r != r) + return -ERANGE; + p = e + strlen(table[i].suffix); break; } @@ -2804,7 +2312,7 @@ int parse_bytes(const char *t, off_t *bytes) { if (i >= ELEMENTSOF(table)) return -EINVAL; - } while (*p != 0); + } while (*p); *bytes = r; @@ -2816,9 +2324,9 @@ int make_stdio(int fd) { assert(fd >= 0); - r = dup2(fd, STDIN_FILENO); - s = dup2(fd, STDOUT_FILENO); - t = dup2(fd, STDERR_FILENO); + r = dup3(fd, STDIN_FILENO, 0); + s = dup3(fd, STDOUT_FILENO, 0); + t = dup3(fd, STDERR_FILENO, 0); if (fd >= 3) close_nointr_nofail(fd); @@ -2826,9 +2334,7 @@ int make_stdio(int fd) { if (r < 0 || s < 0 || t < 0) return -errno; - fd_cloexec(STDIN_FILENO, false); - fd_cloexec(STDOUT_FILENO, false); - fd_cloexec(STDERR_FILENO, false); + /* We rely here that the new fd has O_CLOEXEC not set */ return 0; } @@ -2836,7 +2342,8 @@ int make_stdio(int fd) { int make_null_stdio(void) { int null_fd; - if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) + null_fd = open("/dev/null", O_RDWR|O_NOCTTY); + if (null_fd < 0) return -errno; return make_stdio(null_fd); @@ -2853,45 +2360,57 @@ bool is_device_path(const char *path) { } int dir_is_empty(const char *path) { - DIR *d; + _cleanup_closedir_ DIR *d; int r; - struct dirent buf, *de; - if (!(d = opendir(path))) + d = opendir(path); + if (!d) return -errno; for (;;) { - if ((r = readdir_r(d, &buf, &de)) > 0) { - r = -r; - break; - } + struct dirent *de; + union dirent_storage buf; - if (!de) { - r = 1; - break; - } + r = readdir_r(d, &buf.de, &de); + if (r > 0) + return -r; - if (!ignore_file(de->d_name)) { - r = 0; - break; - } + if (!de) + return 1; + + if (!ignore_file(de->d_name)) + return 0; } +} - closedir(d); - return r; +char* dirname_malloc(const char *path) { + char *d, *dir, *dir2; + + d = strdup(path); + if (!d) + return NULL; + dir = dirname(d); + assert(dir); + + if (dir != d) { + dir2 = strdup(dir); + free(d); + return dir2; + } + + return dir; } unsigned long long random_ull(void) { - int fd; + _cleanup_close_ int fd; uint64_t ull; ssize_t r; - if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) + fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY); + if (fd < 0) goto fallback; r = loop_read(fd, &ull, sizeof(ull), true); - close_nointr_nofail(fd); - if (r != sizeof(ull)) goto fallback; @@ -2949,41 +2468,40 @@ char* gethostname_malloc(void) { assert_se(uname(&u) >= 0); - if (u.nodename[0]) + if (!isempty(u.nodename) && !streq(u.nodename, "(none)")) return strdup(u.nodename); return strdup(u.sysname); } -char* getlogname_malloc(void) { - uid_t uid; +bool hostname_is_set(void) { + struct utsname u; + + assert_se(uname(&u) >= 0); + + return !isempty(u.nodename) && !streq(u.nodename, "(none)"); +} + +static char *lookup_uid(uid_t uid) { long bufsize; - char *buf, *name; + char *name; + _cleanup_free_ char *buf = NULL; struct passwd pwbuf, *pw = NULL; - struct stat st; - - if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0) - uid = st.st_uid; - else - uid = getuid(); /* Shortcut things to avoid NSS lookups */ if (uid == 0) return strdup("root"); - if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0) + bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); + if (bufsize <= 0) bufsize = 4096; - if (!(buf = malloc(bufsize))) + buf = malloc(bufsize); + if (!buf) return NULL; - if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) { - name = strdup(pw->pw_name); - free(buf); - return name; - } - - free(buf); + if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) + return strdup(pw->pw_name); if (asprintf(&name, "%lu", (unsigned long) uid) < 0) return NULL; @@ -2991,18 +2509,42 @@ char* getlogname_malloc(void) { return name; } -int getttyname_malloc(int fd, char **r) { - char path[PATH_MAX], *c; - int k; - - assert(r); +char* getlogname_malloc(void) { + uid_t uid; + struct stat st; + + if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0) + uid = st.st_uid; + else + uid = getuid(); + + return lookup_uid(uid); +} + +char *getusername_malloc(void) { + const char *e; + + e = getenv("USER"); + if (e) + return strdup(e); + + return lookup_uid(getuid()); +} - if ((k = ttyname_r(fd, path, sizeof(path))) != 0) +int getttyname_malloc(int fd, char **r) { + char path[PATH_MAX], *c; + int k; + + assert(r); + + k = ttyname_r(fd, path, sizeof(path)); + if (k != 0) return -k; char_array_0(path); - if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path))) + c = strdup(startswith(path, "/dev/") ? path + 5 : path); + if (!c) return -ENOMEM; *r = c; @@ -3013,7 +2555,8 @@ int getttyname_harder(int fd, char **r) { int k; char *s; - if ((k = getttyname_malloc(fd, &s)) < 0) + k = getttyname_malloc(fd, &s); + if (k < 0) return k; if (streq(s, "tty")) { @@ -3026,27 +2569,29 @@ int getttyname_harder(int fd, char **r) { } int get_ctty_devnr(pid_t pid, dev_t *d) { - int k; - char line[LINE_MAX], *p, *fn; + _cleanup_fclose_ FILE *f = NULL; + char line[LINE_MAX], *p; unsigned long ttynr; - FILE *f; + const char *fn; + int k; - if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0) - return -ENOMEM; + assert(pid >= 0); + assert(d); + + if (pid == 0) + fn = "/proc/self/stat"; + else + fn = procfs_file_alloca(pid, "stat"); f = fopen(fn, "re"); - free(fn); if (!f) return -errno; if (!fgets(line, sizeof(line), f)) { k = feof(f) ? -EIO : -errno; - fclose(f); return k; } - fclose(f); - p = strrchr(line, ')'); if (!p) return -EIO; @@ -3062,13 +2607,16 @@ int get_ctty_devnr(pid_t pid, dev_t *d) { &ttynr) != 1) return -EIO; + if (major(ttynr) == 0 && minor(ttynr) == 0) + return -ENOENT; + *d = (dev_t) ttynr; return 0; } int get_ctty(pid_t pid, dev_t *_devnr, char **r) { int k; - char fn[PATH_MAX], *s, *b, *p; + char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *s, *b, *p; dev_t devnr; assert(r); @@ -3078,9 +2626,9 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) { return k; snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr)); - char_array_0(fn); - if ((k = readlink_malloc(fn, &s)) < 0) { + k = readlink_malloc(fn, &s); + if (k < 0) { if (k != -ENOENT) return k; @@ -3101,7 +2649,8 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) { * symlink in /dev/char. Let's return something * vaguely useful. */ - if (!