X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev_rules.c;h=daf3d7fff7992841ab766b10a0339712828dabf2;hp=e61c9a69b062c02fa2fe083911cc964ba8789d3e;hb=1ff1aa424baa05a0fd06deeb6609a11b289ecd65;hpb=5e9eb88f2f6d99eaee16aeeb76ac08a1bf98a668 diff --git a/udev_rules.c b/udev_rules.c index e61c9a69b..daf3d7fff 100644 --- a/udev_rules.c +++ b/udev_rules.c @@ -27,12 +27,15 @@ #include #include #include +#include +#include #include #include #include "udev.h" #include "udev_rules.h" +extern char **environ; /* extract possible {attr} and move str behind it */ static char *get_format_attribute(char **str) @@ -113,6 +116,219 @@ out: return 0; } +static int run_program(const char *command, const char *subsystem, + char *result, size_t ressize, size_t *reslen) +{ + int status; + int outpipe[2] = {-1, -1}; + int errpipe[2] = {-1, -1}; + pid_t pid; + char arg[PATH_SIZE]; + char program[PATH_SIZE]; + char *argv[(sizeof(arg) / 2) + 1]; + int devnull; + int i; + int retval = 0; + + /* build argv from comand */ + strlcpy(arg, command, sizeof(arg)); + i = 0; + if (strchr(arg, ' ') != NULL) { + char *pos = arg; + + while (pos != NULL) { + if (pos[0] == '\'') { + /* don't separate if in apostrophes */ + pos++; + argv[i] = strsep(&pos, "\'"); + while (pos != NULL && pos[0] == ' ') + pos++; + } else { + argv[i] = strsep(&pos, " "); + } + dbg("arg[%i] '%s'", i, argv[i]); + i++; + } + argv[i] = NULL; + } else { + argv[0] = arg; + argv[1] = NULL; + } + info("'%s'", command); + + /* prepare pipes from child to parent */ + if (result != NULL || udev_log_priority >= LOG_INFO) { + if (pipe(outpipe) != 0) { + err("pipe failed: %s", strerror(errno)); + return -1; + } + } + if (udev_log_priority >= LOG_INFO) { + if (pipe(errpipe) != 0) { + err("pipe failed: %s", strerror(errno)); + return -1; + } + } + + /* allow programs in /lib/udev called without the path */ + if (strchr(argv[0], '/') == NULL) { + strlcpy(program, "/lib/udev/", sizeof(program)); + strlcat(program, argv[0], sizeof(program)); + argv[0] = program; + } + + pid = fork(); + switch(pid) { + case 0: + /* child closes parent ends of pipes */ + if (outpipe[READ_END] > 0) + close(outpipe[READ_END]); + if (errpipe[READ_END] > 0) + close(errpipe[READ_END]); + + /* discard child output or connect to pipe */ + devnull = open("/dev/null", O_RDWR); + if (devnull > 0) { + dup2(devnull, STDIN_FILENO); + if (outpipe[WRITE_END] < 0) + dup2(devnull, STDOUT_FILENO); + if (errpipe[WRITE_END] < 0) + dup2(devnull, STDERR_FILENO); + close(devnull); + } else + err("open /dev/null failed: %s", strerror(errno)); + if (outpipe[WRITE_END] > 0) { + dup2(outpipe[WRITE_END], STDOUT_FILENO); + close(outpipe[WRITE_END]); + } + if (errpipe[WRITE_END] > 0) { + dup2(errpipe[WRITE_END], STDERR_FILENO); + close(errpipe[WRITE_END]); + } + execv(argv[0], argv); + if (errno == ENOENT || errno == ENOTDIR) { + /* may be on a filesytem which is not mounted right now */ + info("program '%s' not found", argv[0]); + } else { + /* other problems */ + err("exec of program '%s' failed", argv[0]); + } + _exit(1); + case -1: + err("fork of '%s' failed: %s", argv[0], strerror(errno)); + return -1; + default: + /* read from child if requested */ + if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) { + ssize_t count; + size_t respos = 0; + + /* parent closes child ends of pipes */ + if (outpipe[WRITE_END] > 0) + close(outpipe[WRITE_END]); + if (errpipe[WRITE_END] > 0) + close(errpipe[WRITE_END]); + + /* read child output */ + while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) { + int fdcount; + fd_set readfds; + + FD_ZERO(&readfds); + if (outpipe[READ_END] > 0) + FD_SET(outpipe[READ_END], &readfds); + if (errpipe[READ_END] > 0) + FD_SET(errpipe[READ_END], &readfds); + fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL); + if (fdcount < 0) { + if (errno == EINTR) + continue; + retval = -1; + break; + } + + /* get stdout */ + if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) { + char inbuf[1024]; + char *pos; + char *line; + + count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1); + if (count <= 0) { + close(outpipe[READ_END]); + outpipe[READ_END] = -1; + if (count < 0) { + err("stdin read failed: %s", strerror(errno)); + retval = -1; + } + continue; + } + inbuf[count] = '\0'; + + /* store result for rule processing */ + if (result) { + if (respos + count < ressize) { + memcpy(&result[respos], inbuf, count); + respos += count; + } else { + err("ressize %ld too short", (long)ressize); + retval = -1; + } + } + pos = inbuf; + while ((line = strsep(&pos, "\n"))) + if (pos || line[0] != '\0') + info("'%s' (stdout) '%s'", argv[0], line); + } + + /* get stderr */ + if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) { + char errbuf[1024]; + char *pos; + char *line; + + count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1); + if (count <= 0) { + close(errpipe[READ_END]); + errpipe[READ_END] = -1; + if (count < 0) + err("stderr read failed: %s", strerror(errno)); + continue; + } + errbuf[count] = '\0'; + pos = errbuf; + while ((line = strsep(&pos, "\n"))) + if (pos || line[0] != '\0') + info("'%s' (stderr) '%s'", argv[0], line); + } + } + if (outpipe[READ_END] > 0) + close(outpipe[READ_END]); + if (errpipe[READ_END] > 0) + close(errpipe[READ_END]); + + /* return the childs stdout string */ + if (result) { + result[respos] = '\0'; + dbg("result='%s'", result); + if (reslen) + *reslen = respos; + } + } + waitpid(pid, &status, 0); + if (WIFEXITED(status)) { + info("'%s' returned with status %i", argv[0], WEXITSTATUS(status)); + if (WEXITSTATUS(status) != 0) + retval = -1; + } else { + err("'%s' abnormal exit", argv[0]); + retval = -1; + } + } + + return retval; +} + static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize) { char line[LINE_SIZE]; @@ -190,7 +406,7 @@ static int import_program_into_env(struct udevice *udev, const char *program) char result[2048]; size_t reslen; - if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0) + if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen) != 0) return -1; return import_keys_into_env(udev, result, reslen); } @@ -238,6 +454,64 @@ static int import_parent_into_env(struct udevice *udev, const char *filter) return rc; } +static int pass_env_to_socket(const char *sockname, const char *devpath, const char *action) +{ + int sock; + struct sockaddr_un saddr; + socklen_t addrlen; + char buf[2048]; + size_t bufpos = 0; + int i; + ssize_t count; + int retval = 0; + + dbg("pass environment to socket '%s'", sockname); + sock = socket(AF_LOCAL, SOCK_DGRAM, 0); + memset(&saddr, 0x00, sizeof(struct sockaddr_un)); + saddr.sun_family = AF_LOCAL; + /* abstract namespace only */ + strcpy(&saddr.sun_path[1], sockname); + addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1; + + bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath); + bufpos++; + for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) { + bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1); + bufpos++; + } + + count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen); + if (count < 0) + retval = -1; + info("passed %zi bytes to socket '%s', ", count, sockname); + + close(sock); + return retval; +} + +int udev_rules_run(struct udevice *udev) +{ + struct name_entry *name_loop; + int retval = 0; + + dbg("executing run list"); + list_for_each_entry(name_loop, &udev->run_list, node) { + if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0) { + pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action); + } else { + char program[PATH_SIZE]; + + strlcpy(program, name_loop->name, sizeof(program)); + udev_rules_apply_format(udev, program, sizeof(program)); + if (run_program(program, udev->dev->subsystem, NULL, 