X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=97ff320bc8320c82b3d2f44b72f08dfe31eea4f7;hp=ee95a4b6f71c67bb7ff3f5c3e8ce736bfaa98113;hb=5f8cc96a0301c1177b11dd2e89370ef0b2ef577b;hpb=c4e34a612c81266773cf8358cb38a43d2e43474e

diff --git a/src/shared/util.c b/src/shared/util.c
index ee95a4b6f..97ff320bc 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -521,7 +521,7 @@ int safe_atod(const char *s, double *ret_d) {
 
 static size_t strcspn_escaped(const char *s, const char *reject) {
         bool escaped = false;
-        size_t n;
+        int n;
 
         for (n=0; s[n]; n++) {
                 if (escaped)
@@ -531,6 +531,7 @@ static size_t strcspn_escaped(const char *s, const char *reject) {
                 else if (strchr(reject, s[n]))
                         break;
         }
+
         /* if s ends in \, return index of previous char */
         return n - escaped;
 }
@@ -566,6 +567,11 @@ const char* split(const char **state, size_t *l, const char *separator, bool quo
                 *state = current++ + *l + 2;
         } else if (quoted) {
                 *l = strcspn_escaped(current, separator);
+                if (current[*l] && !strchr(separator, current[*l])) {
+                        /* unfinished escape */
+                        *state = current;
+                        return NULL;
+                }
                 *state = current + *l;
         } else {
                 *l = strcspn(current, separator);
@@ -1504,7 +1510,7 @@ char *ascii_strlower(char *t) {
         return t;
 }
 
-_pure_ static bool ignore_file_allow_backup(const char *filename) {
+_pure_ static bool hidden_file_allow_backup(const char *filename) {
         assert(filename);
 
         return
@@ -1521,13 +1527,13 @@ _pure_ static bool ignore_file_allow_backup(const char *filename) {
                 endswith(filename, ".swp");
 }
 
-bool ignore_file(const char *filename) {
+bool hidden_file(const char *filename) {
         assert(filename);
 
         if (endswith(filename, "~"))
                 return true;
 
-        return ignore_file_allow_backup(filename);
+        return hidden_file_allow_backup(filename);
 }
 
 int fd_nonblock(int fd, bool nonblock) {
@@ -1621,7 +1627,7 @@ int close_all_fds(const int except[], unsigned n_except) {
         while ((de = readdir(d))) {
                 int fd = -1;
 
-                if (ignore_file(de->d_name))
+                if (hidden_file(de->d_name))
                         continue;
 
                 if (safe_atoi(de->d_name, &fd) < 0)
@@ -2468,9 +2474,9 @@ int make_stdio(int fd) {
 
         assert(fd >= 0);
 
-        r = dup3(fd, STDIN_FILENO, 0);
-        s = dup3(fd, STDOUT_FILENO, 0);
-        t = dup3(fd, STDERR_FILENO, 0);
+        r = dup2(fd, STDIN_FILENO);
+        s = dup2(fd, STDOUT_FILENO);
+        t = dup2(fd, STDERR_FILENO);
 
         if (fd >= 3)
                 safe_close(fd);
@@ -2478,7 +2484,11 @@ int make_stdio(int fd) {
         if (r < 0 || s < 0 || t < 0)
                 return -errno;
 
-        /* We rely here that the new fd has O_CLOEXEC not set */
+        /* Explicitly unset O_CLOEXEC, since if fd was < 3, then
+         * dup2() was a NOP and the bit hence possibly set. */
+        fd_cloexec(STDIN_FILENO, false);
+        fd_cloexec(STDOUT_FILENO, false);
+        fd_cloexec(STDERR_FILENO, false);
 
         return 0;
 }
@@ -2521,7 +2531,7 @@ int dir_is_empty(const char *path) {
                 if (!de)
                         return 1;
 
-                if (!ignore_file(de->d_name))
+                if (!hidden_file(de->d_name))
                         return 0;
         }
 }
@@ -2775,23 +2785,36 @@ char *getusername_malloc(void) {
         return lookup_uid(getuid());
 }
 
