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authorDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-04-12 05:13:42 +0200
committerDavid Oberhollenzer <david.oberhollenzer@tele2.at>2018-04-12 09:31:55 +0200
commit24043cc4eedd11bca8adc27491aafe80e14a8a86 (patch)
tree8d22cfb6764502d2cd2700efbe354024b9a3cb57
parent38ad6f1b2f8137226382a2a029ba37f1a173807a (diff)
Add service command that dumps the command lines of a service file
Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
-rw-r--r--servicecmd/Makemodule.am3
-rw-r--r--servicecmd/dumpscript.c182
2 files changed, 184 insertions, 1 deletions
diff --git a/servicecmd/Makemodule.am b/servicecmd/Makemodule.am
index fd671b6..7b85e3f 100644
--- a/servicecmd/Makemodule.am
+++ b/servicecmd/Makemodule.am
@@ -1,7 +1,8 @@
SRVHEADERS = servicecmd/servicecmd.h
service_SOURCES = servicecmd/servicecmd.c servicecmd/help.c servicecmd/list.c
-service_SOURCES += servicecmd/enable.c servicecmd/disable.c $(SRVHEADERS)
+service_SOURCES += servicecmd/enable.c servicecmd/disable.c
+service_SOURCES += servicecmd/dumpscript.c $(SRVHEADERS)
service_CPPFLAGS = $(AM_CPPFLAGS)
service_CFLAGS = $(AM_CFLAGS)
service_LDFLAGS = $(AM_LDFLAGS)
diff --git a/servicecmd/dumpscript.c b/servicecmd/dumpscript.c
new file mode 100644
index 0000000..880631f
--- /dev/null
+++ b/servicecmd/dumpscript.c
@@ -0,0 +1,182 @@
+/* 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 <fcntl.h>
+#include <errno.h>
+
+#include "servicecmd.h"
+#include "service.h"
+
+static service_t *try_load(const char *directory, const char *filename)
+{
+ int dirfd, type;
+ struct stat sb;
+ service_t *svc;
+
+ dirfd = open(directory, O_RDONLY | O_DIRECTORY);
+
+ if (dirfd < 0) {
+ perror(directory);
+ return NULL;
+ }
+
+ if (fstatat(dirfd, filename, &sb, AT_SYMLINK_NOFOLLOW)) {
+ fprintf(stderr, "stat %s/%s: %s\n",
+ directory, filename, strerror(errno));
+ close(dirfd);
+ return NULL;
+ }
+
+ type = (sb.st_mode & S_IFMT);
+
+ if (type != S_IFREG && type != S_IFLNK)
+ return NULL;
+
+ svc = rdsvc(dirfd, filename);
+ close(dirfd);
+ return svc;
+}
+
+enum {
+ NEED_QUOTES = 0x01,
+ NEED_ESCAPE = 0x02,
+};
+
+static int check_str(const char *str)
+{
+ int ret = 0;
+
+ while (*str != '\0') {
+ if (isspace(*str))
+ ret |= NEED_QUOTES;
+
+ if (!isascii(*str) || !isprint(*str))
+ ret |= NEED_ESCAPE | NEED_QUOTES;
+
+ if (*str == '\\' || *str == '"' || *str == '\n')
+ ret |= NEED_ESCAPE | NEED_QUOTES;
+
+ ++str;
+ }
+
+ return ret;
+}
+
+static void print_str(const char *str)
+{
+ int flags = check_str(str);
+
+ if (flags & NEED_QUOTES)
+ fputc('"', stdout);
+
+ if (flags & NEED_ESCAPE) {
+ while (*str != '\0') {
+ switch (*str) {
+ case '\a': fputs("\\a", stdout); break;
+ case '\b': fputs("\\b", stdout); break;
+ case '\f': fputs("\\f", stdout); break;
+ case '\r': fputs("\\r", stdout); break;
+ case '\t': fputs("\\t", stdout); break;
+ case '\n': fputs("\\n", stdout); break;
+ case '\\':
+ case '"':
+ fprintf(stdout, "\\%c", *str);
+ break;
+ default:
+ if (!isascii(*str) || !isprint(*str)) {
+ fprintf(stdout, "\\x%02X", *str);
+ } else {
+ fputc(*str, stdout);
+ }
+ break;
+ }
+ ++str;
+ }
+ } else {
+ fputs(str, stdout);
+ }
+
+ if (flags & NEED_QUOTES)
+ fputc('"', stdout);
+}
+
+static int cmd_dumpscript(int argc, char **argv)
+{
+ char *filename, *ptr;
+ service_t *svc;
+ size_t len;
+ exec_t *e;
+ int i;
+
+ if (check_arguments(argv[0], argc, 2, 3))
+ return EXIT_FAILURE;
+
+ for (len = 1, i = 1; i < argc; ++i)
+ len += strlen(argv[i]) + 1;
+
+ filename = alloca(len);
+ filename[0] = '\0';
+
+ for (i = 1; i < argc; ++i) {
+ if (i > 1)
+ strcat(filename, "@");
+ strcat(filename, argv[i]);
+ }
+
+ svc = try_load(SVCDIR, filename);
+
+ if (svc == NULL) {
+ fprintf(stderr, "Could not load service '%s'\n", filename);
+ return EXIT_FAILURE;
+ }
+
+ fprintf(stdout, "#\n# commands executed for serice '%s'\n#\n",
+ filename);
+
+ for (e = svc->exec; e != NULL; e = e->next) {
+ ptr = e->args;
+
+ for (i = 0; i < e->argc; ++i) {
+ if (i)
+ fputc(' ', stdout);
+
+ print_str(ptr);
+ ptr += strlen(ptr) + 1;
+ }
+
+ putchar('\n');
+ }
+
+ delsvc(svc);
+ return EXIT_SUCCESS;
+}
+
+static command_t dumpscript = {
+ .cmd = "dumpscript",
+ .usage = "<name> [arguments]",
+ .s_desc = "print commands executed for a service",
+ .l_desc = "This parses a service file from " SVCDIR " and "
+ "produces a pseudo-shell-script containing the "
+ "exact commands after argument expansion that init "
+ "runs when starting the service.",
+ .run_cmd = cmd_dumpscript,
+};
+
+REGISTER_COMMAND(dumpscript)