2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2010
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 this runs a child command with stdout and stderr going to the Samba
29 #include "system/filesys.h"
31 #include "../lib/util/tevent_unix.h"
33 struct samba_runcmd_state {
36 struct tevent_fd *fde_stdout;
37 struct tevent_fd *fde_stderr;
38 int fd_stdin, fd_stdout, fd_stderr;
45 static int samba_runcmd_state_destructor(struct samba_runcmd_state *state)
48 kill(state->pid, SIGKILL);
49 waitpid(state->pid, NULL, 0);
53 if (state->fd_stdin != -1) {
54 close(state->fd_stdin);
59 static void samba_runcmd_io_handler(struct tevent_context *ev,
60 struct tevent_fd *fde,
65 run a command as a child process, with a timeout.
67 any stdout/stderr from the child will appear in the Samba logs with
68 the specified log levels
70 struct tevent_req *samba_runcmd_send(TALLOC_CTX *mem_ctx,
71 struct tevent_context *ev,
72 struct timeval endtime,
75 const char * const *argv0, ...)
77 struct tevent_req *req;
78 struct samba_runcmd_state *state;
79 int p1[2], p2[2], p3[2];
87 req = tevent_req_create(mem_ctx, &state,
88 struct samba_runcmd_state);
93 state->stdout_log_level = stdout_log_level;
94 state->stderr_log_level = stderr_log_level;
97 state->arg0 = talloc_strdup(state, argv0[0]);
98 if (tevent_req_nomem(state->arg0, req)) {
99 return tevent_req_post(req, ev);
103 tevent_req_error(req, errno);
104 return tevent_req_post(req, ev);
109 tevent_req_error(req, errno);
110 return tevent_req_post(req, ev);
117 tevent_req_error(req, errno);
118 return tevent_req_post(req, ev);
122 if (state->pid == (pid_t)-1) {
129 tevent_req_error(req, errno);
130 return tevent_req_post(req, ev);
133 if (state->pid != 0) {
138 state->fd_stdout = p1[0];
139 state->fd_stderr = p2[0];
140 state->fd_stdin = p3[1];
142 set_blocking(state->fd_stdout, false);
143 set_blocking(state->fd_stderr, false);
144 set_blocking(state->fd_stdin, false);
146 smb_set_close_on_exec(state->fd_stdin);
147 smb_set_close_on_exec(state->fd_stdout);
148 smb_set_close_on_exec(state->fd_stderr);
150 talloc_set_destructor(state, samba_runcmd_state_destructor);
152 state->fde_stdout = tevent_add_fd(ev, state,
155 samba_runcmd_io_handler,
157 if (tevent_req_nomem(state->fde_stdout, req)) {
158 close(state->fd_stdout);
159 close(state->fd_stderr);
160 return tevent_req_post(req, ev);
162 tevent_fd_set_auto_close(state->fde_stdout);
164 state->fde_stderr = tevent_add_fd(ev, state,
167 samba_runcmd_io_handler,
169 if (tevent_req_nomem(state->fde_stdout, req)) {
170 close(state->fd_stderr);
171 return tevent_req_post(req, ev);
173 tevent_fd_set_auto_close(state->fde_stderr);
175 if (!timeval_is_zero(&endtime)) {
176 tevent_req_set_endtime(req, ev, endtime);
190 /* we want to ensure that all of the network sockets we had
192 tevent_re_initialise(ev);
194 /* setup for logging to go to the parents debug log */
203 argv = str_list_copy(state, discard_const_p(const char *, argv0));
205 fprintf(stderr, "Out of memory in child\n");
212 char *arg = va_arg(ap, char *);
213 if (arg == NULL) break;
214 l = discard_const_p(const char *, argv);
215 l = str_list_add(l, arg);
217 fprintf(stderr, "Out of memory in child\n");
220 argv = discard_const_p(char *, l);
224 (void)execvp(state->arg0, argv);
225 fprintf(stderr, "Failed to exec child - %s\n", strerror(errno));
231 handle stdout/stderr from the child
233 static void samba_runcmd_io_handler(struct tevent_context *ev,
234 struct tevent_fd *fde,
238 struct tevent_req *req = talloc_get_type_abort(private_data,
240 struct samba_runcmd_state *state = tevent_req_data(req,
241 struct samba_runcmd_state);
246 if (fde == state->fde_stdout) {
247 level = state->stdout_log_level;
248 fd = state->fd_stdout;
249 } else if (fde == state->fde_stderr) {
250 level = state->stderr_log_level;
251 fd = state->fd_stderr;
256 if (!(flags & TEVENT_FD_READ)) {
260 n = read(fd, &state->buf[state->buf_used],
261 sizeof(state->buf) - state->buf_used);
263 state->buf_used += n;
265 if (fde == state->fde_stdout) {
267 state->fde_stdout = NULL;
269 if (fde == state->fde_stderr) {
271 state->fde_stderr = NULL;
273 if (state->fde_stdout == NULL &&
274 state->fde_stderr == NULL) {
276 /* the child has closed both stdout and
277 * stderr, assume its dead */
278 pid_t pid = waitpid(state->pid, &status, 0);
279 if (pid != state->pid) {
280 if (errno == ECHILD) {
281 /* this happens when the
282 parent has set SIGCHLD to
283 SIG_IGN. In that case we
285 information for the child
286 via its logging. We should
287 stop using SIG_IGN on
288 SIGCHLD in the standard
291 DEBUG(0, ("Error in waitpid() unexpectedly got ECHILD "
292 "for %s child %d - %s, "
293 "someone has set SIGCHLD to SIG_IGN!\n",
294 state->arg0, (int)state->pid, strerror(errno)));
295 tevent_req_error(req, errno);
298 DEBUG(0,("Error in waitpid() for child %s - %s \n",
299 state->arg0, strerror(errno)));
303 tevent_req_error(req, errno);
306 status = WEXITSTATUS(status);
307 DEBUG(3,("Child %s exited with status %d - %s\n",
308 state->arg0, status, strerror(status)));
310 tevent_req_error(req, status);
314 tevent_req_done(req);
320 while (state->buf_used > 0 &&
321 (p = (char *)memchr(state->buf, '\n', state->buf_used)) != NULL) {
322 int n1 = (p - state->buf)+1;
324 /* swallow \r from child processes */
325 if (n2 > 0 && state->buf[n2-1] == '\r') {
328 DEBUG(level,("%s: %*.*s\n", state->arg0, n2, n2, state->buf));
329 memmove(state->buf, p+1, sizeof(state->buf) - n1);
330 state->buf_used -= n1;
333 /* the buffer could have completely filled - unfortunately we have
334 no choice but to dump it out straight away */
335 if (state->buf_used == sizeof(state->buf)) {
336 DEBUG(level,("%s: %*.*s\n",
337 state->arg0, state->buf_used,
338 state->buf_used, state->buf));
343 int samba_runcmd_recv(struct tevent_req *req, int *perrno)
345 if (tevent_req_is_unix_error(req, perrno)) {
346 tevent_req_received(req);
350 tevent_req_received(req);