/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include "alloc-util.h" #include "dirent-util.h" #include "exit-status.h" #include "fd-util.h" #include "fileio.h" #include "generator.h" #include "hashmap.h" #include "hexdecoct.h" #include "install.h" #include "log.h" #include "main-func.h" #include "mkdir.h" #include "path-lookup.h" #include "path-util.h" #include "set.h" #include "special.h" #include "specifier.h" #include "stat-util.h" #include "string-util.h" #include "strv.h" #include "unit-name.h" #include "util.h" static const struct { const char *path; const char *target; } rcnd_table[] = { /* Standard SysV runlevels for start-up */ { "rc1.d", SPECIAL_RESCUE_TARGET }, { "rc2.d", SPECIAL_MULTI_USER_TARGET }, { "rc3.d", SPECIAL_MULTI_USER_TARGET }, { "rc4.d", SPECIAL_MULTI_USER_TARGET }, { "rc5.d", SPECIAL_GRAPHICAL_TARGET }, /* We ignore the SysV runlevels for shutdown here, as SysV services get default dependencies anyway, and that * means they are shut down anyway at system power off if running. */ }; static const char *arg_dest = NULL; typedef struct SysvStub { char *name; char *path; char *description; int sysv_start_priority; char *pid_file; char **before; char **after; char **wants; char **wanted_by; bool has_lsb; bool reload; bool loaded; } SysvStub; static void free_sysvstub(SysvStub *s) { if (!s) return; free(s->name); free(s->path); free(s->description); free(s->pid_file); strv_free(s->before); strv_free(s->after); strv_free(s->wants); strv_free(s->wanted_by); free(s); } DEFINE_TRIVIAL_CLEANUP_FUNC(SysvStub*, free_sysvstub); static void free_sysvstub_hashmapp(Hashmap **h) { hashmap_free_with_destructor(*h, free_sysvstub); } static int add_alias(const char *service, const char *alias) { const char *link; int r; assert(service); assert(alias); link = prefix_roota(arg_dest, alias); r = symlink(service, link); if (r < 0) { if (errno == EEXIST) return 0; return -errno; } return 1; } static int generate_unit_file(SysvStub *s) { _cleanup_free_ char *path_escaped = NULL; _cleanup_fclose_ FILE *f = NULL; const char *unit; char **p; int r; assert(s); if (!s->loaded) return 0; path_escaped = specifier_escape(s->path); if (!path_escaped) return log_oom(); unit = prefix_roota(arg_dest, s->name); /* We might already have a symlink with the same name from a Provides:, * or from backup files like /etc/init.d/foo.bak. Real scripts always win, * so remove an existing link */ if (is_symlink(unit) > 0) { log_warning("Overwriting existing symlink %s with real service.", unit); (void) unlink(unit); } f = fopen(unit, "wxe"); if (!f) return log_error_errno(errno, "Failed to create unit file %s: %m", unit); fprintf(f, "# Automatically generated by systemd-sysv-generator\n\n" "[Unit]\n" "Documentation=man:systemd-sysv-generator(8)\n" "SourcePath=%s\n", path_escaped); if (s->description) { _cleanup_free_ char *t; t = specifier_escape(s->description); if (!t) return log_oom(); fprintf(f, "Description=%s\n", t); } STRV_FOREACH(p, s->before) fprintf(f, "Before=%s\n", *p); STRV_FOREACH(p, s->after) fprintf(f, "After=%s\n", *p); STRV_FOREACH(p, s->wants) fprintf(f, "Wants=%s\n", *p); fprintf(f, "\n[Service]\n" "Type=forking\n" "Restart=no\n" "TimeoutSec=5min\n" "IgnoreSIGPIPE=no\n" "KillMode=process\n" "GuessMainPID=no\n" "RemainAfterExit=%s\n", yes_no(!s->pid_file)); if (s->pid_file) { _cleanup_free_ char *t; t = specifier_escape(s->pid_file); if (!t) return log_oom(); fprintf(f, "PIDFile=%s\n", t); } /* Consider two special LSB exit codes a clean exit */ if (s->has_lsb) fprintf(f, "SuccessExitStatus=%i %i\n", EXIT_NOTINSTALLED, EXIT_NOTCONFIGURED); fprintf(f, "ExecStart=%s start\n" "ExecStop=%s stop\n", path_escaped, path_escaped); if (s->reload) fprintf(f, "ExecReload=%s reload\n", path_escaped); r = fflush_and_check(f); if (r < 0) return log_error_errno(r, "Failed to write unit %s: %m", unit); STRV_FOREACH(p, s->wanted_by) (void) generator_add_symlink(arg_dest, *p, "wants", s->name); return 1; } static bool usage_contains_reload(const char *line) { return (strcasestr(line, "{reload|") || strcasestr(line, "{reload}") || strcasestr(line, "{reload\"") || strcasestr(line, "|reload|") || strcasestr(line, "|reload}") || strcasestr(line, "|reload\"")); } static char *sysv_translate_name(const char *name) { _cleanup_free_ char *c = NULL; char *res; c = strdup(name); if (!c) return NULL; res = endswith(c, ".sh"); if (res) *res = 0; if (unit_name_mangle(c, 0, &res) < 0) return NULL; return res; } static int sysv_translate_facility(SysvStub *s, unsigned line, const char *name, char **ret) { /* We silently ignore the $ prefix here. According to the LSB * spec it simply indicates whether something is a * standardized name or a distribution-specific one. Since we * just follow what already exists and do not introduce new * uses or names we don't care who introduced a new name. */ static const char * const table[] = { /* LSB defined facilities */ "local_fs", NULL, "network", SPECIAL_NETWORK_ONLINE_TARGET, "named", SPECIAL_NSS_LOOKUP_TARGET, "portmap", SPECIAL_RPCBIND_TARGET, "remote_fs", SPECIAL_REMOTE_FS_TARGET, "syslog", NULL, "time", SPECIAL_TIME_SYNC_TARGET, }; const char *filename; char *filename_no_sh, *e, *m; const char *n; unsigned i; int r; assert(name); assert(s); assert(ret); filename = basename(s->path); n = *name == '$' ? name + 1 : name; for (i = 0; i < ELEMENTSOF(table); i += 2) { if (!streq(table[i], n)) continue; if (!table[i+1]) { *ret = NULL; return 0; } m = strdup(table[i+1]); if (!m) return log_oom(); *ret = m; return 1; } /* If we don't know this name, fallback heuristics to figure * out whether something is a target or a service alias. */ /* Facilities starting with $ are most likely targets */ if (*name == '$') { r = unit_name_build(n, NULL, ".target", ret); if (r < 0) return log_error_errno(r, "[%s:%u] Could not build name for facility %s: %m", s->path, line, name); return 1; } /* Strip ".sh" suffix from file name for comparison */ filename_no_sh = strdupa(filename); e = endswith(filename_no_sh, ".sh"); if (e) { *e = '\0'; filename = filename_no_sh; } /* Names equaling the file name of the services are redundant */ if (streq_ptr(n, filename)) { *ret = NULL; return 0; } /* Everything else we assume to be normal service names */ m = sysv_translate_name(n); if (!m) return log_oom(); *ret = m; return 1; } static int handle_provides(SysvStub *s, unsigned line, const char *full_text, const char *text) { int r; assert(s); assert(full_text); assert(text); for (;;) { _cleanup_free_ char *word = NULL, *m = NULL; r = extract_first_word(&text, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX); if (r < 0) return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line); if (r == 0) break; r = sysv_translate_facility(s, line, word, &m); if (r <= 0) /* continue on error */ continue; switch (unit_name_to_type(m)) { case UNIT_SERVICE: log_debug("Adding Provides: alias '%s' for '%s'", m, s->name); r = add_alias(s->name, m); if (r < 0) log_warning_errno(r, "[%s:%u] Failed to add LSB Provides name %s, ignoring: %m", s->path, line, m); break; case UNIT_TARGET: /* NB: SysV targets which are provided by a * service are pulled in by the services, as * an indication that the generic service is * now available. This is strictly one-way. * The targets do NOT pull in SysV services! */ r = strv_extend(&s->before, m); if (r < 0) return log_oom(); r = strv_extend(&s->wants, m); if (r < 0) return log_oom(); if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET)) { r = strv_extend(&s->before, SPECIAL_NETWORK_TARGET); if (r < 0) return log_oom(); r = strv_extend(&s->wants, SPECIAL_NETWORK_TARGET); if (r < 0) return log_oom(); } break; case _UNIT_TYPE_INVALID: log_warning("Unit name '%s' is invalid", m); break; default: log_warning("Unknown unit type for unit '%s'", m); } } return 0; } static int handle_dependencies(SysvStub *s, unsigned line, const char *full_text, const char *text) { int r; assert(s); assert(full_text); assert(text); for (;;) { _cleanup_free_ char *word = NULL, *m = NULL; bool is_before; r = extract_first_word(&text, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX); if (r < 0) return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line); if (r == 0) break; r = sysv_translate_facility(s, line, word, &m); if (r <= 0) /* continue on error */ continue; is_before = startswith_no_case(full_text, "X-Start-Before:"); if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET) && !is_before) { /* the network-online target is special, as it needs to be actively pulled in */ r = strv_extend(&s->after, m); if (r < 0) return log_oom(); r = strv_extend(&s->wants, m); } else r = strv_extend(is_before ? &s->before : &s->after, m); if (r < 0) return log_oom(); } return 0; } static int load_sysv(SysvStub *s) { _cleanup_fclose_ FILE *f; unsigned line = 0; int r; enum { NORMAL, DESCRIPTION, LSB, LSB_DESCRIPTION, USAGE_CONTINUATION } state = NORMAL; _cleanup_free_ char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL; char *description; bool supports_reload = false; assert(s); f = fopen(s->path, "re"); if (!f) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open %s: %m", s->path); } log_debug("Loading SysV script %s", s->path); for (;;) { _cleanup_free_ char *l = NULL; char *t; r = read_line(f, LONG_LINE_MAX, &l); if (r < 0) return log_error_errno(r, "Failed to read configuration file '%s': %m", s->path); if (r == 0) break; line++; t = strstrip(l); if (*t != '#') { /* Try to figure out whether this init script supports * the reload operation. This heuristic looks for * "Usage" lines which include the reload option. */ if (state == USAGE_CONTINUATION || (state == NORMAL && strcasestr(t, "usage"))) { if (usage_contains_reload(t)) { supports_reload = true; state = NORMAL; } else if (t[strlen(t)-1] == '\\') state = USAGE_CONTINUATION; else state = NORMAL; } continue; } if (state == NORMAL && streq(t, "### BEGIN INIT INFO")) { state = LSB; s->has_lsb = true; continue; } if (IN_SET(state, LSB_DESCRIPTION, LSB) && streq(t, "### END INIT INFO")) { state = NORMAL; continue; } t++; t += strspn(t, WHITESPACE); if (state == NORMAL) { /* Try to parse Red Hat style description */ if (startswith_no_case(t, "description:")) { size_t k; const char *j; k = strlen(t); if (k > 0 && t[k-1] == '\\') { state = DESCRIPTION; t[k-1] = 0; } j = empty_to_null(strstrip(t+12)); r = free_and_strdup(&chkconfig_description, j); if (r < 0) return log_oom(); } else if (startswith_no_case(t, "pidfile:")) { const char *fn; state = NORMAL; fn = strstrip(t+8); if (!path_is_absolute(fn)) { log_error("[%s:%u] PID file not absolute. Ignoring.", s->path, line); continue; } r = free_and_strdup(&s->pid_file, fn); if (r < 0) return log_oom(); } } else if (state == DESCRIPTION) { /* Try to parse Red Hat style description * continuation */ size_t k; char *j; k = strlen(t); if (k > 0 && t[k-1] == '\\') t[k-1] = 0; else state = NORMAL; j = strstrip(t); if (!isempty(j)) { char *d = NULL; if (chkconfig_description) d = strjoin(chkconfig_description, " ", j); else d = strdup(j); if (!d) return log_oom(); free(chkconfig_description); chkconfig_description = d; } } else if (IN_SET(state, LSB, LSB_DESCRIPTION)) { if (startswith_no_case(t, "Provides:")) { state = LSB; r = handle_provides(s, line, t, t + 9); if (r < 0) return r; } else if (startswith_no_case(t, "Required-Start:") || startswith_no_case(t, "Should-Start:") || startswith_no_case(t, "X-Start-Before:") || startswith_no_case(t, "X-Start-After:")) { state = LSB; r = handle_dependencies(s, line, t, strchr(t, ':') + 1); if (r < 0) return r; } else if (startswith_no_case(t, "Description:")) { const char *j; state = LSB_DESCRIPTION; j = empty_to_null(strstrip(t+12)); r = free_and_strdup(&long_description, j); if (r < 0) return log_oom(); } else if (startswith_no_case(t, "Short-Description:")) { const char *j; state = LSB; j = empty_to_null(strstrip(t+18)); r = free_and_strdup(&short_description, j); if (r < 0) return log_oom(); } else if (state == LSB_DESCRIPTION) { if (startswith(l, "#\t") || startswith(l, "# ")) { const char *j; j = strstrip(t); if (!isempty(j)) { char *d = NULL; if (long_description) d = strjoin(long_description, " ", t); else d = strdup(j); if (!d) return log_oom(); free(long_description); long_description = d; } } else state = LSB; } } } s->reload = supports_reload; /* We use the long description only if * no short description is set. */ if (short_description) description = short_description; else if (chkconfig_description) description = chkconfig_description; else if (long_description) description = long_description; else description = NULL; if (description) { char *d; d = strjoin(s->has_lsb ? "LSB: " : "SYSV: ", description); if (!d) return log_oom(); s->description = d; } s->loaded = true; return 0; } static int fix_order(SysvStub *s, Hashmap *all_services) { SysvStub *other; Iterator j; int r; assert(s); if (!s->loaded) return 0; if (s->sysv_start_priority < 0) return 0; HASHMAP_FOREACH(other, all_services, j) { if (s == other) continue; if (!other->loaded) continue; if (other->sysv_start_priority < 0) continue; /* If both units have modern headers we don't care * about the priorities */ if (s->has_lsb && other->has_lsb) continue; if (other->sysv_start_priority < s->sysv_start_priority) { r = strv_extend(&s->after, other->name); if (r < 0) return log_oom(); } else if (other->sysv_start_priority > s->sysv_start_priority) { r = strv_extend(&s->before, other->name); if (r < 0) return log_oom(); } else continue; /* FIXME: Maybe we should compare the name here lexicographically? */ } return 0; } static int acquire_search_path(const char *def, const char *envvar, char ***ret) { _cleanup_strv_free_ char **l = NULL; const char *e; int r; assert(def); assert(envvar); e = getenv(envvar); if (e) { r = path_split_and_make_absolute(e, &l); if (r < 0) return log_error_errno(r, "Failed to make $%s search path absolute: %m", envvar); } if (strv_isempty(l)) { strv_free(l); l = strv_new(def); if (!l) return log_oom(); } if (!path_strv_resolve_uniq(l, NULL)) return log_oom(); *ret = TAKE_PTR(l); return 0; } static int enumerate_sysv(const LookupPaths *lp, Hashmap *all_services) { _cleanup_strv_free_ char **sysvinit_path = NULL; char **path; int r; assert(lp); r = acquire_search_path(SYSTEM_SYSVINIT_PATH, "SYSTEMD_SYSVINIT_PATH", &sysvinit_path); if (r < 0) return r; STRV_FOREACH(path, sysvinit_path) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; d = opendir(*path); if (!d) { if (errno != ENOENT) log_warning_errno(errno, "Opening %s failed, ignoring: %m", *path); continue; } FOREACH_DIRENT(de, d, log_error_errno(errno, "Failed to enumerate directory %s, ignoring: %m", *path)) { _cleanup_free_ char *fpath = NULL, *name = NULL; _cleanup_(free_sysvstubp) SysvStub *service = NULL; struct stat st; if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { log_warning_errno(errno, "stat() failed on %s/%s, ignoring: %m", *path, de->d_name); continue; } if (!