/* * Copyright (C) 2003-2013 Kay Sievers * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "udev.h" struct udev_event *udev_event_new(struct udev_device *dev) { struct udev *udev = udev_device_get_udev(dev); struct udev_event *event; event = new0(struct udev_event, 1); if (event == NULL) return NULL; event->dev = dev; event->udev = udev; udev_list_init(udev, &event->run_list, false); udev_list_init(udev, &event->seclabel_list, false); event->fd_signal = -1; event->birth_usec = now(CLOCK_MONOTONIC); return event; } void udev_event_unref(struct udev_event *event) { if (event == NULL) return; udev_list_cleanup(&event->run_list); udev_list_cleanup(&event->seclabel_list); free(event->program_result); free(event->name); free(event); } size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size, bool replace_whitespace) { struct udev_device *dev = event->dev; enum subst_type { SUBST_UNKNOWN, SUBST_DEVNODE, SUBST_ATTR, SUBST_ENV, SUBST_KERNEL, SUBST_KERNEL_NUMBER, SUBST_DRIVER, SUBST_DEVPATH, SUBST_ID, SUBST_MAJOR, SUBST_MINOR, SUBST_RESULT, SUBST_PARENT, SUBST_NAME, SUBST_LINKS, SUBST_ROOT, SUBST_SYS, }; static const struct subst_map { const char *name; const char fmt; enum subst_type type; } map[] = { { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE }, { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE }, { .name = "attr", .fmt = 's', .type = SUBST_ATTR }, { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR }, { .name = "env", .fmt = 'E', .type = SUBST_ENV }, { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL }, { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER }, { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, { .name = "id", .fmt = 'b', .type = SUBST_ID }, { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, { .name = "name", .fmt = 'D', .type = SUBST_NAME }, { .name = "links", .fmt = 'L', .type = SUBST_LINKS }, { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, { .name = "sys", .fmt = 'S', .type = SUBST_SYS }, }; const char *from; char *s; size_t l; from = src; s = dest; l = size; for (;;) { enum subst_type type = SUBST_UNKNOWN; char attrbuf[UTIL_PATH_SIZE], sbuf[UTIL_PATH_SIZE]; char *attr = NULL, *_s; size_t _l; bool replws = replace_whitespace; while (from[0] != '\0') { if (from[0] == '$') { /* substitute named variable */ unsigned int i; if (from[1] == '$') { from++; goto copy; } for (i = 0; i < ELEMENTSOF(map); i++) { if (startswith(&from[1], map[i].name)) { type = map[i].type; from += strlen(map[i].name)+1; goto subst; } } } else if (from[0] == '%') { /* substitute format char */ unsigned int i; if (from[1] == '%') { from++; goto copy; } for (i = 0; i < ELEMENTSOF(map); i++) { if (from[1] == map[i].fmt) { type = map[i].type; from += 2; goto subst; } } } copy: /* copy char */ if (l == 0) goto out; s[0] = from[0]; from++; s++; l--; } goto out; subst: /* extract possible $format{attr} */ if (from[0] == '{') { unsigned int i; from++; for (i = 0; from[i] != '}'; i++) { if (from[i] == '\0') { log_error("missing closing brace for format '%s'", src); goto out; } } if (i >= sizeof(attrbuf)) goto out; memcpy(attrbuf, from, i); attrbuf[i] = '\0'; from += i+1; attr = attrbuf; } else { attr = NULL; } /* result subst handles space as field separator */ if (type == SUBST_RESULT) replws = false; if (replws) { /* store dest string ptr and remaining len */ _s = s; _l = l; /* temporarily use sbuf */ s = sbuf; l = UTIL_PATH_SIZE; } switch (type) { case SUBST_DEVPATH: l = strpcpy(&s, l, udev_device_get_devpath(dev)); break; case SUBST_KERNEL: l = strpcpy(&s, l, udev_device_get_sysname(dev)); break; case SUBST_KERNEL_NUMBER: if (udev_device_get_sysnum(dev) == NULL) break; l = strpcpy(&s, l, udev_device_get_sysnum(dev)); break; case SUBST_ID: if (event->dev_parent == NULL) break; l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent)); break; case SUBST_DRIVER: { const char *driver; if (event->dev_parent == NULL) break; driver = udev_device_get_driver(event->dev_parent); if (driver == NULL) break; l = strpcpy(&s, l, driver); break; } case SUBST_MAJOR: { char num[UTIL_PATH_SIZE]; sprintf(num, "%u", major(udev_device_get_devnum(dev))); l = strpcpy(&s, l, num); break; } case SUBST_MINOR: { char num[UTIL_PATH_SIZE]; sprintf(num, "%u", minor(udev_device_get_devnum(dev))); l = strpcpy(&s, l, num); break; } case SUBST_RESULT: { char *rest; int i; if (event->program_result == NULL) break; /* get part part of the result string */ i = 0; if (attr != NULL) i = strtoul(attr, &rest, 10); if (i > 0) { char result[UTIL_PATH_SIZE]; char tmp[UTIL_PATH_SIZE]; char *cpos; strscpy(result, sizeof(result), event->program_result); cpos = result; while (--i) { while (cpos[0] != '\0' && !isspace(cpos[0])) cpos++; while (isspace(cpos[0])) cpos++; if (cpos[0] == '\0') break; } if (i > 0) { log_error("requested part of result string not found"); break; } strscpy(tmp, sizeof(tmp), cpos); /* %{2+}c copies the whole string from the second part on */ if (rest[0] != '+') { cpos = strchr(tmp, ' '); if (cpos) cpos[0] = '\0'; } l = strpcpy(&s, l, tmp); } else { l = strpcpy(&s, l, event->program_result); } break; } case SUBST_ATTR: { const char *value = NULL; char vbuf[UTIL_NAME_SIZE]; size_t len; int count; if (attr == NULL) { log_error("missing file parameter for attr"); break; } /* try to read the value specified by "[dmi/id]product_name" */ if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0) value = vbuf; /* try to read the attribute the device */ if (value == NULL) value = udev_device_get_sysattr_value(event->dev, attr); /* try to read the attribute of the parent device, other matches have selected */ if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev) value = udev_device_get_sysattr_value(event->dev_parent, attr); if (value == NULL) break; /* strip trailing whitespace, and replace unwanted characters */ if (value != vbuf) strscpy(vbuf, sizeof(vbuf), value); len = strlen(vbuf); while (len > 0 && isspace(vbuf[--len])) vbuf[len] = '\0'; count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT); if (count > 0) log_debug("%i character(s) replaced" , count); l = strpcpy(&s, l, vbuf); break; } case SUBST_PARENT: { struct udev_device *dev_parent; const char *devnode; dev_parent = udev_device_get_parent(event->dev); if (dev_parent == NULL) break; devnode = udev_device_get_devnode(dev_parent); if (devnode != NULL) l = strpcpy(&s, l, devnode + strlen("/dev/")); break; } case SUBST_DEVNODE: if (udev_device_get_devnode(dev) != NULL) l = strpcpy(&s, l, udev_device_get_devnode(dev)); break; case SUBST_NAME: if (event->name != NULL) l = strpcpy(&s, l, event->name); else if (udev_device_get_devnode(dev) != NULL) l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/")); else l = strpcpy(&s, l, udev_device_get_sysname(dev)); break; case SUBST_LINKS: { struct udev_list_entry *list_entry; list_entry = udev_device_get_devlinks_list_entry(dev); if (list_entry == NULL) break; l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/")); udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL); break; } case SUBST_ROOT: l = strpcpy(&s, l, "/dev"); break; case SUBST_SYS: l = strpcpy(&s, l, "/sys"); break; case SUBST_ENV: if (attr == NULL) { break; } else { const char *value; value = udev_device_get_property_value(event->dev, attr); if (value == NULL) break; l = strpcpy(&s, l, value); break; } default: log_error("unknown substitution type=%i", type); break; } /* replace whitespace in sbuf and copy to dest */ if (replws) { size_t tmplen = UTIL_PATH_SIZE - l; /* restore s and l to dest string values */ s = _s; l = _l; /* copy ws-replaced value to s */ tmplen = util_replace_whitespace(sbuf, s, MIN(tmplen, l)); l -= tmplen; s += tmplen; } } out: s[0] = '\0'; return l; } static int spawn_exec(struct udev_event *event, const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask, int fd_stdout, int fd_stderr) { _cleanup_close_ int fd = -1; /* discard child output or connect to pipe */ fd = open("/dev/null", O_RDWR); if (fd >= 0) { dup2(fd, STDIN_FILENO); if (fd_stdout < 0) dup2(fd, STDOUT_FILENO); if (fd_stderr < 0) dup2(fd, STDERR_FILENO); } else log_error_errno(errno, "open /dev/null failed: %m"); /* connect pipes to std{out,err} */ if (fd_stdout >= 