0, NULL) != 0) + if (!name_loop->ignore_error) + retval = -1; + } + } + + return retval; +} + #define WAIT_LOOP_PER_SECOND 50 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout) { @@ -267,10 +541,48 @@ static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout) info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND); usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND); } - err("waiting for '%s' failed", filepath); + info("waiting for '%s' failed", filepath); return -1; } +/* handle "[$SUBSYSTEM/$KERNEL]" lookup */ +static int attr_get_by_subsys_id(const char *attrstr, char *devpath, size_t len, char **attr) +{ + char subsys[NAME_SIZE]; + char *attrib; + char *id; + int found = 0; + + if (attrstr[0] != '[') + goto out; + + strlcpy(subsys, &attrstr[1], sizeof(subsys)); + + attrib = strchr(subsys, ']'); + if (attrib == NULL) + goto out; + attrib[0] = '\0'; + attrib = &attrib[1]; + + id = strchr(subsys, '/'); + if (id == NULL) + goto out; + id[0] = '\0'; + id = &id[1]; + + if (sysfs_lookup_devpath_by_subsys_id(devpath, len, subsys, id)) { + if (attr != NULL) { + if (attrib[0] != '\0') + *attr = attrib; + else + *attr = NULL; + } + found = 1; + } +out: + return found; +} + void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize) { char temp[PATH_SIZE]; @@ -443,11 +755,20 @@ found: if (attr == NULL) err("missing file parameter for attr"); else { + char devpath[PATH_SIZE]; + char *attrib; const char *value = NULL; size_t size; - /* first try the current device, other matches may have selected */ - if (udev->dev_parent != NULL && udev->dev_parent != udev->dev) + if (attr_get_by_subsys_id(attr, devpath, sizeof(devpath), &attrib)) { + if (attrib != NULL) + value = sysfs_attr_get_value(devpath, attrib); + else + break; + } + + /* try the current device, other matches may have selected */ + if (value == NULL && udev->dev_parent != NULL && udev->dev_parent != udev->dev) value = sysfs_attr_get_value(udev->dev_parent->devpath, attr); /* look at all devices along the chain of parents */ @@ -619,10 +940,25 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver)) goto nomatch; - /* match NAME against a value assigned by an earlier rule */ if (match_key("NAME", rule, &rule->name, udev->name)) goto nomatch; + /* match against current list of symlinks */ + if (rule->symlink_match.operation == KEY_OP_MATCH || + rule->symlink_match.operation == KEY_OP_NOMATCH) { + struct name_entry *name_loop; + int match = 0; + + list_for_each_entry(name_loop, &udev->symlink_list, node) { + if (match_key("SYMLINK", rule, &rule->symlink_match, name_loop->name) == 0) { + match = 1; + break; + } + } + if (!match) + goto nomatch; + } + for (i = 0; i < rule->env.count; i++) { struct key_pair *pair = &rule->env.keys[i]; @@ -641,6 +977,40 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) } } + if (rule->test.operation != KEY_OP_UNSET) { + char filename[PATH_SIZE]; + char devpath[PATH_SIZE]; + char *attr; + struct stat statbuf; + int match; + + strlcpy(filename, key_val(rule, &rule->test), sizeof(filename)); + udev_rules_apply_format(udev, filename, sizeof(filename)); + + if (attr_get_by_subsys_id(filename, devpath, sizeof(devpath), &attr)) { + strlcpy(filename, sysfs_path, sizeof(filename)); + strlcat(filename, devpath, sizeof(filename)); + if (attr != NULL) { + strlcat(filename, "/", sizeof(filename)); + strlcat(filename, attr, sizeof(filename)); + } + } + + match = (stat(filename, &statbuf) == 0); + info("'%s' %s", filename, match ? "exists" : "does not exist"); + if (match && rule->test_mode_mask > 0) { + match = ((statbuf.st_mode & rule->test_mode_mask) > 0); + info("'%s' has mode=%#o and %s %#o", filename, statbuf.st_mode, + match ? "matches" : "does not match", + rule->test_mode_mask); + } + if (match && rule->test.operation == KEY_OP_NOMATCH) + goto