(b = strdup(fn + 5))) + b = strdup(fn + 5); + if (!b) return -ENOMEM; *r = b; @@ -3131,14 +2680,14 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) { return 0; } -static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) { +int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) { DIR *d; int ret = 0; assert(fd >= 0); /* This returns the first error we run into, but nevertheless - * tries to go on */ + * tries to go on. This closes the passed fd. */ d = fdopendir(fd); if (!d) { @@ -3148,11 +2697,13 @@ static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) { } for (;;) { - struct dirent buf, *de; - bool is_dir, keep_around = false; + struct dirent *de; + union dirent_storage buf; + bool is_dir, keep_around; + struct stat st; int r; - r = readdir_r(d, &buf, &de); + r = readdir_r(d, &buf.de, &de); if (r != 0 && ret == 0) { ret = -r; break; @@ -3164,51 +2715,41 @@ static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) { if (streq(de->d_name, ".") || streq(de->d_name, "..")) continue; - if (de->d_type == DT_UNKNOWN) { - struct stat st; - + if (de->d_type == DT_UNKNOWN || + honour_sticky || + (de->d_type == DT_DIR && root_dev)) { if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { if (ret == 0 && errno != ENOENT) ret = -errno; continue; } - if (honour_sticky) - keep_around = - (st.st_uid == 0 || st.st_uid == getuid()) && - (st.st_mode & S_ISVTX); - is_dir = S_ISDIR(st.st_mode); - + keep_around = + honour_sticky && + (st.st_uid == 0 || st.st_uid == getuid()) && + (st.st_mode & S_ISVTX); } else { - if (honour_sticky) { - struct stat st; - - if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - continue; - } - - keep_around = - (st.st_uid == 0 || st.st_uid == getuid()) && - (st.st_mode & S_ISVTX); - } - is_dir = de->d_type == DT_DIR; + keep_around = false; } if (is_dir) { int subdir_fd; - subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); + /* if root_dev is set, remove subdirectories only, if device is same as dir */ + if (root_dev && st.st_dev != root_dev->st_dev) + continue; + + subdir_fd = openat(fd, de->d_name, + O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); if (subdir_fd < 0) { if (ret == 0 && errno != ENOENT) ret = -errno; continue; } - r = rm_rf_children(subdir_fd, only_dirs, honour_sticky); + r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev); if (r < 0 && ret == 0) ret = r; @@ -3232,18 +2773,65 @@ static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) { return ret; } -int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { - int fd; - int r; +_pure_ static int is_temporary_fs(struct statfs *s) { + assert(s); + return + F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) || + F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC); +} + +int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) { + struct statfs s; + + assert(fd >= 0); + + if (fstatfs(fd, &s) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + /* We refuse to clean disk file systems with this call. This + * is extra paranoia just to be sure we never ever remove + * non-state data */ + if (!is_temporary_fs(&s)) { + log_error("Attempted to remove disk file system, and we can't allow that."); + close_nointr_nofail(fd); + return -EPERM; + } + + return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev); +} + +static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) { + int fd, r; + struct statfs s; assert(path); + /* We refuse to clean the root file system with this + * call. This is extra paranoia to never cause a really + * seriously broken system. */ + if (path_equal(path, "/")) { + log_error("Attempted to remove entire root file system, and we can't allow that."); + return -EPERM; + } + fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); if (fd < 0) { if (errno != ENOTDIR) return -errno; + if (!dangerous) { + if (statfs(path, &s) < 0) + return -errno; + + if (!is_temporary_fs(&s)) { + log_error("Attempted to remove disk file system, and we can't allow that."); + return -EPERM; + } + } + if (delete_root && !only_dirs) if (unlink(path) < 0 && errno != ENOENT) return -errno; @@ -3251,8 +2839,20 @@ int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky return 0; } - r = rm_rf_children(fd, only_dirs, honour_sticky); + if (!dangerous) { + if (fstatfs(fd, &s) < 0) { + close_nointr_nofail(fd); + return -errno; + } + + if (!is_temporary_fs(&s)) { + log_error("Attempted to remove disk file system, and we can't allow that."); + close_nointr_nofail(fd); + return -EPERM; + } + } + r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL); if (delete_root) { if (honour_sticky && file_is_priv_sticky(path) > 0) @@ -3267,6 +2867,14 @@ int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky return r; } +int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { + return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false); +} + +int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { + return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true); +} + int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) { assert(path); @@ -3329,12 +2937,13 @@ cpu_set_t* cpu_set_malloc(unsigned *ncpus) { } } -void status_vprintf(const char *status, bool ellipse, const char *format, va_list ap) { - char *s = NULL; +int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) { static const char status_indent[] = " "; /* "[" STATUS "] " */ - int fd = -1; - struct iovec iovec[5]; + _cleanup_free_ char *s = NULL; + _cleanup_close_ int fd = -1; + struct iovec iovec[6] = {}; int n = 0; + static bool prev_ephemeral; assert(format); @@ -3342,11 +2951,11 @@ void status_vprintf(const char *status, bool ellipse, const char *format, va_lis * optional and go exclusively to the console. */ if (vasprintf(&s, format, ap) < 0) - goto finish; + return log_oom(); fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); if (fd < 0) - goto finish; + return fd; if (ellipse) { char *e; @@ -3357,7 +2966,7 @@ void status_vprintf(const char *status, bool ellipse, const char *format, va_lis if (c <= 0) c = 80; - sl = status ? strlen(status_indent) : 0; + sl = status ? sizeof(status_indent)-1 : 0; emax = c - sl - 1; if (emax < 3) @@ -3370,7 +2979,9 @@ void status_vprintf(const char *status, bool ellipse, const char *format, va_lis } } - zero(iovec); + if (prev_ephemeral) + IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE); + prev_ephemeral = ephemeral; if (status) { if (!isempty(status)) { @@ -3382,55 +2993,43 @@ void status_vprintf(const char *status, bool ellipse, const char *format, va_lis } IOVEC_SET_STRING(iovec[n++], s); - IOVEC_SET_STRING(iovec[n++], "\n"); - - writev(fd, iovec, n); + if (!ephemeral) + IOVEC_SET_STRING(iovec[n++], "\n"); -finish: - free(s); + if (writev(fd, iovec, n) < 0) + return -errno; - if (fd >= 