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authorDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-05-23 22:26:17 +0200
committerDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-06-09 15:32:29 +0200
commitbf63f78b6698f33ed3acbd4aed8822a35688c1ba (patch)
tree4e7c79326dd6fd217f135234dbcf3d9bc09ebb82 /lib/util/rdsvc.c
parent1eb8a4c792166360137cb5c83afa75eace2b4b1d (diff)
Split configuration parser and utility library
Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
Diffstat (limited to 'lib/util/rdsvc.c')
-rw-r--r--lib/util/rdsvc.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/lib/util/rdsvc.c b/lib/util/rdsvc.c
new file mode 100644
index 0000000..6a964f7
--- /dev/null
+++ b/lib/util/rdsvc.c
@@ -0,0 +1,357 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * 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 3 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 <https://www.gnu.org/licenses/>.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+#include "service.h"
+#include "libcfg.h"
+#include "util.h"
+
+static int try_unescape(char *arg, rdline_t *rd)
+{
+ if (unescape(arg)) {
+ fprintf(stderr, "%s: %zu: malformed string constant\n",
+ rd->filename, rd->lineno);
+ return -1;
+ }
+ return 0;
+}
+
+static char *try_strdup(const char *str, rdline_t *rd)
+{
+ char *out = strdup(str);
+
+ if (out == NULL) {
+ fprintf(stderr, "%s: %zu: out of memory\n",
+ rd->filename, rd->lineno);
+ }
+ return out;
+}
+
+static int try_pack_argv(char *str, rdline_t *rd)
+{
+ int count = pack_argv(str);
+ if (count < 0) {
+ fprintf(stderr, "%s: %zu: malformed string constant\n",
+ rd->filename, rd->lineno);
+ }
+ return count;
+}
+
+static int svc_desc(service_t *svc, char *arg, rdline_t *rd)
+{
+ if (try_unescape(arg, rd))
+ return -1;
+ svc->desc = try_strdup(arg, rd);
+ return svc->desc == NULL ? -1 : 0;
+}
+
+static int svc_tty(service_t *svc, char *arg, rdline_t *rd)
+{
+ if (try_unescape(arg, rd))
+ return -1;
+ svc->ctty = try_strdup(arg, rd);
+ return svc->ctty == NULL ? -1 : 0;
+}
+
+static int svc_exec(service_t *svc, char *arg, rdline_t *rd)
+{
+ exec_t *e, *end;
+
+ e = calloc(1, sizeof(*e) + strlen(arg) + 1);
+ if (e == NULL) {
+ fprintf(stderr, "%s: %zu: out of memory\n",
+ rd->filename, rd->lineno);
+ return -1;
+ }
+
+ strcpy(e->args, arg);
+
+ e->argc = try_pack_argv(e->args, rd);
+ if (e->argc < 0)
+ return -1;
+
+ if (svc->exec == NULL) {
+ svc->exec = e;
+ } else {
+ for (end = svc->exec; end->next != NULL; end = end->next)
+ ;
+ end->next = e;
+ }
+ return 0;
+}
+
+static int svc_before(service_t *svc, char *arg, rdline_t *rd)
+{
+ if (svc->before != NULL) {
+ fprintf(stderr, "%s: %zu: 'before' dependencies respecified\n",
+ rd->filename, rd->lineno);
+ return -1;
+ }
+
+ svc->before = try_strdup(arg, rd);
+ if (svc->before == NULL)
+ return -1;
+
+ svc->num_before = try_pack_argv(svc->before, rd);
+ return (svc->num_before < 0) ? -1 : 0;
+}
+
+static int svc_after(service_t *svc, char *arg, rdline_t *rd)
+{
+ if (svc->after != NULL) {
+ fprintf(stderr, "%s: %zu: 'after' dependencies respecified\n",
+ rd->filename, rd->lineno);
+ return -1;
+ }
+
+ svc->after = try_strdup(arg, rd);
+ if (svc->after == NULL)
+ return -1;
+
+ svc->num_after = try_pack_argv(svc->after, rd);
+ return (svc->num_after < 0) ? -1 : 0;
+}
+
+static int svc_type(service_t *svc, char *arg, rdline_t *rd)
+{
+ int count = try_pack_argv(arg, rd);
+
+ if (count < 1)
+ return -1;
+
+ svc->type = svc_type_from_string(arg);
+
+ if (svc->type == -1) {
+ fprintf(stderr, "%s: %zu: unknown service type '%s'\n",
+ rd->filename, rd->lineno, arg);
+ return -1;
+ }
+
+ if (count > 1) {
+ arg += strlen(arg) + 1;
+
+ switch (svc->type) {
+ case SVC_RESPAWN:
+ if (strcmp(arg, "limit") != 0)
+ goto fail_limit;
+ arg += strlen(arg) + 1;
