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#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <limits.h>
#include <fcntl.h>
#include <stdio.h>
#include <libdaemon/dlog.h>
#include <libdaemon/dsignal.h>
#include "exec.h"
int log_exec(const char *dir, const char *prog, const char *arg) {
pid_t pid;
int p[2];
unsigned n = 0;
static char buf[256];
int sigfd, r;
fd_set fds;
daemon_log(LOG_INFO, "Running '%s %s'", prog, arg);
if (pipe(p) < 0) {
daemon_log(LOG_ERR, "pipe() failed: %s", strerror(errno));
return -1;
}
if ((pid = fork()) < 0) {
daemon_log(LOG_ERR, "fork() failed: %s", strerror(errno));
return -1;
} else if (pid == 0) {
dup2(p[1], 1);
dup2(p[1], 2);
if (p[0] > 2)
close(p[0]);
if (p[1] > 2)
close(p[1]);
close(0);
open("/dev/null", O_RDONLY);
umask(0022); // Set up a sane umask
if (dir && chdir(dir) < 0) {
daemon_log(LOG_WARNING, "Failed to change to directory '%s'", dir);
chdir("/");
}
execl(prog, prog, arg, 0);
daemon_log(LOG_ERR, "execl(%s) failed: %s\n", prog, strerror(errno));
_exit(EXIT_FAILURE);
}
close(p[1]);
FD_ZERO(&fds);
FD_SET(p[0], &fds);
FD_SET(sigfd = daemon_signal_fd(), &fds);
n = 0;
for (;;) {
fd_set qfds = fds;
if (select(FD_SETSIZE, &qfds, NULL, NULL, NULL) < 0) {
if (errno == EINTR)
continue;
daemon_log(LOG_ERR, "select() failed: %s", strerror(errno));
return -1;
}
if (FD_ISSET(p[0], &qfds)) {
char c;
if (read(p[0], &c, 1) != 1)
break;
buf[n] = c;
if (c == '\n' || n >= sizeof(buf) - 2) {
if (c != '\n') n++;
buf[n] = 0;
if (buf[0])
daemon_log(LOG_INFO, "client: %s", buf);
n = 0;
} else
n++;
}
if (FD_ISSET(sigfd, &qfds)) {
int sig;
if ((sig = daemon_signal_next()) < 0) {
daemon_log(LOG_ERR, "daemon_signal_next(): %s", strerror(errno));
break;
}
if (sig != SIGCHLD) {
daemon_log(LOG_WARNING, "Killing child.");
kill(pid, SIGTERM);
}
break;
}
}
if (n > 0) {
buf[n] = 0;
daemon_log(LOG_WARNING, "client: %s", buf);
}
waitpid(pid, &r, 0);
close(p[0]);
if (!WIFEXITED(r) || WEXITSTATUS(r) != 0) {
daemon_log(LOG_ERR, "Program execution failed, return value is %i.", WEXITSTATUS(r));
return -1;
} else {
daemon_log(LOG_INFO, "Program executed successfully.");
return 0;
}
}
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