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"
30 #include "lib/tevent/tevent.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_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);
55 static void samba_runcmd_io_handler(struct tevent_context *ev,
56 struct tevent_fd *fde,
61 run a command as a child process, with a timeout.
63 any stdout/stderr from the child will appear in the Samba logs with
64 the specified log levels
66 struct tevent_req *samba_runcmd_send(TALLOC_CTX *mem_ctx,
67 struct tevent_context *ev,
68 struct timeval endtime,
71 const char * const *argv0, ...)
73 struct tevent_req *req;
74 struct samba_runcmd_state *state;
80 req = tevent_req_create(mem_ctx, &state,
81 struct samba_runcmd_state);
86 state->stdout_log_level = stdout_log_level;
87 state->stderr_log_level = stderr_log_level;
89 state->arg0 = talloc_strdup(state, argv0[0]);
90 if (tevent_req_nomem(state->arg0, req)) {
91 return tevent_req_post(req, ev);
95 tevent_req_error(req, errno);
96 return tevent_req_post(req, ev);
101 tevent_req_error(req, errno);
102 return tevent_req_post(req, ev);
106 if (state->pid == (pid_t)-1) {
111 tevent_req_error(req, errno);
112 return tevent_req_post(req, ev);
115 if (state->pid != 0) {
119 state->fd_stdout = p1[0];
120 state->fd_stderr = p2[0];
121 set_blocking(state->fd_stdout, false);
122 set_blocking(state->fd_stderr, false);
124 talloc_set_destructor(state, samba_runcmd_state_destructor);
126 state->fde_stdout = tevent_add_fd(ev, state,
129 samba_runcmd_io_handler,
131 if (tevent_req_nomem(state->fde_stdout, req)) {
134 return tevent_req_post(req, ev);
136 tevent_fd_set_auto_close(state->fde_stdout);
138 state->fde_stderr = tevent_add_fd(ev, state,
141 samba_runcmd_io_handler,
143 if (tevent_req_nomem(state->fde_stdout, req)) {
145 return tevent_req_post(req, ev);
147 tevent_fd_set_auto_close(state->fde_stderr);
149 if (!timeval_is_zero(&endtime)) {
150 tevent_req_set_endtime(req, ev, endtime);
163 /* setup for logging to go to the parents debug log */
164 open("/dev/null", O_RDONLY); /* for stdin */
168 argv = str_list_copy(state, discard_const_p(const char *, argv0));
170 fprintf(stderr, "Out of memory in child\n");
176 char *arg = va_arg(ap, char *);
177 if (arg == NULL) break;
178 argv = discard_const_p(char *, str_list_add((const char **)argv, arg));
180 fprintf(stderr, "Out of memory in child\n");
186 ret = execvp(state->arg0, argv);
187 fprintf(stderr, "Failed to exec child - %s\n", strerror(errno));
193 handle stdout/stderr from the child
195 static void samba_runcmd_io_handler(struct tevent_context *ev,
196 struct tevent_fd *fde,
200 struct tevent_req *req = talloc_get_type_abort(private_data,
202 struct samba_runcmd_state *state = tevent_req_data(req,
203 struct samba_runcmd_state);
208 if (fde == state->fde_stdout) {
209 level = state->stdout_log_level;
210 fd = state->fd_stdout;
212 level = state->stderr_log_level;
213 fd = state->fd_stderr;
216 if (!(flags & TEVENT_FD_READ)) {
220 n = read(fd, &state->buf[state->buf_used],
221 sizeof(state->buf) - state->buf_used);
223 state->buf_used += n;
225 if (fde == state->fde_stdout) {
227 state->fde_stdout = NULL;
229 if (fde == state->fde_stderr) {
231 state->fde_stderr = NULL;
233 if (state->fde_stdout == NULL &&
234 state->fde_stderr == NULL) {
236 /* the child has closed both stdout and
237 * stderr, assume its dead */
238 pid_t pid = waitpid(state->pid, &status, 0);
239 if (pid != state->pid) {
240 DEBUG(0,("Error in waitpid() for child %s - %s \n",
241 state->arg0, strerror(errno)));
245 tevent_req_error(req, errno);
248 status = WEXITSTATUS(status);
249 DEBUG(3,("Child %s exited with status %d - %s\n",
250 state->arg0, status, strerror(status)));
252 tevent_req_error(req, status);
256 tevent_req_done(req);
262 while (state->buf_used > 0 &&
263 (p = (char *)memchr(state->buf, '\n', state->buf_used)) != NULL) {
264 int n1 = (p - state->buf)+1;
266 /* swallow \r from child processes */
267 if (n2 > 0 && state->buf[n2-1] == '\r') {
270 DEBUG(level,("%s: %*.*s\n", state->arg0, n2, n2, state->buf));
271 memmove(state->buf, p+1, sizeof(state->buf) - n1);
272 state->buf_used -= n1;
275 /* the buffer could have completely filled - unfortunately we have
276 no choice but to dump it out straight away */
277 if (state->buf_used == sizeof(state->buf)) {
278 DEBUG(level,("%s: %*.*s\n",
279 state->arg0, state->buf_used,
280 state->buf_used, state->buf));
285 int samba_runcmd_recv(struct tevent_req *req, int *perrno)
287 if (tevent_req_is_unix_error(req, perrno)) {
288 tevent_req_received(req);
292 tevent_req_received(req);