nomatch; + if (!match && rule->test.operation == KEY_OP_MATCH) + goto nomatch; + dbg("TEST key is true"); + } + if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) { int found; @@ -657,11 +1027,20 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) pair->key.operation == KEY_OP_NOMATCH) { const char *key_name = key_pair_name(rule, pair); const char *key_value = key_val(rule, &pair->key); - const char *value; + char devpath[PATH_SIZE]; + char *attrib; + const char *value = NULL; char val[VALUE_SIZE]; size_t len; - value = sysfs_attr_get_value(udev->dev->devpath, key_name); + if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) { + if (attrib != NULL) + value = sysfs_attr_get_value(devpath, attrib); + else + goto nomatch; + } + if (value == NULL) + value = sysfs_attr_get_value(udev->dev->devpath, key_name); if (value == NULL) goto nomatch; strlcpy(val, value, sizeof(val)); @@ -747,7 +1126,7 @@ try_parent: strlcpy(program, key_val(rule, &rule->program), sizeof(program)); udev_rules_apply_format(udev, program, sizeof(program)); - if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) { + if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL) != 0) { dbg("PROGRAM is false"); udev->program_result[0] = '\0'; if (rule->program.operation != KEY_OP_NOMATCH) @@ -757,9 +1136,12 @@ try_parent: dbg("PROGRAM matches"); remove_trailing_chars(result, '\n'); - count = replace_chars(result, ALLOWED_CHARS_INPUT); - if (count) - info("%i character(s) replaced" , count); + if (rule->string_escape == ESCAPE_UNSET || + rule->string_escape == ESCAPE_REPLACE) { + count = replace_chars(result, ALLOWED_CHARS_INPUT); + if (count > 0) + info("%i character(s) replaced" , count); + } dbg("result is '%s'", result); strlcpy(udev->program_result, result, sizeof(udev->program_result)); dbg("PROGRAM returned successful"); @@ -817,12 +1199,13 @@ try_parent: unsetenv(key_name); info("unset ENV '%s'", key_name); } else { - char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value); + struct name_entry *entry; - if (key_value == NULL) + entry = name_list_key_add(&udev->env_list, key_name, temp_value); + if (entry == NULL) break; - putenv(key_value); - info("set ENV '%s'", key_value); + putenv(entry->name); + info("set ENV '%s'", entry->name); } } } @@ -833,14 +1216,28 @@ try_parent: if (pair->key.operation == KEY_OP_ASSIGN) { const char *key_name = key_pair_name(rule, pair); - char attr[PATH_SIZE]; + char devpath[PATH_SIZE]; + char *attrib; + char attr[PATH_SIZE] = ""; char value[NAME_SIZE]; FILE *f; - strlcpy(attr, sysfs_path, sizeof(attr)); - strlcat(attr, udev->dev->devpath, sizeof(attr)); - strlcat(attr, "/", sizeof(attr)); - strlcat(attr, key_name, sizeof(attr)); + if (attr_get_by_subsys_id(key_name, devpath, sizeof(devpath), &attrib)) { + if (attrib != NULL) { + strlcpy(attr, sysfs_path, sizeof(attr)); + strlcat(attr, devpath, sizeof(attr)); + strlcat(attr, "/", sizeof(attr)); + strlcat(attr, attrib, sizeof(attr)); + } + } + + if (attr[0] == '\0') { + strlcpy(attr, sysfs_path, sizeof(attr)); + strlcat(attr, udev->dev->devpath, sizeof(attr)); + strlcat(attr, "/", sizeof(attr)); + strlcat(attr, key_name, sizeof(attr)); + } + strlcpy(value, key_val(rule, &pair->key), sizeof(value)); udev_rules_apply_format(udev, value, sizeof(value)); info("writing '%s' to sysfs file '%s'", value, attr); @@ -868,6 +1265,9 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) dbg("udev->dev->devpath='%s'", udev->dev->devpath); dbg("udev->dev->kernel='%s'", udev->dev->kernel); + /* use kernel name as default node name */ + strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name)); + /* look for a matching rule to apply */ udev_rules_iter_init(rules); while (1) { @@ -929,23 +1329,30 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) } /* collect symlinks */ - if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) { + if (!udev->symlink_final && + (rule->symlink.operation == KEY_OP_ASSIGN || + rule->symlink.operation == KEY_OP_ASSIGN_FINAL || + rule->symlink.operation == KEY_OP_ADD)) { char temp[PATH_SIZE]; char *pos, *next; int count; if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL) udev->symlink_final = 1; - if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) { + if (rule->symlink.operation == KEY_OP_ASSIGN || + rule->symlink.operation == KEY_OP_ASSIGN_FINAL) { info("reset symlink list"); name_list_cleanup(&udev->symlink_list); } /* allow multiple symlinks separated by spaces */ strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp)); udev_rules_apply_format(udev, temp, sizeof(temp)); - count = replace_chars(temp, ALLOWED_CHARS_FILE " "); - if (count) - info("%i character(s) replaced" , count); + if (rule->string_escape == ESCAPE_UNSET || + rule->string_escape == ESCAPE_REPLACE) { + count = replace_chars(temp, ALLOWED_CHARS_FILE " "); + if (count > 0) + info("%i character(s) replaced" , count); + } dbg("rule applied, added symlink(s) '%s'", temp); pos = temp; while (isspace(pos[0])) @@ -975,9 +1382,12 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) name_set = 1; strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name)); udev_rules_apply_format(udev, udev->name, sizeof(udev->name)); - count = replace_chars(udev->name, ALLOWED_CHARS_FILE); - if (count) - info("%i character(s) replaced", count); + if (rule->string_escape == ESCAPE_UNSET || + rule->string_escape == ESCAPE_REPLACE) { + count = replace_chars(udev->name, ALLOWED_CHARS_FILE); + if (count > 0) + info("%i character(s) replaced", count); + } info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name); if (strcmp(udev->dev->subsystem, "net") != 0) @@ -986,6 +1396,8 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) } if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) { + struct name_entry *entry; + if (rule->run.operation == KEY_OP_ASSIGN_FINAL) udev->run_final = 1; if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) { @@ -993,7 +1405,9 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) name_list_cleanup(&udev->run_list); } dbg("add run '%s'", key_val(rule, &rule->run)); - name_list_add(&udev->run_list, key_val(rule, &rule->run), 0); + entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0); + if (rule->run_ignore_error) + entry->ignore_error = 1; } if (rule->last_rule) { @@ -1008,10 +1422,8 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) } } - if (!name_set) { - strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name)); + if (!name_set) info("no node name set, will use kernel name '%s'", udev->name); - } if (udev->tmp_node[0] != '\0') { dbg("removing temporary device node"); @@ -1037,7 +1449,8 @@ int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev) dbg("process rule"); if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET || - rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) { + rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || + rule->group.operation != KEY_OP_UNSET) { dbg("skip rule that names a device"); continue; } @@ -1050,12 +1463,17 @@ int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev) } if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) { - if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) { + struct name_entry *entry; + + if (rule->run.operation == KEY_OP_ASSIGN || + rule->run.operation == KEY_OP_ASSIGN_FINAL) { info("reset run list"); name_list_cleanup(&udev->run_list); } dbg("add run '%s'", key_val(rule, &rule->run)); - name_list_add(&udev->run_list, key_val(rule, &rule->run), 0); + entry = name_list_add(&udev->run_list, key_val(rule, &rule->run), 0); + if (rule->run_ignore_error) + entry->ignore_error = 1; if (rule->run.operation == KEY_OP_ASSIGN_FINAL) break; }