0) - close_nointr_nofail(fd); + return 0; } -void status_printf(const char *status, bool ellipse, const char *format, ...) { +int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) { va_list ap; + int r; assert(format); va_start(ap, format); - status_vprintf(status, ellipse, format, ap); + r = status_vprintf(status, ellipse, ephemeral, format, ap); va_end(ap); + + return r; } -void status_welcome(void) { - char *pretty_name = NULL, *ansi_color = NULL; - const char *const_pretty = NULL, *const_color = NULL; +int status_welcome(void) { int r; + _cleanup_free_ char *pretty_name = NULL, *ansi_color = NULL; - if ((r = parse_env_file("/etc/os-release", NEWLINE, - "PRETTY_NAME", &pretty_name, - "ANSI_COLOR", &ansi_color, - NULL)) < 0) { - - if (r != -ENOENT) - log_warning("Failed to read /etc/os-release: %s", strerror(-r)); - } - - if (!pretty_name && !const_pretty) - const_pretty = "Linux"; + r = parse_env_file("/etc/os-release", NEWLINE, + "PRETTY_NAME", &pretty_name, + "ANSI_COLOR", &ansi_color, + NULL); + if (r < 0 && r != -ENOENT) + log_warning("Failed to read /etc/os-release: %s", strerror(-r)); - if (!ansi_color && !const_color) - const_color = "1"; - - status_printf(NULL, - false, - "\nWelcome to \x1B[%sm%s\x1B[0m!\n", - const_color ? const_color : ansi_color, - const_pretty ? const_pretty : pretty_name); - - free(ansi_color); - free(pretty_name); + return status_printf(NULL, false, false, + "\nWelcome to \x1B[%sm%s\x1B[0m!\n", + isempty(ansi_color) ? "1" : ansi_color, + isempty(pretty_name) ? "Linux" : pretty_name); } char *replace_env(const char *format, char **env) { @@ -3482,10 +3081,10 @@ char *replace_env(const char *format, char **env) { if (*e == '}') { const char *t; - if (!(t = strv_env_get_with_length(env, word+2, e-word-2))) - t = ""; + t = strempty(strv_env_get_n(env, word+2, e-word-2)); - if (!(k = strappend(r, t))) + k = strappend(r, t); + if (!k) goto fail; free(r); @@ -3526,7 +3125,8 @@ char **replace_env_argv(char **argv, char **env) { char **w, **m; unsigned q; - if ((e = strv_env_get(env, *i+1))) { + e = strv_env_get(env, *i+1); + if (e) { if (!(m = strv_split_quoted(e))) { r[k] = NULL; @@ -3568,8 +3168,7 @@ char **replace_env_argv(char **argv, char **env) { } int fd_columns(int fd) { - struct winsize ws; - zero(ws); + struct winsize ws = {}; if (ioctl(fd, TIOCGWINSZ, &ws) < 0) return -errno; @@ -3581,28 +3180,29 @@ int fd_columns(int fd) { } unsigned columns(void) { - static __thread int parsed_columns = 0; const char *e; + int c; - if (_likely_(parsed_columns > 0)) - return parsed_columns; + if (_likely_(cached_columns > 0)) + return cached_columns; + c = 0; e = getenv("COLUMNS"); if (e) - parsed_columns = atoi(e); + safe_atoi(e, &c); - if (parsed_columns <= 0) - parsed_columns = fd_columns(STDOUT_FILENO); + if (c <= 0) + c = fd_columns(STDOUT_FILENO); - if (parsed_columns <= 0) - parsed_columns = 80; + if (c <= 0) + c = 80; - return parsed_columns; + cached_columns = c; + return c; } int fd_lines(int fd) { - struct winsize ws; - zero(ws); + struct winsize ws = {}; if (ioctl(fd, TIOCGWINSZ, &ws) < 0) return -errno; @@ -3614,33 +3214,46 @@ int fd_lines(int fd) { } unsigned lines(void) { - static __thread int parsed_lines = 0; const char *e; + unsigned l; - if (_likely_(parsed_lines > 0)) - return parsed_lines; + if (_likely_(cached_lines > 0)) + return cached_lines; + l = 0; e = getenv("LINES"); if (e) - parsed_lines = atoi(e); + safe_atou(e, &l); - if (parsed_lines <= 0) - parsed_lines = fd_lines(STDOUT_FILENO); + if (l <= 0) + l = fd_lines(STDOUT_FILENO); - if (parsed_lines <= 0) - parsed_lines = 25; + if (l <= 0) + l = 24; - return parsed_lines; + cached_lines = l; + return cached_lines; } -int running_in_chroot(void) { - struct stat a, b; +/* intended to be used as a SIGWINCH sighandler */ +void columns_lines_cache_reset(int signum) { + cached_columns = 0; + cached_lines = 0; +} - zero(a); - zero(b); +bool on_tty(void) { + static int cached_on_tty = -1; - /* Only works as root */ + if (_unlikely_(cached_on_tty < 0)) + cached_on_tty = isatty(STDOUT_FILENO) > 0; + + return cached_on_tty; +} + +int running_in_chroot(void) { + struct stat a = {}, b = {}; + /* Only works as root */ if (stat("/proc/1/root", &a) < 0) return -errno; @@ -3665,7 +3278,7 @@ char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigne r = new0(char, new_length+1); if (!r) - return r; + return NULL; x = (new_length * percent) / 100; @@ -3692,7 +3305,12 @@ int touch(const char *path) { assert(path); - if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0) + /* This just opens the file for writing, ensuring it + * exists. It doesn't call utimensat() the way /usr/bin/touch + * does it. */ + + fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644); + if (fd < 0) return -errno; close_nointr_nofail(fd); @@ -3703,6 +3321,11 @@ char *unquote(const char *s, const char* quotes) { size_t l; assert(s); + /* This is rather stupid, simply removes the heading and + * trailing quotes if there is one. Doesn't care about + * escaping or anything. We should make this smarter one + * day...*/ + l = strlen(s); if (l < 2) return strdup(s); @@ -3714,39 +3337,40 @@ char *unquote(const char *s, const char* quotes) { } char *normalize_env_assignment(const char *s) { - char *name, *value, *p, *r; + _cleanup_free_ char *name = NULL, *value = NULL, *p = NULL; + char *eq, *r; - p = strchr(s, '='); + eq = strchr(s, '='); + if (!eq) { + char *t; - if (!p) { - if (!(r = strdup(s))) + r = strdup(s); + if (!r) return NULL; - return strstrip(r); + t = strstrip(r); + if (t == r) + return r; + + memmove(r, t, strlen(t) + 1); + return r; } - if (!(name = strndup(s, p - s))) + name = strndup(s, eq - s); + if (!name) return NULL; - if (!(p = strdup(p+1))) { - free(name); + p = strdup(eq + 1); + if (!p) return NULL; - } value = unquote(strstrip(p), QUOTES); - free(p); - - if (!value) { - free(name); + if (!value) return NULL; - } - if (asprintf(&r, "%s=%s", name, value) < 0) + if (asprintf(&r, "%s=%s", strstrip(name), value) < 0) r = NULL; - free(value); - free(name); - return r; } @@ -3780,7 +3404,8 @@ int wait_for_terminate_and_warn(const char *name, pid_t pid) { assert(name); assert(pid > 1); - if ((r = wait_for_terminate(pid, &status)) < 0) { + r = wait_for_terminate(pid, &status); + if (r < 0) { log_warning("Failed to wait for %s: %s", name, strerror(-r)); return r; } @@ -3803,7 +3428,6 @@ int wait_for_terminate_and_warn(const char *name, pid_t pid) { log_warning("%s failed due to unknown reason.", name); return -EPROTO; - } _noreturn_ void freeze(void) { @@ -3844,10 +3468,14 @@ DIR *xopendirat(int fd, const char *name, int flags) { int nfd; DIR *d; - if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0) + assert(!