common plugin code, removed clixon_proc.c
This commit is contained in:
Olof hagsand
parent
2758a30bb7
commit
85af4342dc
13 changed files with 142 additions and 542 deletions
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@ -1,293 +0,0 @@
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/*
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*
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***** BEGIN LICENSE BLOCK *****
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Copyright (C) 2009-2017 Olof Hagsand and Benny Holmgren
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This file is part of CLIXON.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 3 or later (the "GPL"),
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in which case the provisions of the GPL are applicable instead
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of those above. If you wish to allow use of your version of this file only
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under the terms of the GPL, and not to allow others to
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use your version of this file under the terms of Apache License version 2,
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indicate your decision by deleting the provisions above and replace them with
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the notice and other provisions required by the GPL. If you do not delete
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the provisions above, a recipient may use your version of this file under
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the terms of any one of the Apache License version 2 or the GPL.
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***** END LICENSE BLOCK *****
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*/
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#ifdef HAVE_CONFIG_H
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#include "clixon_config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <grp.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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/* clicon */
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#include "clixon_err.h"
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#include "clixon_log.h"
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#include "clixon_sig.h"
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#include "clixon_string.h"
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#include "clixon_queue.h"
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#include "clixon_proc.h"
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/*
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* Macros
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*/
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#define signal_set_mask(set) sigprocmask(SIG_SETMASK, (set), NULL)
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#define signal_get_mask(set) sigprocmask (0, NULL, (set))
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/*
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* Child process ID
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* XXX Really shouldn't be a global variable
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*/
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static int _clicon_proc_child = 0;
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/*
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* Make sure child is killed by ctrl-C
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*/
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static void
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clicon_proc_sigint(int sig)
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{
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if (_clicon_proc_child > 0)
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kill (_clicon_proc_child, SIGINT);
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}
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/*! Fork a child process, setup a pipe between parent and child.
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* Allowing parent to read the output of the child.
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* @param[in] doerr If non-zero, stderr will be directed to the pipe as well.
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* The pipe for the parent to write
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* to the child is closed and cannot be used.
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*
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* When child process is done with the pipe setup, execute the specified
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* command, execv(argv[0], argv).
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*
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* When parent is done with the pipe setup it will read output from the child
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* until eof. The read output will be sent to the specified output callback,
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* 'outcb' function.
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*
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* @retval number Matches (processes affected).
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* @retval -1 Error.
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*/
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int
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clicon_proc_run (char *cmd,
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void (outcb)(char *),
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int doerr)
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{
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char
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**argv,
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buf[512];
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int
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outfd[2] = { -1, -1 };
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int
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n,
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argc,
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status,
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retval = -1;
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pid_t
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child;
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sigfn_t oldhandler = NULL;
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sigset_t oset;
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argv = clicon_strsep(cmd, " \t", &argc);
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if (!argv)
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return -1;
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if (pipe (outfd) == -1)
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goto done;
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signal_get_mask(&oset);
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set_signal(SIGINT, clicon_proc_sigint, &oldhandler);
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if ((child = fork ()) < 0) {
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retval = -1;
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goto done;
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}
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if (child == 0) { /* Child */
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/* Unblock all signals except TSTP */
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clicon_signal_unblock (0);
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signal (SIGTSTP, SIG_IGN);
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close (outfd[0]); /* Close unused read ends */
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outfd[0] = -1;
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/* Divert stdout and stderr to pipes */
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dup2 (outfd[1], STDOUT_FILENO);
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if (doerr)
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dup2 (outfd[1], STDERR_FILENO);
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execvp (argv[0], argv);
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perror("execvp");
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_exit(-1);
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}
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/* Parent */
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/* Close unused write ends */
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close (outfd[1]);
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outfd[1] = -1;
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/* Read from pipe */
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while ((n = read (outfd[0], buf, sizeof (buf)-1)) != 0) {
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if (n < 0) {
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if (errno == EINTR)
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continue;
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break;
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}
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buf[n] = '\0';
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/* Pass read data to callback function is defined */
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if (outcb)
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outcb (buf);
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}
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/* Wait for child to finish */
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if(waitpid (child, &status, 0) == child)
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retval = WEXITSTATUS(status);
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else
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retval = -1;
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done:
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/* Clean up all pipes */
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if (outfd[0] != -1)
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close (outfd[0]);
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if (outfd[1] != -1)
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close (outfd[1]);
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/* Restore sigmask and fn */
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signal_set_mask (&oset);
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set_signal(SIGINT, oldhandler, NULL);
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if(argv)
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free(argv);
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return retval;
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}
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/*! Spawn command and report exit status
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*/
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int
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clicon_proc_daemon (char *cmd)
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{
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char
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**argv;
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int
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i,
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argc,
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retval = -1,
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status, status2;
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pid_t
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child,
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pid;
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struct rlimit
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rlim;
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argv = clicon_strsep(cmd, " \t", &argc);
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if (!argv)
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return -1;
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if ((child = fork ()) < 0) {
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clicon_err(OE_UNIX, errno, "fork");
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goto done;
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}
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if (child == 0) { /* Child */
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clicon_signal_unblock (0);
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if ((pid = fork ()) < 0) {
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clicon_err(OE_UNIX, errno, "fork");
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return -1;
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_exit(1);
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}
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if (pid == 0) { /* Grandchild, create new session */
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setsid();
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if (chdir("/") < 0){
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clicon_err(OE_UNIX, errno, "chdirq");
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_exit(1);
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}
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/* Close open descriptors */
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if ( ! getrlimit (RLIMIT_NOFILE, &rlim))
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for (i = 0; i < rlim.rlim_cur; i++)
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close(i);
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if (execv (argv[0], argv) < 0) {
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clicon_err(OE_UNIX, errno, "execv");
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_exit(1);
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}
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/* Not reached */
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}
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waitpid (pid, &status2, 0);
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_exit(status2);
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}
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if (waitpid (child, &status, 0) > 0)
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retval = 0;
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done:
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if (argv)
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free(argv);
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return (retval);
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}
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/*! Translate group name to gid. Return -1 if error or not found.
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*/
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int
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group_name2gid(char *name, gid_t *gid)
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{
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char buf[1024];
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struct group g0;
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struct group *gr = &g0;
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struct group *gtmp;
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gr = &g0;
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/* This leaks memory in ubuntu */
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if (getgrnam_r(name, gr, buf, sizeof(buf), >mp) < 0){
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clicon_err(OE_UNIX, errno, "%s: getgrnam_r(%s): %s",
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__FUNCTION__, name, strerror(errno));
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return -1;
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}
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if (gtmp == NULL){
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clicon_err(OE_UNIX, 0, "%s: No such group: %s", __FUNCTION__, name);
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fprintf(stderr, "No such group %s\n", name);
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return -1;
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}
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if (gid)
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*gid = gr->gr_gid;
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return 0;
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}
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