(st.st_mode & S_IXUSR)) continue; if (!S_ISREG(st.st_mode)) continue; name = sysv_translate_name(de->d_name); if (!name) return log_oom(); if (hashmap_contains(all_services, name)) continue; r = unit_file_exists(UNIT_FILE_SYSTEM, lp, name); if (r < 0 && !IN_SET(r, -ELOOP, -ERFKILL, -EADDRNOTAVAIL)) { log_debug_errno(r, "Failed to detect whether %s exists, skipping: %m", name); continue; } else if (r != 0) { log_debug("Native unit for %s already exists, skipping.", name); continue; } fpath = path_join(*path, de->d_name); if (!fpath) return log_oom(); service = new0(SysvStub, 1); if (!service) return log_oom(); service->sysv_start_priority = -1; service->name = TAKE_PTR(name); service->path = TAKE_PTR(fpath); r = hashmap_put(all_services, service->name, service); if (r < 0) return log_oom(); service = NULL; } } return 0; } static int set_dependencies_from_rcnd(const LookupPaths *lp, Hashmap *all_services) { Set *runlevel_services[ELEMENTSOF(rcnd_table)] = {}; _cleanup_strv_free_ char **sysvrcnd_path = NULL; SysvStub *service; unsigned i; Iterator j; char **p; int r; assert(lp); r = acquire_search_path(SYSTEM_SYSVRCND_PATH, "SYSTEMD_SYSVRCND_PATH", &sysvrcnd_path); if (r < 0) return r; STRV_FOREACH(p, sysvrcnd_path) { for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) { _cleanup_closedir_ DIR *d = NULL; _cleanup_free_ char *path = NULL; struct dirent *de; path = path_join(*p, rcnd_table[i].path); if (!path) { r = log_oom(); goto finish; } d = opendir(path); if (!d) { if (errno != ENOENT) log_warning_errno(errno, "Opening %s failed, ignoring: %m", path); continue; } FOREACH_DIRENT(de, d, log_error_errno(errno, "Failed to enumerate directory %s, ignoring: %m", path)) { _cleanup_free_ char *name = NULL, *fpath = NULL; int a, b; if (de->d_name[0] != 'S') continue; if (strlen(de->d_name) < 4) continue; a = undecchar(de->d_name[1]); b = undecchar(de->d_name[2]); if (a < 0 || b < 0) continue; fpath = path_join(*p, de->d_name); if (!fpath) { r = log_oom(); goto finish; } name = sysv_translate_name(de->d_name + 3); if (!name) { r = log_oom(); goto finish; } service = hashmap_get(all_services, name); if (!service) { log_debug("Ignoring %s symlink in %s, not generating %s.", de->d_name, rcnd_table[i].path, name); continue; } service->sysv_start_priority = MAX(a*10 + b, service->sysv_start_priority); r = set_ensure_allocated(&runlevel_services[i], NULL); if (r < 0) { log_oom(); goto finish; } r = set_put(runlevel_services[i], service); if (r < 0) { log_oom(); goto finish; } } } } for (i = 0; i < ELEMENTSOF(rcnd_table); i ++) SET_FOREACH(service, runlevel_services[i], j) { r = strv_extend(&service->before, rcnd_table[i].target); if (r < 0) { log_oom(); goto finish; } r = strv_extend(&service->wanted_by, rcnd_table[i].target); if (r < 0) { log_oom(); goto finish; } } r = 0; finish: for (i = 0; i < ELEMENTSOF(rcnd_table); i++) set_free(runlevel_services[i]); return r; } static int run(const char *dest, const char *dest_early, const char *dest_late) { _cleanup_(free_sysvstub_hashmapp) Hashmap *all_services = NULL; _cleanup_(lookup_paths_free) LookupPaths lp = {}; SysvStub *service; Iterator j; int r; assert_se(arg_dest = dest_late); r = lookup_paths_init(&lp, UNIT_FILE_SYSTEM, LOOKUP_PATHS_EXCLUDE_GENERATED, NULL); if (r < 0) return log_error_errno(r, "Failed to find lookup paths: %m"); all_services = hashmap_new(&string_hash_ops); if (!all_services) return log_oom(); r = enumerate_sysv(&lp, all_services); if (r < 0) return r; r = set_dependencies_from_rcnd(&lp, all_services); if (r < 0) return r; HASHMAP_FOREACH(service, all_services, j) (void) load_sysv(service); HASHMAP_FOREACH(service, all_services, j) { (void) fix_order(service, all_services); (void) generate_unit_file(service); } return 0; } DEFINE_MAIN_GENERATOR_FUNCTION(run);