(flags & O_CREAT)); + + nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0); + if (nfd < 0) return NULL; - if (!(d = fdopendir(nfd))) { + d = fdopendir(nfd); + if (!d) { close_nointr_nofail(nfd); return NULL; } @@ -3859,88 +3487,51 @@ int signal_from_string_try_harder(const char *s) { int signo; assert(s); - if ((signo = signal_from_string(s)) <= 0) + signo = signal_from_string(s); + if (signo <= 0) if (startswith(s, "SIG")) return signal_from_string(s+3); return signo; } -void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) { +static char *tag_to_udev_node(const char *tagvalue, const char *by) { + _cleanup_free_ char *t = NULL, *u = NULL; + char *dn; + size_t enc_len; - assert(f); - assert(name); - assert(t); - - if (!dual_timestamp_is_set(t)) - return; + u = unquote(tagvalue, "\"\'"); + if (u == NULL) + return NULL; - fprintf(f, "%s=%llu %llu\n", - name, - (unsigned long long) t->realtime, - (unsigned long long) t->monotonic); -} + enc_len = strlen(u) * 4; + t = new(char, enc_len); + if (t == NULL) + return NULL; -void dual_timestamp_deserialize(const char *value, dual_timestamp *t) { - unsigned long long a, b; + if (udev_encode_string(u, t, enc_len) < 0) + return NULL; - assert(value); - assert(t); + if (asprintf(&dn, "/dev/disk/by-%s/%s", by, t) < 0) + return NULL; - if (sscanf(value, "%lli %llu", &a, &b) != 2) - log_debug("Failed to parse finish timestamp value %s", value); - else { - t->realtime = a; - t->monotonic = b; - } + return dn; } char *fstab_node_to_udev_node(const char *p) { - char *dn, *t, *u; - int r; - - /* FIXME: to follow udev's logic 100% we need to leave valid - * UTF8 chars unescaped */ - - if (startswith(p, "LABEL=")) { - - if (!(u = unquote(p+6, "\"\'"))) - return NULL; - - t = xescape(u, "/ "); - free(u); - - if (!t) - return NULL; - - r = asprintf(&dn, "/dev/disk/by-label/%s", t); - free(t); - - if (r < 0) - return NULL; - - return dn; - } - - if (startswith(p, "UUID=")) { - - if (!(u = unquote(p+5, "\"\'"))) - return NULL; - - t = xescape(u, "/ "); - free(u); + assert(p); - if (!t) - return NULL; + if (startswith(p, "LABEL=")) + return tag_to_udev_node(p+6, "label"); - r = asprintf(&dn, "/dev/disk/by-uuid/%s", t); - free(t); + if (startswith(p, "UUID=")) + return tag_to_udev_node(p+5, "uuid"); - if (r < 0) - return NULL; + if (startswith(p, "PARTUUID=")) + return tag_to_udev_node(p+9, "partuuid"); - return dn; - } + if (startswith(p, "PARTLABEL=")) + return tag_to_udev_node(p+10, "partlabel"); return strdup(p); } @@ -3987,6 +3578,29 @@ int vtnr_from_tty(const char *tty) { return i; } +char *resolve_dev_console(char **active) { + char *tty; + + /* Resolve where /dev/console is pointing to, if /sys is actually ours + * (i.e. not read-only-mounted which is a sign for container setups) */ + + if (path_is_read_only_fs("/sys") > 0) + return NULL; + + if (read_one_line_file("/sys/class/tty/console/active", active) < 0) + return NULL; + + /* If multiple log outputs are configured the last one is what + * /dev/console points to */ + tty = strrchr(*active, ' '); + if (tty) + tty++; + else + tty = *active; + + return tty; +} + bool tty_is_vc_resolve(const char *tty) { char *active = NULL; bool b; @@ -3996,19 +3610,11 @@ bool tty_is_vc_resolve(const char *tty) { if (startswith(tty, "/dev/")) tty += 5; - /* Resolve where /dev/console is pointing to, if /sys is - * actually ours (i.e. not read-only-mounted which is a sign - * for container setups) */ - if (streq(tty, "console") && path_is_read_only_fs("/sys") <= 0) - if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { - /* If multiple log outputs are configured the - * last one is what /dev/console points to */ - tty = strrchr(active, ' '); - if (tty) - tty++; - else - tty = active; - } + if (streq(tty, "console")) { + tty = resolve_dev_console(&active); + if (!tty) + return false; + } b = tty_is_vc(tty); free(active); @@ -4039,7 +3645,12 @@ bool dirent_is_file(const struct dirent *de) { bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) { assert(de); - if (!dirent_is_file(de)) + if (de->d_type != DT_REG && + de->d_type != DT_LNK && + de->d_type != DT_UNKNOWN) + return false; + + if (ignore_file_allow_backup(de->d_name)) return false; return endswith(de->d_name, suffix); @@ -4052,8 +3663,8 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) { assert(directory); - /* Executes all binaries in a directory in parallel and waits - * until all they all finished. */ + /* Executes all binaries in a directory in parallel and + * waits for them to finish. */ if (!d) { if (!(_d = opendir(directory))) { @@ -4082,7 +3693,7 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) { continue; if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) { - log_error("Out of memory"); + log_oom(); continue; } @@ -4119,10 +3730,9 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) { while (!hashmap_isempty(pids)) { pid_t pid = PTR_TO_UINT(hashmap_first_key(pids)); - siginfo_t si; + siginfo_t si = {}; char *path; - zero(si); if (waitid(P_PID, pid, &si, WEXITED) < 0) { if (errno == EINTR) @@ -4133,7 +3743,7 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) { } if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) { - if (!is_clean_exit(si.si_code, si.si_status)) { + if (!is_clean_exit(si.si_code, si.si_status, NULL)) { if (si.si_code == CLD_EXITED) log_error("%s exited with exit status %i.", path, si.si_status); else @@ -4181,194 +3791,89 @@ bool plymouth_running(void) { return access("/run/plymouth/pid", F_OK) >= 0; } -void parse_syslog_priority(char **p, int *priority) { - int a = 0, b = 0, c = 0; - int k; - - assert(p); - assert(*p); - assert(priority); - - if ((*p)[0] != '<') - return; - - if (!strchr(*p, '>')) - return; +char* strshorten(char *s, size_t l) { + assert(s); - if ((*p)[2] == '>') { - c = undecchar((*p)[1]); - k = 3; - } else if ((*p)[3] == '>') { - b = undecchar((*p)[1]); - c = undecchar((*p)[2]); - k = 4; - } else if ((*p)[4] == '>') { - a = undecchar((*p)[1]); - b = undecchar((*p)[2]); - c = undecchar((*p)[3]); - k = 5; - } else - return; + if (l < strlen(s)) + s[l] = 0; - if (a < 0 || b < 0 || c < 0) - return; + return s; +} - *priority = a*100+b*10+c; - *p += k; +static bool hostname_valid_char(char c) { + return + (c >= 'a' && c <= 'z') || + (c >= 'A' && c <= 'Z') || + (c >= '0' && c <= '9') || + c == '-' || + c == '_' || + c == '.'; } -void skip_syslog_pid(char **buf) { - char *p; +bool hostname_is_valid(const char *s) { + const char *p; + bool dot; - assert(buf); - assert(*buf); + if (isempty(s)) + return false; - p = *buf; + for (p = s, dot = true; *p; p++) { + if (*p == '.') { + if (dot) + return false; - if (*p != '[') - return; + dot = true; + } else { + if (!hostname_valid_char(*p)) + return false; - p++; - p += strspn(p, "0123456789"); + dot = false; + } + } - if (*p != ']') - return; + if (dot) + return false; - p++; + if (p-s > HOST_NAME_MAX) + return false; - *buf = p; + return true; } -void skip_syslog_date(char **buf) { - enum { - LETTER, - SPACE, - NUMBER, - SPACE_OR_NUMBER, - COLON - } sequence[] = { - LETTER, LETTER, LETTER, - SPACE, - SPACE_OR_NUMBER, NUMBER, - SPACE, - SPACE_OR_NUMBER, NUMBER, - COLON, - SPACE_OR_NUMBER, NUMBER, - COLON, - SPACE_OR_NUMBER, NUMBER, - SPACE - }; +char* hostname_cleanup(char *s, bool lowercase) { + char *p, *d; + bool dot; - char *p; - unsigned i; + for (p = s, d = s, dot = true; *p; p++) { + if (*p == '.') { + if (dot) + continue; - assert(buf); - assert(*buf); + *(d++) = '.'; + dot = true; + } else if (hostname_valid_char(*p)) { + *(d++) = lowercase ? tolower(*p) : *p; + dot = false; + } - p = *buf; + } - for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { + if (dot && d > s) + d[-1] = 0; + else + *d = 0; - if (!*p) - return; + strshorten(s, HOST_NAME_MAX); - switch (sequence[i]) { + return s; +} - case SPACE: - if (*p != ' ') - return; - break; - - case SPACE_OR_NUMBER: - if (*p == ' ') - break; - - /* fall through */ - - case NUMBER: - if (*p < '0' || *p > '9') - return; - - break; - - case LETTER: - if (!(*p >= 'A' && *p <= 'Z') && - !(*p >= 'a' && *p <= 'z')) - return; - - break; - - case COLON: - if (*p != ':') - return; - break; - - } - } - - *buf = p; -} - -char* strshorten(char *s, size_t l) { - assert(s); - - if (l < strlen(s)) - s[l] = 0; - - return s; -} - -static bool hostname_valid_char(char c) { - return - (c >= 'a' && c <= 'z') || - (c >= 'A' && c <= 'Z') || - (c >= '0' && c <= '9') || - c == '-' || - c == '_' || - c == '.'; -} - -bool hostname_is_valid(const char *s) { - const char *p; - - if (isempty(s)) - return false; - - for (p = s; *p; p++) - if (!hostname_valid_char(*p)) - return false; - - if (p-s > HOST_NAME_MAX) - return false; - - return true; -} - -char* hostname_cleanup(char *s) { - char *p, *d; - - for (p = s, d = s; *p; p++) - if ((*p >= 'a' && *p <= 'z') || - (*p >= 'A' && *p <= 'Z') || - (*p >= '0' && *p <= '9') || - *p == '-' || - *p == '_' || - *p == '.') - *(d++) = *p; - - *d = 0; - - strshorten(s, HOST_NAME_MAX); - return s; -} - -int pipe_eof(int fd) { - struct pollfd pollfd; - int r; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN|POLLHUP; +int pipe_eof(int fd) { + int r; + struct pollfd pollfd = { + .fd = fd, + .events = POLLIN|POLLHUP, + }; r = poll(&pollfd, 1, 0); if (r < 0) @@ -4381,12 +3886,11 @@ int pipe_eof(int fd) { } int fd_wait_for_event(int fd, int event, usec_t t) { - struct pollfd pollfd; int r; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = event; + struct pollfd pollfd = { + .fd = fd, + .events = event, + }; r = poll(&pollfd, 1, t == (usec_t) -1 ? -1 : (int) (t / USEC_PER_MSEC)); if (r < 0) @@ -4587,49 +4091,9 @@ int copy_file(const char *from, const char *to) { return 0; } -int symlink_or_copy(const char *from, const char *to) { - char *pf = NULL, *pt = NULL; - struct stat a, b; - int r; - - assert(from); - assert(to); - - if (path_get_parent(from, &pf) < 0 || - path_get_parent(to, &pt) < 0) { - r = -ENOMEM; - goto finish; - } - - if (stat(pf, &a) < 0 || - stat(pt, &b) < 0) { - r = -errno; - goto finish; - } - - if (a.st_dev != b.st_dev) { - free(pf); - free(pt); - - return copy_file(from, to); - } - - if (symlink(from, to) < 0) { - r = -errno; - goto finish; - } - - r = 0; - -finish: - free(pf); - free(pt); - - return r; -} - -int symlink_or_copy_atomic(const char *from, const char *to) { - char *t, *x; +int symlink_atomic(const char *from, const char *to) { + char *x; + _cleanup_free_ char *t; const char *fn; size_t k; unsigned long long ull; @@ -4657,22 +4121,16 @@ int symlink_or_copy_atomic(const char *from, const char *to) { *x = 0; - r = symlink_or_copy(from, t); - if (r < 0) { - unlink(t); - free(t); - return r; - } + if (symlink(from, t) < 0) + return -errno; if (rename(t, to) < 0) { r = -errno; unlink(t); - free(t); return r; } - free(t); - return r; + return 0; } bool display_is_local(const char *display) { @@ -4709,7 +4167,12 @@ int socket_from_display(const char *display, char **path) { return 0; } -int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) { +int get_user_creds( + const char **username, + uid_t *uid, gid_t *gid, + const char **home, + const char **shell) { + struct passwd *p; uid_t u; @@ -4730,6 +4193,10 @@ int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **h if (home) *home = "/root"; + + if (shell) + *shell = "/bin/sh"; + return 0; } @@ -4750,7 +4217,7 @@ int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **h } if (!p) - return errno != 0 ? -errno : -ESRCH; + return errno > 0 ? -errno : -ESRCH; if (uid) *uid = p->pw_uid; @@ -4761,9 +4228,46 @@ int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **h if (home) *home = p->pw_dir; + if (shell) + *shell = p->pw_shell; + return 0; } +char* uid_to_name(uid_t uid) { + struct passwd *p; + char *r; + + if (uid == 0) + return strdup("root"); + + p = getpwuid(uid); + if (p) + return strdup(p->pw_name); + + if (asprintf(&r, "%lu", (unsigned long) uid) < 0) + return NULL; + + return r; +} + +char* gid_to_name(gid_t gid) { + struct group *p; + char *r; + + if (gid == 0) + return strdup("root"); + + p = getgrgid(gid); + if (p) + return strdup(p->gr_name); + + if (asprintf(&r, "%lu", (unsigned long) gid) < 0) + return NULL; + + return r; +} + int get_group_creds(const char **groupname, gid_t *gid) { struct group *g; gid_t id; @@ -4794,7 +4298,7 @@ int get_group_creds(const char **groupname, gid_t *gid) { } if (!g) - return errno != 0 ? -errno : -ESRCH; + return errno > 0 ? -errno : -ESRCH; if (gid) *gid = g->gr_gid; @@ -4802,14 +4306,10 @@ int get_group_creds(const char **groupname, gid_t *gid) { return 0; } -int in_group(const char *name) { - gid_t gid, *gids; +int in_gid(gid_t gid) { + gid_t *gids; int ngroups_max, r, i; - r = get_group_creds(&name, &gid); - if (r < 0) - return