0) { dup2(fd_stdout, STDOUT_FILENO); safe_close(fd_stdout); } if (fd_stderr >= 0) { dup2(fd_stderr, STDERR_FILENO); safe_close(fd_stderr); } /* terminate child in case parent goes away */ prctl(PR_SET_PDEATHSIG, SIGTERM); /* restore original udev sigmask before exec */ if (sigmask) sigprocmask(SIG_SETMASK, sigmask, NULL); execve(argv[0], argv, envp); /* exec failed */ log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd); return -errno; } static void spawn_read(struct udev_event *event, usec_t timeout_usec, const char *cmd, int fd_stdout, int fd_stderr, char *result, size_t ressize) { _cleanup_close_ int fd_ep = -1; struct epoll_event ep_outpipe = { .events = EPOLLIN, .data.ptr = &fd_stdout, }; struct epoll_event ep_errpipe = { .events = EPOLLIN, .data.ptr = &fd_stderr, }; size_t respos = 0; int r; /* read from child if requested */ if (fd_stdout < 0 && fd_stderr < 0) return; fd_ep = epoll_create1(EPOLL_CLOEXEC); if (fd_ep < 0) { log_error_errno(errno, "error creating epoll fd: %m"); return; } if (fd_stdout >= 0) { r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe); if (r < 0) { log_error_errno(errno, "fail to add stdout fd to epoll: %m"); return; } } if (fd_stderr >= 0) { r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe); if (r < 0) { log_error_errno(errno, "fail to add stderr fd to epoll: %m"); return; } } /* read child output */ while (fd_stdout >= 0 || fd_stderr >= 0) { int timeout; int fdcount; struct epoll_event ev[4]; int i; if (timeout_usec > 0) { usec_t age_usec; age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; if (age_usec >= timeout_usec) { log_error("timeout '%s'", cmd); return; } timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; } else { timeout = -1; } fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); if (fdcount < 0) { if (errno == EINTR) continue; log_error_errno(errno, "failed to poll: %m"); return; } else if (fdcount == 0) { log_error("timeout '%s'", cmd); return; } for (i = 0; i < fdcount; i++) { int *fd = (int *)ev[i].data.ptr; if (*fd < 0) continue; if (ev[i].events & EPOLLIN) { ssize_t count; char buf[4096]; count = read(*fd, buf, sizeof(buf)-1); if (count <= 0) continue; buf[count] = '\0'; /* store stdout result */ if (result != NULL && *fd == fd_stdout) { if (respos + count < ressize) { memcpy(&result[respos], buf, count); respos += count; } else { log_error("'%s' ressize %zu too short", cmd, ressize); } } /* log debug output only if we watch stderr */ if (fd_stderr >= 0) { char *pos; char *line; pos = buf; while ((line = strsep(&pos, "\n"))) { if (pos != NULL || line[0] != '\0') log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line); } } } else if (ev[i].events & EPOLLHUP) { r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL); if (r < 0) { log_error_errno(errno, "failed to remove fd from epoll: %m"); return; } *fd = -1; } } } /* return the child's stdout string */ if (result != NULL) result[respos] = '\0'; } static int spawn_wait(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const char *cmd, pid_t pid) { struct pollfd pfd[1]; int err = 0; pfd[0].events = POLLIN; pfd[0].fd = event->fd_signal; while (pid > 0) { int timeout; int timeout_warn = 0; int fdcount; if (timeout_usec > 0) { usec_t age_usec; age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; if (age_usec >= timeout_usec) timeout = 1000; else { if (timeout_warn_usec > 0) timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; } } else { timeout = -1; } fdcount = poll(pfd, 1, timeout_warn); if (fdcount < 0) { if (errno == EINTR) continue; err = -errno; log_error_errno(errno, "failed to poll: %m"); goto out; } if (fdcount == 0) { log_warning("slow: '%s' ["PID_FMT"]", cmd, pid); fdcount = poll(pfd, 1, timeout); if (fdcount < 0) { if (errno == EINTR) continue; err = -errno; log_error_errno(errno, "failed to poll: %m"); goto out; } if (fdcount == 0) { log_error("timeout: killing '%s' ["PID_FMT"]", cmd, pid); kill(pid, SIGKILL); } } if (pfd[0].revents & POLLIN) { struct signalfd_siginfo fdsi; int status; ssize_t size; size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); if (size != sizeof(struct