/* nonblocking gethostbyname(), ip (IPADDR) + error (int, 0 = not error) is
written to pipe when found PID of the resolver child is returned */
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe)
{
RESOLVED_IP_REC rec;
const char *errorstr;
#ifndef WIN32
int pid;
#endif
g_return_val_if_fail(addr != NULL, FALSE);
#ifndef WIN32
pid = fork();
if (pid > 0) {
/* parent */
pidwait_add(pid);
return pid;
}
if (pid != 0) {
/* failed! */
g_warning("net_connect_thread(): fork() failed! "
"Using blocking resolving");
}
#endif
/* child */
memset(&rec, 0, sizeof(rec));
rec.error = net_gethostbyname(addr, &rec.ip4, &rec.ip6);
if (rec.error == 0) {
errorstr = NULL;
} else {
errorstr = net_gethosterror(rec.error);
rec.errlen = errorstr == NULL ? 0 : strlen(errorstr)+1;
}
g_io_channel_write_block(pipe, &rec, sizeof(rec));
if (rec.errlen != 0)
g_io_channel_write_block(pipe, (void *) errorstr, rec.errlen);
#ifndef WIN32
if (pid == 0)
_exit(99);
#endif
/* we used blocking lookup */
return 0;
}
static void sig_session_restore(CONFIG_REC *config)
{
CONFIG_NODE *node;
GSList *tmp;
char **pids, **pid;
/* restore servers */
node = config_node_traverse(config, "(servers", FALSE);
if (node != NULL) {
tmp = config_node_first(node->value);
for (; tmp != NULL; tmp = config_node_next(tmp))
session_restore_server(tmp->data);
}
/* restore pids (so we don't leave zombies) */
pids = g_strsplit(config_node_get_str(config->mainnode, "pids", ""), " ", -1);
for (pid = pids; *pid != NULL; pid++)
pidwait_add(atoi(*pid));
g_strfreev(pids);
}
/* nonblocking gethostbyname(), ip (IPADDR) + error (int, 0 = not error) is
written to pipe when found PID of the resolver child is returned */
int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
int reverse_lookup)
{
RESOLVED_IP_REC rec;
const char *errorstr;
int pid;
int len;
g_return_val_if_fail(addr != NULL, FALSE);
pid = fork();
if (pid > 0) {
/* parent */
pidwait_add(pid);
return pid;
}
if (pid != 0) {
/* failed! */
g_warning("net_connect_thread(): fork() failed! "
"Using blocking resolving");
}
/* child */
srand(time(NULL));
memset(&rec, 0, sizeof(rec));
rec.error = net_gethostbyname(addr, &rec.ip4, &rec.ip6);
if (rec.error == 0) {
errorstr = NULL;
if (reverse_lookup) {
/* reverse lookup the IP, ignore any error */
if (rec.ip4.family != 0)
net_gethostbyaddr(&rec.ip4, &rec.host4);
if (rec.ip6.family != 0)
net_gethostbyaddr(&rec.ip6, &rec.host6);
}
} else {
errorstr = net_gethosterror(rec.error);
rec.errlen = errorstr == NULL ? 0 : strlen(errorstr)+1;
}
g_io_channel_write_block(pipe, &rec, sizeof(rec));
if (rec.errlen != 0)
g_io_channel_write_block(pipe, (void *) errorstr, rec.errlen);
else {
if (rec.host4) {
len = strlen(rec.host4) + 1;
g_io_channel_write_block(pipe, (void *) &len,
sizeof(int));
g_io_channel_write_block(pipe, (void *) rec.host4,
len);
}
if (rec.host6) {
len = strlen(rec.host6) + 1;
g_io_channel_write_block(pipe, (void *) &len,
sizeof(int));
g_io_channel_write_block(pipe, (void *) rec.host6,
len);
}
}
if (pid == 0)
_exit(99);
/* we used blocking lookup */
return 0;
}
static void process_exec(PROCESS_REC *rec, const char *cmd)
{
const char *shell_args[4] = { "/bin/sh", "-c", NULL, NULL };
char **args;
int in[2], out[2];
int n;
if (pipe(in) == -1)
return;
if (pipe(out) == -1)
return;
shell_args[2] = cmd;
rec->pid = fork();
if (rec->pid == -1) {
/* error */
close(in[0]); close(in[1]);
close(out[0]); close(out[1]);
return;
}
if (rec->pid != 0) {
/* parent process */
GIOChannel *outio = g_io_channel_unix_new(in[1]);
rec->in = g_io_channel_unix_new(out[0]);
rec->out = net_sendbuffer_create(outio, 0);
close(out[1]);
close(in[0]);
pidwait_add(rec->pid);
return;
}
/* child process, try to clean up everything */
setsid();
setuid(getuid());
setgid(getgid());
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_DFL);
putenv("TERM=tty");
/* set stdin, stdout and stderr */
dup2(in[0], STDIN_FILENO);
dup2(out[1], STDOUT_FILENO);
dup2(out[1], STDERR_FILENO);
/* don't let child see our files */
for (n = 3; n < 256; n++)
close(n);
if (rec->shell) {
execvp(shell_args[0], (char **) shell_args);
fprintf(stderr, "Exec: /bin/sh: %s\n", g_strerror(errno));
} else {
args = g_strsplit(cmd, " ", -1);
execvp(args[0], args);
fprintf(stderr, "Exec: %s: %s\n", args[0], g_strerror(errno));
}
_exit(-1);
}