r; - if (getgid() == gid) return 1; @@ -4832,28 +4332,58 @@ int in_group(const char *name) { return 0; } +int in_group(const char *name) { + int r; + gid_t gid; + + r = get_group_creds(&name, &gid); + if (r < 0) + return r; + + return in_gid(gid); +} + int glob_exists(const char *path) { - glob_t g; - int r, k; + _cleanup_globfree_ glob_t g = {}; + int k; assert(path); - zero(g); errno = 0; k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g); if (k == GLOB_NOMATCH) - r = 0; + return 0; else if (k == GLOB_NOSPACE) - r = -ENOMEM; + return -ENOMEM; else if (k == 0) - r = !strv_isempty(g.gl_pathv); + return !strv_isempty(g.gl_pathv); else - r = errno ? -errno : -EIO; + return errno ? -errno : -EIO; +} - globfree(&g); +int glob_extend(char ***strv, const char *path) { + _cleanup_globfree_ glob_t g = {}; + int k; + char **p; - return r; + errno = 0; + k = glob(optarg, GLOB_NOSORT|GLOB_BRACE, NULL, &g); + + if (k == GLOB_NOMATCH) + return -ENOENT; + else if (k == GLOB_NOSPACE) + return -ENOMEM; + else if (k != 0 || strv_isempty(g.gl_pathv)) + return errno ? -errno : -EIO; + + STRV_FOREACH(p, g.gl_pathv) { + k = strv_extend(strv, *p); + if (k < 0) + break; + } + + return k; } int dirent_ensure_type(DIR *d, struct dirent *de) { @@ -4920,10 +4450,11 @@ int get_files_in_directory(const char *path, char ***list) { return -errno; for (;;) { - struct dirent buffer, *de; + struct dirent *de; + union dirent_storage buf; int k; - k = readdir_r(d, &buffer, &de); + k = readdir_r(d, &buf.de, &de); if (k != 0) { r = -k; goto finish; @@ -4977,7 +4508,7 @@ finish: return r; } -char *join(const char *x, ...) { +char *strjoin(const char *x, ...) { va_list ap; size_t l; char *r, *p; @@ -4989,12 +4520,19 @@ char *join(const char *x, ...) { for (;;) { const char *t; + size_t n; t = va_arg(ap, const char *); if (!t) break; - l += strlen(t); + n = strlen(t); + if (n > ((size_t) -1) - l) { + va_end(ap); + return NULL; + } + + l += n; } } else l = 0; @@ -5116,7 +4654,7 @@ static const char *const ioprio_class_table[] = { [IOPRIO_CLASS_IDLE] = "idle" }; -DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int); +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX); static const char *const sigchld_code_table[] = { [CLD_EXITED] = "exited", @@ -5152,7 +4690,7 @@ static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = { [LOG_FAC(LOG_LOCAL7)] = "local7" }; -DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int); +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0)); static const char *const log_level_table[] = { [LOG_EMERG] = "emerg", @@ -5165,7 +4703,7 @@ static const char *const log_level_table[] = { [LOG_DEBUG] = "debug" }; -DEFINE_STRING_TABLE_LOOKUP(log_level, int); +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG); static const char* const sched_policy_table[] = { [SCHED_OTHER] = "other", @@ -5175,7 +4713,7 @@ static const char* const sched_policy_table[] = { [SCHED_RR] = "rr" }; -DEFINE_STRING_TABLE_LOOKUP(sched_policy, int); +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX); static const char* const rlimit_table[] = { [RLIMIT_CPU] = "LimitCPU", @@ -5205,7 +4743,7 @@ static const char* const ip_tos_table[] = { [IPTOS_LOWCOST] = "low-cost", }; -DEFINE_STRING_TABLE_LOOKUP(ip_tos, int); +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); static const char *const __signal_table[] = { [SIGHUP] = "HUP", @@ -5246,7 +4784,7 @@ static const char *const __signal_table[] = { DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); const char *signal_to_string(int signo) { - static __thread char buf[12]; + static __thread char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1]; const char *name; name = __signal_to_string(signo); @@ -5254,10 +4792,10 @@ const char *signal_to_string(int signo) { return name; if (signo >= SIGRTMIN && signo <= SIGRTMAX) - snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN); + snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN); else - snprintf(buf, sizeof(buf) - 1, "%d", signo); - char_array_0(buf); + snprintf(buf, sizeof(buf), "%d", signo); + return buf; } @@ -5266,7 +4804,7 @@ int signal_from_string(const char *s) { int offset = 0; unsigned u; - signo =__signal_from_string(s); + signo = __signal_from_string(s); if (signo > 0) return signo; @@ -5525,20 +5063,21 @@ int setrlimit_closest(int resource, const struct rlimit *rlim) { } int getenv_for_pid(pid_t pid, const char *field, char **_value) { - char path[sizeof("/proc/")-1+10+sizeof("/environ")], *value = NULL; + _cleanup_fclose_ FILE *f = NULL; + char *value = NULL; int r; - FILE *f; bool done = false; size_t l; + const char *path; + assert(pid >= 0); assert(field); assert(_value); if (pid == 0) - pid = getpid(); - - snprintf(path, sizeof(path), "/proc/%lu/environ", (unsigned long) pid); - char_array_0(path); + path = "/proc/self/environ"; + else + path = procfs_file_alloca(pid, "environ"); f = fopen(path, "re"); if (!f) @@ -5567,10 +5106,8 @@ int getenv_for_pid(pid_t pid, const char *field, char **_value) { if (memcmp(line, field, l) == 0 && line[l] == '=') { value = strdup(line + l + 1); - if (!value) { - r = -ENOMEM; - break; - } + if (!value) + return -ENOMEM; r = 1; break; @@ -5578,35 +5115,812 @@ int getenv_for_pid(pid_t pid, const char *field, char **_value) { } while (!done); - fclose(f); + *_value = value; + return r; +} - if (r >= 0) - *_value = value; +bool is_valid_documentation_url(const char *url) { + assert(url); - return r; + if (startswith(url, "http://") && url[7]) + return true; + + if (startswith(url, "https://") && url[8]) + return true; + + if (startswith(url, "file:") && url[5]) + return true; + + if (startswith(url, "info:") && url[5]) + return true; + + if (startswith(url, "man:") && url[4]) + return true; + + return false; } -int can_sleep(const char *type) { - char *p, *w, *state; - size_t l, k; - bool found = false; - int r; +bool in_initrd(void) { + static __thread int saved = -1; + struct statfs s; - assert(type); + if (saved >= 0) + return saved; - r = read_one_line_file("/sys/power/state", &p); - if (r < 0) - return r == -ENOENT ? 