signalfd_siginfo)) continue; switch (fdsi.ssi_signo) { case SIGTERM: event->sigterm = true; break; case SIGCHLD: if (waitpid(pid, &status, WNOHANG) < 0) break; if (WIFEXITED(status)) { log_debug("'%s' ["PID_FMT"] exit with return code %i", cmd, pid, WEXITSTATUS(status)); if (WEXITSTATUS(status) != 0) err = -1; } else if (WIFSIGNALED(status)) { log_error("'%s' ["PID_FMT"] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status))); err = -1; } else if (WIFSTOPPED(status)) { log_error("'%s' ["PID_FMT"] stopped", cmd, pid); err = -1; } else if (WIFCONTINUED(status)) { log_error("'%s' ["PID_FMT"] continued", cmd, pid); err = -1; } else { log_error("'%s' ["PID_FMT"] exit with status 0x%04x", cmd, pid, status); err = -1; } pid = 0; break; } } } out: return err; } int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) { int i = 0; char *pos; if (strchr(cmd, ' ') == NULL) { argv[i++] = cmd; goto out; } pos = cmd; while (pos != NULL && pos[0] != '\0') { if (pos[0] == '\'') { /* do not separate quotes */ pos++; argv[i] = strsep(&pos, "\'"); if (pos != NULL) while (pos[0] == ' ') pos++; } else { argv[i] = strsep(&pos, " "); if (pos != NULL) while (pos[0] == ' ') pos++; } i++; } out: argv[i] = NULL; if (argc) *argc = i; return 0; } int udev_event_spawn(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const char *cmd, char **envp, const sigset_t *sigmask, char *result, size_t ressize) { int outpipe[2] = {-1, -1}; int errpipe[2] = {-1, -1}; pid_t pid; char arg[UTIL_PATH_SIZE]; char *argv[128]; char program[UTIL_PATH_SIZE]; int err = 0; strscpy(arg, sizeof(arg), cmd); udev_build_argv(event->udev, arg, NULL, argv); /* pipes from child to parent */ if (result != NULL || log_get_max_level() >= LOG_INFO) { if (pipe2(outpipe, O_NONBLOCK) != 0) { err = -errno; log_error_errno(errno, "pipe failed: %m"); goto out; } } if (log_get_max_level() >= LOG_INFO) { if (pipe2(errpipe, O_NONBLOCK) != 0) { err = -errno; log_error_errno(errno, "pipe failed: %m"); goto out; } } /* allow programs in /usr/lib/udev/ to be called without the path */ if (argv[0][0] != '/') { strscpyl(program, sizeof(program), UDEV_LIBEXEC_DIR "/", argv[0], NULL); #ifdef HAVE_SPLIT_USR if(access(program, X_OK)) strscpyl(program, sizeof(program), "/usr/lib/udev/", argv[0], NULL); if(access(program, X_OK)) strscpyl(program, sizeof(program), "/lib/udev/", argv[0], NULL); #endif argv[0] = program; } pid = fork(); switch(pid) { case 0: /* child closes parent's ends of pipes */ if (outpipe[READ_END] >= 0) { close(outpipe[READ_END]); outpipe[READ_END] = -1; } if (errpipe[READ_END] >= 0) { close(errpipe[READ_END]); errpipe[READ_END] = -1; } log_debug("starting '%s'", cmd); spawn_exec(event, cmd, argv, envp, sigmask, outpipe[WRITE_END], errpipe[WRITE_END]); _exit(2 ); case -1: log_error_errno(errno, "fork of '%s' failed: %m", cmd); err = -1; goto out; default: /* parent closed child's ends of pipes */ if (outpipe[WRITE_END] >= 0) { close(outpipe[WRITE_END]); outpipe[WRITE_END] = -1; } if (errpipe[WRITE_END] >= 0) { close(errpipe[WRITE_END]); errpipe[WRITE_END] = -1; } spawn_read(event, timeout_usec, cmd, outpipe[READ_END], errpipe[READ_END], result, ressize); err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid); } out: if (outpipe[READ_END] >= 0) close(outpipe[READ_END]); if (outpipe[WRITE_END] >= 0) close(outpipe[WRITE_END]); if (errpipe[READ_END] >= 0) close(errpipe[READ_END]); if (errpipe[WRITE_END] >= 0) close(errpipe[WRITE_END]); return err; } #ifdef ENABLE_RULE_GENERATOR /* function to return the count of rules that assign NAME= to a value matching arg#2 , defined in udev-rules.c */ int udev_rules_assigning_name_to(struct udev_rules *rules,const char *match_name); #endif static int rename_netif_dev_fromname_toname(struct udev_device *dev,const char *oldname,const char *name) { int r; int sk; struct ifreq ifr; log_debug("changing net interface name from '%s' to '%s'\n",oldname,name); sk = socket(PF_INET, SOCK_DGRAM, 0); if (sk < 0) return log_error_errno(-errno, "error opening socket: %m"); memzero(&ifr, sizeof(struct ifreq)); strscpy(ifr.ifr_name, IFNAMSIZ, oldname); strscpy(ifr.ifr_newname, IFNAMSIZ, name); r = ioctl(sk, SIOCSIFNAME, &ifr); #ifdef ENABLE_RULE_GENERATOR int loop; struct ifreq ifr_tmp; if (r == 0) { log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname); goto out; } /* keep trying if the destination interface name already exists */ log_debug("collision on rename of network interface %s to %s , retrying until timeout\n", ifr.ifr_name, ifr.ifr_newname); /* there has been a collision so rename my name to a temporal name, letting other one to rename to my name, freeying its name... */ memzero(&ifr_tmp, sizeof(struct ifreq)); strscpy(ifr_tmp.ifr_name, IFNAMSIZ, oldname); snprintf(ifr_tmp.ifr_newname, IFNAMSIZ, "rename_%s", oldname); r = ioctl(sk, SIOCSIFNAME, &ifr_tmp); log_info("Temporarily renamed network interface %s to %s\n", ifr_tmp.ifr_name, ifr_tmp.ifr_newname); /* we have changed our name so in subsequents tries i should rename my temporal name to the wanted one */ strscpy(ifr.ifr_name, IFNAMSIZ, ifr_tmp.ifr_newname); r = -errno; if (r != -EEXIST) goto out; /* wait a maximum of 90 seconds for our target to become available */ loop = 90 * 20; while (loop--) { const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 }; nanosleep(&duration, NULL); r = ioctl(sk, SIOCSIFNAME, &ifr); if (r == 0) { log_info("renamed network interface %s to %s\n", ifr.ifr_name, ifr.ifr_newname); break; } r = -errno; if (r != -EEXIST) break; } out: #endif if (r < 0) log_error_errno(-errno, "Error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname); else log_debug("renamed network interface '%s' to '%s'", oldname, name); close(sk); return r; } static int rename_netif(struct udev_event *event) { return rename_netif_dev_fromname_toname(event->dev,udev_device_get_sysname(event->dev),event->name); } void udev_event_execute_rules(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, struct udev_list *properties_list, struct udev_rules *rules, const sigset_t *sigmask) { struct udev_device *dev = event->dev; if (udev_device_get_subsystem(dev) == NULL) return; if (streq(udev_device_get_action(dev), "remove")) { udev_device_read_db(dev); udev_device_tag_index(dev, NULL, false); udev_device_delete_db(dev); if (major(udev_device_get_devnum(dev)) != 0) udev_watch_end(event->udev, dev); udev_rules_apply_to_event(rules, event, timeout_usec, timeout_warn_usec, properties_list, sigmask); if (major(udev_device_get_devnum(dev)) != 0) udev_node_remove(dev); } else { event->dev_db = udev_device_clone_with_db(dev); if (event->dev_db != NULL) { /* disable watch during event processing */ if (major(udev_device_get_devnum(dev)) != 0) udev_watch_end(event->udev, event->dev_db); } if (major(udev_device_get_devnum(dev)) == 0 && streq(udev_device_get_action(dev), "move")) udev_device_copy_properties(dev, event->dev_db); udev_rules_apply_to_event(rules, event, timeout_usec, timeout_warn_usec, properties_list, sigmask); /* rename a new network interface, if needed */ /* ENABLE_RULE_GENERATOR conditional: * if this is a net iface, and it is an add event, * and as long as all of the following are FALSE: * - no NAME target and the current name is not being used * - there is a NAME target and it is the same as the current name * - the rules can successfully be searched for the current name (not really part of the conditional) * the run the rename. * * note - udev_rules_assigning_name_to is run when event->name is NULL to ensure renames happen, * but also on its own to check if a temp-rename is necessary when event->name exists. * * A temp-rename is necessary when: * - there is no rule renaming the current iface but the current name IS used in some other rule * - there is a rule renaming the current iface, * the current name IS used AND the target name != the current name */ #ifdef ENABLE_RULE_GENERATOR int r; if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") && (event->name == NULL && (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0 || event->name != NULL && !streq(event->name, udev_device_get_sysname(dev)))) { char syspath[UTIL_PATH_SIZE]; char *pos; char *finalifname = event->name; char newifname[IFNAMSIZ]; /* r is the number of rules