2 Unix SMB/CIFS mplementation.
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];
83 req = tevent_req_create(mem_ctx, &state,
84 struct samba_runcmd_state);
89 state->stdout_log_level = stdout_log_level;
90 state->stderr_log_level = stderr_log_level;
93 state->arg0 = talloc_strdup(state, argv0[0]);
94 if (tevent_req_nomem(state->arg0, req)) {
95 return tevent_req_post(req, ev);
99 tevent_req_error(req, errno);
100 return tevent_req_post(req, ev);
105 tevent_req_error(req, errno);
106 return tevent_req_post(req, ev);
113 tevent_req_error(req, errno);
114 return tevent_req_post(req, ev);
118 if (state->pid == (pid_t)-1) {
125 tevent_req_error(req, errno);
126 return tevent_req_post(req, ev);
129 if (state->pid != 0) {
134 state->fd_stdout = p1[0];
135 state->fd_stderr = p2[0];
136 state->fd_stdin = p3[1];
138 set_blocking(state->fd_stdout, false);
139 set_blocking(state->fd_stderr, false);
140 set_blocking(state->fd_stdin, false);
142 smb_set_close_on_exec(state->fd_stdin);
143 smb_set_close_on_exec(state->fd_stdout);
144 smb_set_close_on_exec(state->fd_stderr);
146 talloc_set_destructor(state, samba_runcmd_state_destructor);
148 state->fde_stdout = tevent_add_fd(ev, state,
151 samba_runcmd_io_handler,
153 if (tevent_req_nomem(state->fde_stdout, req)) {
154 close(state->fd_stdout);
155 close(state->fd_stderr);
156 return tevent_req_post(req, ev);
158 tevent_fd_set_auto_close(state->fde_stdout);
160 state->fde_stderr = tevent_add_fd(ev, state,
163 samba_runcmd_io_handler,
165 if (tevent_req_nomem(state->fde_stdout, req)) {
166 close(state->fd_stderr);
167 return tevent_req_post(req, ev);
169 tevent_fd_set_auto_close(state->fde_stderr);
171 if (!timeval_is_zero(&endtime)) {
172 tevent_req_set_endtime(req, ev, endtime);
186 /* we want to ensure that all of the network sockets we had
188 tevent_re_initialise(ev);
190 /* setup for logging to go to the parents debug log */
199 argv = str_list_copy(state, discard_const_p(const char *, argv0));
201 fprintf(stderr, "Out of memory in child\n");
207 char *arg = va_arg(ap, char *);
208 if (arg == NULL) break;
209 argv = discard_const_p(char *, str_list_add((const char **)argv, arg));
211 fprintf(stderr, "Out of memory in child\n");
217 (void)execvp(state->arg0, argv);
218 fprintf(stderr, "Failed to exec child - %s\n", strerror(errno));
224 handle stdout/stderr from the child
226 static void samba_runcmd_io_handler(struct tevent_context *ev,
227 struct tevent_fd *fde,
231 struct tevent_req *req = talloc_get_type_abort(private_data,
233 struct samba_runcmd_state *state = tevent_req_data(req,
234 struct samba_runcmd_state);
239 if (fde == state->fde_stdout) {
240 level = state->stdout_log_level;
241 fd = state->fd_stdout;
242 } else if (fde == state->fde_stderr) {
243 level = state->stderr_log_level;
244 fd = state->fd_stderr;
249 if (!(flags & TEVENT_FD_READ)) {
253 n = read(fd, &state->buf[state->buf_used],
254 sizeof(state->buf) - state->buf_used);
256 state->buf_used += n;
258 if (fde == state->fde_stdout) {
260 state->fde_stdout = NULL;
262 if (fde == state->fde_stderr) {
264 state->fde_stderr = NULL;
266 if (state->fde_stdout == NULL &&
267 state->fde_stderr == NULL) {
269 /* the child has closed both stdout and
270 * stderr, assume its dead */
271 pid_t pid = waitpid(state->pid, &status, 0);
272 if (pid != state->pid) {
273 if (errno == ECHILD) {
274 /* this happens when the
275 parent has set SIGCHLD to
276 SIG_IGN. In that case we
278 information for the child
279 via its logging. We should
280 stop using SIG_IGN on
281 SIGCHLD in the standard
284 tevent_req_done(req);
287 DEBUG(0,("Error in waitpid() for child %s - %s \n",
288 state->arg0, strerror(errno)));
292 tevent_req_error(req, errno);
295 status = WEXITSTATUS(status);
296 DEBUG(3,("Child %s exited with status %d - %s\n",
297 state->arg0, status, strerror(status)));
299 tevent_req_error(req, status);
303 tevent_req_done(req);
309 while (state->buf_used > 0 &&
310 (p = (char *)memchr(state->buf, '\n', state->buf_used)) != NULL) {
311 int n1 = (p - state->buf)+1;
313 /* swallow \r from child processes */
314 if (n2 > 0 && state->buf[n2-1] == '\r') {
317 DEBUG(level,("%s: %*.*s\n", state->arg0, n2, n2, state->buf));
318 memmove(state->buf, p+1, sizeof(state->buf) - n1);
319 state->buf_used -= n1;
322 /* the buffer could have completely filled - unfortunately we have
323 no choice but to dump it out straight away */
324 if (state->buf_used == sizeof(state->buf)) {
325 DEBUG(level,("%s: %*.*s\n",
326 state->arg0, state->buf_used,
327 state->buf_used, state->buf));
332 int samba_runcmd_recv(struct tevent_req *req, int *perrno)
334 if (tevent_req_is_unix_error(req, perrno)) {
335 tevent_req_received(req);
339 tevent_req_received(req);