0 : r; + /* We make two checks here: + * + * 1. the flag file /etc/initrd-release must exist + * 2. the root file system must be a memory file system + * + * The second check is extra paranoia, since misdetecting an + * initrd can have bad bad consequences due the initrd + * emptying when transititioning to the main systemd. + */ - k = strlen(type); + saved = access("/etc/initrd-release", F_OK) >= 0 && + statfs("/", &s) >= 0 && + is_temporary_fs(&s); - FOREACH_WORD_SEPARATOR(w, l, p, WHITESPACE, state) { - if (l == k && strncmp(w, type, l) == 0) { - found = true; - break; - } + return saved; +} + +void warn_melody(void) { + _cleanup_close_ int fd = -1; + + fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY); + if (fd < 0) + return; + + /* Yeah, this is synchronous. Kinda sucks. But well... */ + + ioctl(fd, KIOCSOUND, (int)(1193180/440)); + usleep(125*USEC_PER_MSEC); + + ioctl(fd, KIOCSOUND, (int)(1193180/220)); + usleep(125*USEC_PER_MSEC); + + ioctl(fd, KIOCSOUND, (int)(1193180/220)); + usleep(125*USEC_PER_MSEC); + + ioctl(fd, KIOCSOUND, 0); +} + +int make_console_stdio(void) { + int fd, r; + + /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ + + fd = acquire_terminal("/dev/console", false, true, true, (usec_t) -1); + if (fd < 0) { + log_error("Failed to acquire terminal: %s", strerror(-fd)); + return fd; } - free(p); - return found; + r = make_stdio(fd); + if (r < 0) { + log_error("Failed to duplicate terminal fd: %s", strerror(-r)); + return r; + } + + return 0; +} + +int get_home_dir(char **_h) { + char *h; + const char *e; + uid_t u; + struct passwd *p; + + assert(_h); + + /* Take the user specified one */ + e = getenv("HOME"); + if (e) { + h = strdup(e); + if (!h) + return -ENOMEM; + + *_h = h; + return 0; + } + + /* Hardcode home directory for root to avoid NSS */ + u = getuid(); + if (u == 0) { + h = strdup("/root"); + if (!h) + return -ENOMEM; + + *_h = h; + return 0; + } + + /* Check the database... */ + errno = 0; + p = getpwuid(u); + if (!p) + return errno > 0 ? -errno : -ESRCH; + + if (!path_is_absolute(p->pw_dir)) + return -EINVAL; + + h = strdup(p->pw_dir); + if (!h) + return -ENOMEM; + + *_h = h; + return 0; +} + +bool filename_is_safe(const char *p) { + + if (isempty(p)) + return false; + + if (strchr(p, '/')) + return false; + + if (streq(p, ".")) + return false; + + if (streq(p, "..")) + return false; + + if (strlen(p) > FILENAME_MAX) + return false; + + return true; +} + +bool string_is_safe(const char *p) { + const char *t; + + assert(p); + + for (t = p; *t; t++) { + if (*t > 0 && *t < ' ') + return false; + + if (strchr("\\\"\'", *t)) + return false; + } + + return true; +} + +/** + * Check if a string contains control characters. + * Spaces and tabs are not considered control characters. + */ +bool string_has_cc(const char *p) { + const char *t; + + assert(p); + + for (t = p; *t; t++) + if (*t > 0 && *t < ' ' && *t != '\t') + return true; + + return false; +} + +bool path_is_safe(const char *p) { + + if (isempty(p)) + return false; + + if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) + return false; + + if (strlen(p) > PATH_MAX) + return false; + + /* The following two checks are not really dangerous, but hey, they still are confusing */ + if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) + return false; + + if (strstr(p, "//")) + return false; + + return true; +} + +/* hey glibc, APIs with callbacks without a user pointer are so useless */ +void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size, + int (*compar) (const void *, const void *, void *), void *arg) { + size_t l, u, idx; + const void *p; + int comparison; + + l = 0; + u = nmemb; + while (l < u) { + idx = (l + u) / 2; + p = (void *)(((const char *) base) + (idx * size)); + comparison = compar(key, p, arg); + if (comparison < 0) + u = idx; + else if (comparison > 0) + l = idx + 1; + else + return (void *)p; + } + return NULL; +} + +bool is_locale_utf8(void) { + const char *set; + static int cached_answer = -1; + + if (cached_answer >= 0) + goto out; + + if (!setlocale(LC_ALL, "")) { + cached_answer = true; + goto out; + } + + set = nl_langinfo(CODESET); + if (!set) { + cached_answer = true; + goto out; + } + + if(streq(set, "UTF-8")) { + cached_answer = true; + goto out; + } + + /* For LC_CTYPE=="C" return true, because CTYPE is effectly + * unset and everything can do to UTF-8 nowadays. */ + set = setlocale(LC_CTYPE, NULL); + if (!set) { + cached_answer = true; + goto out; + } + + /* Check result, but ignore the result if C was set + * explicitly. */ + cached_answer = + streq(set, "C") && + !getenv("LC_ALL") && + !getenv("LC_CTYPE") && + !getenv("LANG"); + +out: + return (bool) cached_answer; +} + +const char *draw_special_char(DrawSpecialChar ch) { + static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = { + /* UTF-8 */ { + [DRAW_TREE_VERT] = "\342\224\202 ", /* │ */ + [DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */ + [DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */ + [DRAW_TREE_SPACE] = " ", /* */ + [DRAW_TRIANGULAR_BULLET] = "\342\200\243 ", /* ‣ */ + }, + /* ASCII fallback */ { + [DRAW_TREE_VERT] = "| ", + [DRAW_TREE_BRANCH] = "|-", + [DRAW_TREE_RIGHT] = "`-", + [DRAW_TREE_SPACE] = " ", + [DRAW_TRIANGULAR_BULLET] = "> ", + } + }; + + return draw_table[!is_locale_utf8()][ch]; +} + +char *strreplace(const char *text, const char *old_string, const char *new_string) { + const char *f; + char *t, *r; + size_t l, old_len, new_len; + + assert(text); + assert(old_string); + assert(new_string); + + old_len = strlen(old_string); + new_len = strlen(new_string); + + l = strlen(text); + r = new(char, l+1); + if (!r) + return NULL; + + f = text; + t = r; + while (*f) { + char *a; + size_t d, nl; + + if (!startswith(f, old_string)) { + *(t++) = *(f++); + continue; + } + + d = t - r; + nl = l - old_len + new_len; + a = realloc(r, nl + 1); + if (!a) + goto oom; + + l = nl; + r = a; + t = r + d; + + t = stpcpy(t, new_string); + f += old_len; + } + + *t = 0; + return r; + +oom: + free(r); + return NULL; +} + +char *strip_tab_ansi(char **ibuf, size_t *_isz) { + const char *i, *begin = NULL; + enum { + STATE_OTHER, + STATE_ESCAPE, + STATE_BRACKET + } state = STATE_OTHER; + char *obuf = NULL; + size_t osz = 0, isz; + FILE *f; + + assert(ibuf); + assert(*ibuf); + + /* Strips ANSI color and replaces TABs by 8 spaces */ + + isz = _isz ? *_isz : strlen(*ibuf); + + f = open_memstream(&obuf, &osz); + if (!f) + return NULL; + + for (i = *ibuf; i < *ibuf + isz + 1; i++) { + + switch (state) { + + case STATE_OTHER: + if (i >= *ibuf + isz) /* EOT */ + break; + else if (*i == '\x1B') + state = STATE_ESCAPE; + else if (*i == '\t') + fputs(" ", f); + else + fputc(*i, f); + break; + + case STATE_ESCAPE: + if (i >= *ibuf + isz) { /* EOT */ + fputc('\x1B', f); + break; + } else if (*i == '[') { + state = STATE_BRACKET; + begin = i + 