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/*
* shell.c - Call external programs via the shell.
*
* Copyright (c) 1999 Mike Jagdis.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*/
#include "diald.h"
int
run_shell(int mode, const char *name, const char *buf, int d)
{
int d2, p[2];
pid_t pid;
FILE *fd;
block_signals();
if (debug&DEBUG_VERBOSE)
mon_syslog(LOG_DEBUG,"running '%s'",buf);
if (pipe(p))
p[0] = p[1] = -1;
pid = fork();
if (pid < 0) {
unblock_signals();
mon_syslog(LOG_ERR, "failed to fork and run '%s': %m",buf);
return -1;
}
if (pid == 0) {
if (d >= 0) {
/* Run in a new process group and foreground ourselves
* on the tty (SIGTTOU is ignored).
* N.B. If we are in dev mode we have /dev/null and
* not a serial line...
*/
setpgrp();
if (tcsetpgrp(d, getpid()) < 0 && errno != ENOTTY)
mon_syslog(LOG_ERR, "dial: failed to set pgrp: %m");
} else {
setsid(); /* No controlling tty. */
umask (S_IRWXG|S_IRWXO);
chdir ("/"); /* no current directory. */
}
/* change the signal actions back to the defaults, then unblock them. */
default_sigacts();
unblock_signals();
#if 0
proxy_close();
#endif
/* make sure the stdin, stdout and stderr get directed to /dev/null */
if (p[0] >= 0) close(p[0]);
d2 = open("/dev/null", O_RDWR);
if (d >= 0) {
dup2((p[1] >= 0 ? p[1] : d2), 2);
close(d2);
if (d != 0) {
dup2(d, 0);
close(d);
} else {
fcntl(d, F_SETFD, 0);
}
dup2(0, 1);
} else {
if (d2 != 0) {
dup2(d2, 0);
close(d2);
}
dup2((p[1] >= 0 ? p[1] : 0), 1);
dup2((p[1] >= 0 ? p[1] : 0), 2);
}
/* set the current device (compat) */
if (current_dev)
setenv("MODEM", current_dev, 1);
/* set the current command FIFO (if any) */
if (fifoname)
setenv("FIFO", fifoname, 1);
if (current_dev)
setenv("DIALD_DEVICE", current_dev, 1);
if (link_name)
setenv("DIALD_LINK", link_name, 1);
execl("/bin/sh", "sh", "-c", buf, (char *)0);
mon_syslog(LOG_ERR, "could not exec /bin/sh: %m");
_exit(127);
/* NOTREACHED */
}
if (p[1] >= 0) close(p[1]);
if (mode & SHELL_WAIT) {
running_pid = pid;
if (p[0] >= 0 && (fd = fdopen(p[0], "r"))) {
char buf[1024];
while (fgets(buf, sizeof(buf)-1, fd)) {
buf[sizeof(buf)-1] = '\0';
mon_syslog(LOG_INFO, "%s: %s", name, buf);
}
fclose(fd);
}
unblock_signals();
while (running_pid)
pause();
return running_status;
}
if (p[0] >= 0) {
PIPE *ctrl_p;
if ((ctrl_p = malloc(sizeof(PIPE)))) {
pipe_init((char *)name, 0, p[0], ctrl_p, 0);
FD_SET(p[0], &ctrl_fds);
} else
close(p[0]);
}
unblock_signals();
return pid;
}
void
run_state_script(char *name, char *script, int background)
{
char buf[1024];
snprintf(buf, sizeof(buf)-1, "%s '%s' '%s' '%s' '%s'",
script,
snoop_dev,
netmask ? netmask : "255.255.255.255",
local_ip,
remote_ip);
buf[sizeof(buf)-1] = '\0';
if (debug&DEBUG_VERBOSE)
mon_syslog(LOG_INFO,"running %s script '%s'", name, buf);
if (background)
running_pid = run_shell(SHELL_NOWAIT, name, buf, -1);
else
run_shell(SHELL_WAIT, name, buf, -1);
}
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