-int getttyname_malloc(int fd, char **r) {
-        char path[PATH_MAX], *c;
-        int k;
+int getttyname_malloc(int fd, char **ret) {
+        size_t l = 100;
+        int r;
 
-        assert(r);
+        assert(fd >= 0);
+        assert(ret);
 
-        k = ttyname_r(fd, path, sizeof(path));
-        if (k > 0)
-                return -k;
+        for (;;) {
+                char path[l];
 
-        char_array_0(path);
+                r = ttyname_r(fd, path, sizeof(path));
+                if (r == 0) {
+                        const char *p;
+                        char *c;
 
-        c = strdup(startswith(path, "/dev/") ? path + 5 : path);
-        if (!c)
-                return -ENOMEM;
+                        p = startswith(path, "/dev/");
+                        c = strdup(p ?: path);
+                        if (!c)
+                                return -ENOMEM;
+
+                        *ret = c;
+                        return 0;
+                }
+
+                if (r != ERANGE)
+                        return -r;
+
+                l *= 2;
+        }
 
-        *r = c;
         return 0;
 }
 
@@ -3059,7 +3082,7 @@ static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bo
         fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
         if (fd < 0) {
 
-                if (errno != ENOTDIR)
+                if (errno != ENOTDIR && errno != ELOOP)
                         return -errno;
 
                 if (!dangerous) {
@@ -3986,7 +4009,7 @@ const char *default_term_for_tty(const char *tty) {
 bool dirent_is_file(const struct dirent *de) {
         assert(de);
 
-        if (ignore_file(de->d_name))
+        if (hidden_file(de->d_name))
                 return false;
 
         if (de->d_type != DT_REG &&
@@ -4005,7 +4028,7 @@ bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
             de->d_type != DT_UNKNOWN)
                 return false;
 
-        if (ignore_file_allow_backup(de->d_name))
+        if (hidden_file_allow_backup(de->d_name))
                 return false;
 
         return endswith(de->d_name, suffix);
@@ -4247,6 +4270,23 @@ bool machine_name_is_valid(const char *s) {
         return true;
 }
 
+bool image_name_is_valid(const char *s) {
+        if (!filename_is_valid(s))
+                return false;
+
+        if (string_has_cc(s, NULL))
+                return false;
+
+        if (!utf8_is_valid(s))
+                return false;
+
+        /* Temporary files for atomically creating new files */
+        if (startswith(s, ".#"))
+                return false;
+
+        return true;
+}
+
 int pipe_eof(int fd) {
         struct pollfd pollfd = {
                 .fd = fd,
@@ -5899,7 +5939,7 @@ int on_ac_power(void) {
                 if (!de)
                         break;
 
-                if (ignore_file(de->d_name))
+                if (hidden_file(de->d_name))
                         continue;
 
                 device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
@@ -6982,18 +7022,18 @@ int tempfn_xxxxxx(const char *p, char **ret) {
          *         /foo/bar/waldo
          *
          * Into this:
-         *         /foo/bar/.waldoXXXXXX
+         *         /foo/bar/.#waldoXXXXXX
          */
 
         fn = basename(p);
         if (!filename_is_valid(fn))
                 return -EINVAL;
 
-        t = new(char, strlen(p) + 1 + 6 + 1);
+        t = new(char, strlen(p) + 2 + 6 + 1);
         if (!t)
                 return -ENOMEM;
 
-        strcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), "."), fn), "XXXXXX");
+        strcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn), "XXXXXX");
 
         *ret = path_kill_slashes(t);
         return 0;
@@ -7013,18 +7053,18 @@ int tempfn_random(const char *p, char **ret) {
          *         /foo/bar/waldo
          *
          * Into this:
-         *         /foo/bar/.waldobaa2a261115984a9
+         *         /foo/bar/.#waldobaa2a261115984a9
          */
 
         fn = basename(p);
         if (!filename_is_valid(fn))
                 return -EINVAL;
 