1; + } else { + fputc('\x1B', f); + fputc(*i, f); + state = STATE_OTHER; + } + + break; + + case STATE_BRACKET: + + if (i >= *ibuf + isz || /* EOT */ + (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) { + fputc('\x1B', f); + fputc('[', f); + state = STATE_OTHER; + i = begin-1; + } else if (*i == 'm') + state = STATE_OTHER; + break; + } + } + + if (ferror(f)) { + fclose(f); + free(obuf); + return NULL; + } + + fclose(f); + + free(*ibuf); + *ibuf = obuf; + + if (_isz) + *_isz = osz; + + return obuf; +} + +int on_ac_power(void) { + bool found_offline = false, found_online = false; + _cleanup_closedir_ DIR *d = NULL; + + d = opendir("/sys/class/power_supply"); + if (!d) + return -errno; + + for (;;) { + struct dirent *de; + union dirent_storage buf; + _cleanup_close_ int fd = -1, device = -1; + char contents[6]; + ssize_t n; + int k; + + k = readdir_r(d, &buf.de, &de); + if (k != 0) + return -k; + + if (!de) + break; + + if (ignore_file(de->d_name)) + continue; + + device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY); + if (device < 0) { + if (errno == ENOENT || errno == ENOTDIR) + continue; + + return -errno; + } + + fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY); + if (fd < 0) { + if (errno == ENOENT) + continue; + + return -errno; + } + + n = read(fd, contents, sizeof(contents)); + if (n < 0) + return -errno; + + if (n != 6 || memcmp(contents, "Mains\n", 6)) + continue; + + close_nointr_nofail(fd); + fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY); + if (fd < 0) { + if (errno == ENOENT) + continue; + + return -errno; + } + + n = read(fd, contents, sizeof(contents)); + if (n < 0) + return -errno; + + if (n != 2 || contents[1] != '\n') + return -EIO; + + if (contents[0] == '1') { + found_online = true; + break; + } else if (contents[0] == '0') + found_offline = true; + else + return -EIO; + } + + return found_online || !found_offline; +} + +static int search_and_fopen_internal(const char *path, const char *mode, char **search, FILE **_f) { + char **i; + + assert(path); + assert(mode); + assert(_f); + + if (!path_strv_canonicalize_uniq(search)) + return -ENOMEM; + + STRV_FOREACH(i, search) { + _cleanup_free_ char *p = NULL; + FILE *f; + + p = strjoin(*i, "/", path, NULL); + if (!p) + return -ENOMEM; + + f = fopen(p, mode); + if (f) { + *_f = f; + return 0; + } + + if (errno != ENOENT) + return -errno; + } + + return -ENOENT; +} + +int search_and_fopen(const char *path, const char *mode, const char **search, FILE **_f) { + _cleanup_strv_free_ char **copy = NULL; + + assert(path); + assert(mode); + assert(_f); + + if (path_is_absolute(path)) { + FILE *f; + + f = fopen(path, mode); + if (f) { + *_f = f; + return 0; + } + + return -errno; + } + + copy = strv_copy((char**) search); + if (!copy) + return -ENOMEM; + + return search_and_fopen_internal(path, mode, copy, _f); +} + +int search_and_fopen_nulstr(const char *path, const char *mode, const char *search, FILE **_f) { + _cleanup_strv_free_ char **s = NULL; + + if (path_is_absolute(path)) { + FILE *f; + + f = fopen(path, mode); + if (f) { + *_f = f; + return 0; + } + + return -errno; + } + + s = strv_split_nulstr(search); + if (!s) + return -ENOMEM; + + return search_and_fopen_internal(path, mode, s, _f); +} + +int create_tmp_dir(char template[], char** dir_name) { + int r = 0; + char *d = NULL, *dt; + + assert(dir_name); + + RUN_WITH_UMASK(0077) { + d = mkdtemp(template); + } + if (!d) { + log_error("Can't create directory %s: %m", template); + return -errno; + } + + dt = strjoin(d, "/tmp", NULL); + if (!dt) { + r = log_oom(); + goto fail3; + } + + RUN_WITH_UMASK(0000) { + r = mkdir(dt, 0777); + } + if (r < 0) { + log_error("Can't create directory %s: %m", dt); + r = -errno; + goto fail2; + } + log_debug("Created temporary directory %s", dt); + + r = chmod(dt, 0777 | S_ISVTX); + if (r < 0) { + log_error("Failed to chmod %s: %m", dt); + r = -errno; + goto fail1; + } + log_debug("Set sticky bit on %s", dt); + + *dir_name = dt; + + return 0; +fail1: + rmdir(dt); +fail2: + free(dt); +fail3: + rmdir(template); + return r; +} + +char *strextend(char **x, ...) { + va_list ap; + size_t f, l; + char *r, *p; + + assert(x); + + l = f = *x ? strlen(*x) : 0; + + va_start(ap, x); + for (;;) { + const char *t; + size_t n; + + t = va_arg(ap, const char *); + if (!t) + break; + + n = strlen(t); + if (n > ((size_t) -1) - l) { + va_end(ap); + return NULL; + } + + l += n; + } + va_end(ap); + + r = realloc(*x, l+1); + if (!r) + return NULL; + + p = r + f; + + va_start(ap, x); + for (;;) { + const char *t; + + t = va_arg(ap, const char *); + if (!t) + break; + + p = stpcpy(p, t); + } + va_end(ap); + + *p = 0; + *x = r; + + return r + l; +} + +char *strrep(const char *s, unsigned n) { + size_t l; + char *r, *p; + unsigned i; + + assert(s); + + l = strlen(s); + p = r = malloc(l * n + 1); + if (!r) + return NULL; + + for (i = 0; i < n; i++) + p = stpcpy(p, s); + + *p = 0; + return r; +} + +void* greedy_realloc(void **p, size_t *allocated, size_t need) { + size_t a; + void *q; + + if (*allocated >= need) + return *p; + + a = MAX(64u, need * 2); + q = realloc(*p, a); + if (!q) + return NULL; + + *p = q; + *allocated = a; + return q; +} + +bool id128_is_valid(const char *s) { + size_t i, l; + + l = strlen(s); + if (l == 32) { + + /* Simple formatted 128bit hex string */ + + for (i = 0; i < l; i++) { + char c = s[i]; + + if (!(c >= '0' && c <= '9') && + !(c >= 'a' && c <= 'z') && + !(c >= 'A' && c <= 'Z')) + return false; + } + + } else if (l == 36) { + + /* Formatted UUID */ + + for (i = 0; i < l; i++) { + char c = s[i]; + + if ((i == 8 || i == 13 || i == 18 || i == 23)) { + if (c != '-') + return false; + } else { + if (!(c >= '0' && c <= '9') && + !(c >= 'a' && c <= 'z') && + !(c >= 'A' && c <= 'Z')) + return false; + } + } + + } else + return false; + + return true; +} + +void parse_user_at_host(char *arg, char **user, char **host) { + assert(arg); + assert(user); + assert(host); + + *host = strchr(arg, '@'); + if (*host == NULL) + *host = arg; + else { + *host[0]++ = '\0'; + *user = arg; + } +} + +int split_pair(const char *s, const char *sep, char **l, char **r) { + char *x, *a, *b; + + assert(s); + assert(sep); + assert(l); + assert(r); + + if (isempty(sep)) + return -EINVAL; + + x = strstr(s, sep); + if (!x) + return -EINVAL; + + a = strndup(s, x - s); + if (!a) + return -ENOMEM; + + b = strdup(x + strlen(sep)); + if (!b) { + free(a); + return -ENOMEM; + } + + *l = a; + *r = b; + + return 0; }