+
+ if (count > 3)
+ goto fail_args;
+ if (!isdigit(*arg))
+ goto fail_limit;
+ svc->rspwn_limit = atoi(arg);
+ break;
+ default:
+ goto fail_args;
+ }
+ }
+
+ return 0;
+fail_args:
+ fprintf(stderr, "%s: %zu: unexpected extra arguments\n",
+ rd->filename, rd->lineno);
+ return -1;
+fail_limit:
+ fprintf(stderr, "%s: %zu: expected 'limit <value>' after 'respawn'\n",
+ rd->filename, rd->lineno);
+ return -1;
+}
+
+static int svc_target(service_t *svc, char *arg, rdline_t *rd)
+{
+ int target;
+
+ if (try_unescape(arg, rd))
+ return -1;
+
+ target = svc_target_from_string(arg);
+
+ if (target == -1) {
+ fprintf(stderr, "%s: %zu: unknown service target '%s'\n",
+ rd->filename, rd->lineno, arg);
+ return -1;
+ }
+
+ svc->target = target;
+ return 0;
+}
+
+static const struct svc_param {
+ const char *key;
+
+ unsigned int allow_block : 1;
+
+ int flags;
+
+ int (*handle)(service_t *svc, char *arg, rdline_t *rd);
+} svc_params[] = {
+ { "description", 0, 0, svc_desc },
+ { "exec", 1, RDSVC_NO_EXEC, svc_exec },
+ { "type", 0, 0, svc_type },
+ { "target", 0, 0, svc_target },
+ { "tty", 0, RDSVC_NO_CTTY, svc_tty },
+ { "before", 0, RDSVC_NO_DEPS, svc_before },
+ { "after", 0, RDSVC_NO_DEPS, svc_after },
+};
+
+static int splitkv(rdline_t *rd, char **k, char **v)
+{
+ char *key = rd->buffer, *value = rd->buffer;
+
+ while (*value != ' ' && *value != '\0') {
+ if (!isalpha(*value)) {
+ fprintf(stderr,
+ "%s: %zu: unexpected '%c' in keyword\n",
+ rd->filename, rd->lineno, *value);
+ return -1;
+ }
+ ++value;
+ }
+
+ if (*value != ' ') {
+ fprintf(stderr, "%s: %zu: expected argument after '%s'\n",
+ rd->filename, rd->lineno, key);
+ return -1;
+ }
+
+ *(value++) = '\0';
+
+ *k = key;
+ *v = value;
+ return 0;
+}
+
+static const struct svc_param *find_param(rdline_t *rd, const char *name)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(svc_params); ++i) {
+ if (!strcmp(svc_params[i].key, name))
+ return svc_params + i;
+ }
+
+ fprintf(stderr, "%s: %zu: unknown keyword '%s'\n",
+ rd->filename, rd->lineno, name);
+ return NULL;
+}
+
+
+service_t *rdsvc(int dirfd, const char *filename, int flags)
+{
+ const struct svc_param *p;
+ const char *arg, *args[1];
+ service_t *svc = NULL;
+ char *key, *value;
+ size_t argc, nlen;
+ rdline_t rd;
+ int fd, ret;
+
+ fd = openat(dirfd, filename, O_RDONLY);
+ if (fd < 0) {
+ perror(filename);
+ return NULL;
+ }
+
+ arg = strchr(filename, '@');
+ if (arg != NULL) {
+ args[0] = arg + 1;
+ argc = 1;
+ } else {
+ argc = 0;
+ }
+
+ rdline_init(&rd, fd, filename, argc, args);
+
+ nlen = (arg != NULL) ? (size_t)(arg - filename) : strlen(filename);
+
+ svc = calloc(1, sizeof(*svc) + nlen + 1);
+ if (svc == NULL)
+ goto fail_oom;
+
+ if (!(flags & RDSVC_NO_FNAME)) {
+ svc->fname = strdup(filename);
+ if (svc->fname == NULL)
+ goto fail_oom;
+ }
+
+ memcpy(svc->name, filename, nlen);
+
+ while ((ret = rdline(&rd)) == 0) {
+ if (splitkv(&rd, &key, &value))
+ goto fail;
+
+ p = find_param(&rd, key);
+ if (p == NULL)
+ goto fail;
+
+ if (p->allow_block && *value == '{') {
+ for (++value; *value == ' '; ++value)
+ ;
+
+ if (!(flags & p->flags)) {
+ if (*value != '\0' &&
+ p->handle(svc, value, &rd)) {
+ goto fail;
+ }
+ }
+
+ while ((ret = rdline(&rd)) == 0) {
+ if (strcmp(rd.buffer, "}") == 0)
+ break;
+ if (flags & p->flags)
+ continue;
+ if (p->handle(svc, rd.buffer, &rd))
+ goto fail;
+ }
+
+ if (ret < 0)
+ goto fail;
+ if (ret > 0)
+ goto fail_bra;
+ } else {
+ if (flags & p->flags)
+ continue;
+ if (p->handle(svc, value, &rd))
+ goto fail;
+ }
+ }
+
+ if (ret < 0)
+ goto fail;
+
+ close(fd);
+ return svc;
+fail_bra:
+ fprintf(stderr, "%s: missing '}' before end-of-file\n", filename);
+ goto fail;
+fail_oom:
+ fputs("out of memory\n", stderr);
+fail:
+ delsvc(svc);
+ close(fd);
+ return NULL;
+}