-        t = new(char, strlen(p) + 1 + 16 + 1);
+        t = new(char, strlen(p) + 2 + 16 + 1);
         if (!t)
                 return -ENOMEM;
 
-        x = stpcpy(stpcpy(mempcpy(t, p, fn - p), "."), fn);
+        x = stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn);
 
         u = random_u64();
         for (i = 0; i < 16; i++) {
@@ -7049,14 +7089,14 @@ int tempfn_random_child(const char *p, char **ret) {
         /* Turns this:
          *         /foo/bar/waldo
          * Into this:
-         *         /foo/bar/waldo/.3c2b6219aa75d7d0
+         *         /foo/bar/waldo/.#3c2b6219aa75d7d0
          */
 
-        t = new(char, strlen(p) + 2 + 16 + 1);
+        t = new(char, strlen(p) + 3 + 16 + 1);
         if (!t)
                 return -ENOMEM;
 
-        x = stpcpy(stpcpy(t, p), "/.");
+        x = stpcpy(stpcpy(t, p), "/.#");
 
         u = random_u64();
         for (i = 0; i < 16; i++) {
@@ -7406,3 +7446,116 @@ int sethostname_idempotent(const char *s) {
 
         return 1;
 }
+
+int ptsname_malloc(int fd, char **ret) {
+        size_t l = 100;
+
+        assert(fd >= 0);
+        assert(ret);
+
+        for (;;) {
+                char *c;
+
+                c = new(char, l);
+                if (!c)
+                        return -ENOMEM;
+
+                if (ptsname_r(fd, c, l) == 0) {
+                        *ret = c;
+                        return 0;
+                }
+                if (errno != ERANGE) {
+                        free(c);
+                        return -errno;
+                }
+
+                free(c);
+                l *= 2;
+        }
+}
+
+int openpt_in_namespace(pid_t pid, int flags) {
+        _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
+        _cleanup_close_pair_ int pair[2] = { -1, -1 };
+        union {
+                struct cmsghdr cmsghdr;
+                uint8_t buf[CMSG_SPACE(sizeof(int))];
+        } control = {};
+        struct msghdr mh = {
+                .msg_control = &control,
+                .msg_controllen = sizeof(control),
+        };
+        struct cmsghdr *cmsg;
+        siginfo_t si;
+        pid_t child;
+        int r;
+
+        assert(pid > 0);
+
+        r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &rootfd);
+        if (r < 0)
+                return r;
+
+        if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0)
+                return -errno;
+
+        child = fork();
+        if (child < 0)
+                return -errno;
+
+        if (child == 0) {
+                int master;
+
+                pair[0] = safe_close(pair[0]);
+
+                r = namespace_enter(pidnsfd, mntnsfd, -1, rootfd);
+                if (r < 0)
+                        _exit(EXIT_FAILURE);
+
+                master = posix_openpt(flags);
+                if (master < 0)
+                        _exit(EXIT_FAILURE);
+
+                cmsg = CMSG_FIRSTHDR(&mh);
+                cmsg->cmsg_level = SOL_SOCKET;
+                cmsg->cmsg_type = SCM_RIGHTS;
+                cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+                memcpy(CMSG_DATA(cmsg), &master, sizeof(int));
+
+                mh.msg_controllen = cmsg->cmsg_len;
+
+                if (sendmsg(pair[1], &mh, MSG_NOSIGNAL) < 0)
+                        _exit(EXIT_FAILURE);
+
+                _exit(EXIT_SUCCESS);
+        }
+
+        pair[1] = safe_close(pair[1]);
+
+        r = wait_for_terminate(child, &si);
+        if (r < 0)
+                return r;
+        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+                return -EIO;
+
+        if (recvmsg(pair[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)
+                return -errno;
+
+        for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
+                if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
+                        int *fds;
+                        unsigned n_fds;
+
+                        fds = (int*) CMSG_DATA(cmsg);
+                        n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
+
+                        if (n_fds != 1) {
+                                close_many(fds, n_fds);
+                                return -EIO;
+                        }
+
+                        return fds[0];
+                }
+
+        return -EIO;
+}