that assign a device with NAME= this sysname */ if (r > 0 || (r=udev_rules_assigning_name_to(rules,udev_device_get_sysname(dev))) > 0) { /* have a conflict, rename to a temp name */ char *newpos; int ifidnum; /* build the temporary iface name */ strscpy(newifname, IFNAMSIZ, udev_device_get_sysname(dev)); newpos=pos=&newifname[strcspn(newifname,"0123456789")]; ifidnum=(int)strtol(pos,&newpos,10); *pos='\0'; if (newpos > pos && *newpos == '\0') /* append new iface num to name */ /* use udev_device_get_ifindex(dev) as it is unique to every iface */ snprintf(pos,IFNAMSIZ+(newifname-pos), "%d", 128 - udev_device_get_ifindex(dev)); /* note, r > 0, which will skip the post-rename stuff if no rename occurs */ /* if sysname isn't already the tmpname (ie there is no numeric component), do the rename */ if (!streq(newifname,udev_device_get_sysname(dev))) { r = rename_netif_dev_fromname_toname(dev,udev_device_get_sysname(dev),newifname); if (r == 0) { finalifname = newifname; log_debug("renamed netif to '%s' for collision avoidance\n", newifname); } else { log_error("could not rename netif to '%s' for collision avoidance\n",newifname); } } /* rename it now to its final target if its not already there */ if (event->name != NULL && !streq(event->name, newifname)) { r = rename_netif_dev_fromname_toname(dev,newifname,event->name); if (r == 0) finalifname = event->name; } } else { /* no need to rename to a tempname first, do a regular direct rename to event->name */ r = 1; /* skip the post-rename stuff if no rename occurs */ if (!streq(event->name, udev_device_get_sysname(dev))) r = rename_netif(event); } if (r == 0) { log_debug("renamed netif to '%s'\n", finalifname); r = udev_device_rename(dev, finalifname); #else if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") && event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) { int r; r = rename_netif(event); if (r < 0) log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name); else { r = udev_device_rename(dev, event->name); #endif if (r < 0) log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m", udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name); else log_debug("changed devpath to '%s'", udev_device_get_devpath(dev)); } } if (major(udev_device_get_devnum(dev)) > 0) { bool apply; /* remove/update possible left-over symlinks from old database entry */ if (event->dev_db != NULL) udev_node_update_old_links(dev, event->dev_db); if (!event->owner_set) event->uid = udev_device_get_devnode_uid(dev); if (!event->group_set) event->gid = udev_device_get_devnode_gid(dev); if (!event->mode_set) { if (udev_device_get_devnode_mode(dev) > 0) { /* kernel supplied value */ event->mode = udev_device_get_devnode_mode(dev); } else if (event->gid > 0) { /* default 0660 if a group is assigned */ event->mode = 0660; } else { /* default 0600 */ event->mode = 0600; } } apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set; udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list); } /* preserve old, or get new initialization timestamp */ udev_device_ensure_usec_initialized(event->dev, event->dev_db); /* (re)write database file */ udev_device_tag_index(dev, event->dev_db, true); udev_device_update_db(dev); udev_device_set_is_initialized(dev); event->dev_db = udev_device_unref(event->dev_db); } } void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) { struct udev_list_entry *list_entry; udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) { const char *cmd = udev_list_entry_get_name(list_entry); enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry); if (builtin_cmd < UDEV_BUILTIN_MAX) { char command[UTIL_PATH_SIZE]; udev_event_apply_format(event, cmd, command, sizeof(command), false); udev_builtin_run(event->dev, builtin_cmd, command, false); } else { char program[UTIL_PATH_SIZE]; char **envp; if (event->exec_delay > 0) { log_debug("delay execution of '%s'", program); sleep(event->exec_delay); } udev_event_apply_format(event, cmd, program, sizeof(program), false); envp = udev_device_get_properties_envp(event->dev); udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0); } } }