static pid_t spawn_event_handler_child(const char *dump_dir_name, const char *event_name, int *fdp)
{
char *args[9];
args[0] = (char *) LIBEXEC_DIR"/abrt-handle-event";
/* Do not forward ASK_* messages to parent*/
args[1] = (char *) "-i";
args[2] = (char *) "--nice";
args[3] = (char *) "10";
args[4] = (char *) "-e";
args[5] = (char *) event_name;
args[6] = (char *) "--";
args[7] = (char *) dump_dir_name;
args[8] = NULL;
int pipeout[2];
int flags = EXECFLG_INPUT_NUL | EXECFLG_OUTPUT | EXECFLG_QUIET | EXECFLG_ERR2OUT;
VERB1 flags &= ~EXECFLG_QUIET;
char *env_vec[3];
/* Intercept ASK_* messages in Client API -> don't wait for user response */
env_vec[0] = xstrdup("REPORT_CLIENT_NONINTERACTIVE=1");
env_vec[1] = xasprintf("%s=%d", ABRT_SERVER_EVENT_ENV, getpid());
env_vec[2] = NULL;
pid_t child = fork_execv_on_steroids(flags, args, pipeout,
env_vec, /*dir:*/ NULL,
/*uid(unused):*/ 0);
if (fdp)
*fdp = pipeout[0];
return child;
}
char *run_in_shell_and_save_output(int flags,
const char *cmd,
const char *dir,
size_t *size_p)
{
flags |= EXECFLG_OUTPUT;
flags &= ~EXECFLG_INPUT;
const char *argv[] = { "/bin/sh", "-c", cmd, NULL };
int pipeout[2];
pid_t child = fork_execv_on_steroids(flags, (char **)argv, pipeout,
/*env_vec:*/ NULL, dir, /*uid (unused):*/ 0);
size_t pos = 0;
char *result = NULL;
while (1) {
result = (char*) xrealloc(result, pos + 4*1024 + 1);
size_t sz = safe_read(pipeout[0], result + pos, 4*1024);
if (sz <= 0) {
break;
}
pos += sz;
}
result[pos] = '\0';
if (size_p)
*size_p = pos;
close(pipeout[0]);
waitpid(child, NULL, 0);
return result;
}
int spawn_next_command(struct run_event_state *state,
const char *dump_dir_name,
const char *event,
unsigned execflags
) {
char *cmd = pop_next_command(&state->rule_list,
NULL, /* don't return event_name */
NULL, /* NULL dd: we match by... */
dump_dir_name, /* ...dirname */
event, strlen(event)+1 /* for this event name exactly (not prefix) */
);
if (!cmd)
return -1;
/* We count it even if fork fails. The counter isn't meant
* to count *successful* forks, it is meant to let caller know
* whether the event we run has *any* handlers configured, or not.
*/
state->children_count++;
log_notice("Executing '%s'", cmd);
/* Export some useful environment variables for children */
char *env_vec[4];
/* Just exporting dump_dir_name isn't always ok: it can be "."
* and some children want to cd to other directory but still
* be able to find problem directory by using $DUMP_DIR...
*/
char *full_name = realpath(dump_dir_name, NULL);
env_vec[0] = xasprintf("DUMP_DIR=%s", (full_name ? full_name : dump_dir_name));
free(full_name);
env_vec[1] = xasprintf("EVENT=%s", event);
env_vec[2] = xasprintf("REPORT_CLIENT_SLAVE=1");
env_vec[3] = NULL;
char *argv[4];
argv[0] = (char*)"/bin/sh"; // TODO: honor $SHELL?
argv[1] = (char*)"-c";
argv[2] = cmd;
argv[3] = NULL;
int pipefds[2];
state->command_pid = fork_execv_on_steroids(
EXECFLG_INPUT | EXECFLG_OUTPUT | EXECFLG_ERR2OUT | execflags,
argv,
pipefds,
/* env_vec: */ env_vec,
/* dir: */ dump_dir_name,
/* uid(unused): */ 0
);
state->command_out_fd = pipefds[0];
state->command_in_fd = pipefds[1];
free(env_vec[0]);
free(env_vec[1]);
free(env_vec[2]);
free(cmd);
return 0;
}
static void exec_and_feed_input(const char* text, char **args)
{
int pipein[2];
pid_t child = fork_execv_on_steroids(
EXECFLG_INPUT | EXECFLG_QUIET,
args,
pipein,
/*env_vec:*/ NULL,
/*dir:*/ NULL,
/*uid (ignored):*/ 0
);
full_write_str(pipein[1], text);
close(pipein[1]);
int status;
waitpid(child, &status, 0); /* wait for command completion */
if (status != 0)
error_msg_and_die("Error running '%s'", args[0]);
}
/**
*
* @param[out] status See `man 2 wait` for status information.
* @return Malloc'ed string
*/
static char* exec_vp(char **args, int redirect_stderr, int exec_timeout_sec, int *status)
{
/* Nuke everything which may make setlocale() switch to non-POSIX locale:
* we need to avoid having gdb output in some obscure language.
*/
static const char *const env_vec[] = {
"LANG",
"LC_ALL",
"LC_COLLATE",
"LC_CTYPE",
"LC_MESSAGES",
"LC_MONETARY",
"LC_NUMERIC",
"LC_TIME",
/* Workaround for
* http://sourceware.org/bugzilla/show_bug.cgi?id=9622
* (gdb emitting ESC sequences even with -batch)
*/
"TERM",
NULL
};
int flags = EXECFLG_INPUT_NUL | EXECFLG_OUTPUT | EXECFLG_SETSID | EXECFLG_QUIET;
if (redirect_stderr)
flags |= EXECFLG_ERR2OUT;
VERB1 flags &= ~EXECFLG_QUIET;
int pipeout[2];
pid_t child = fork_execv_on_steroids(flags, args, pipeout, (char**)env_vec, /*dir:*/ NULL, /*uid(unused):*/ 0);
/* We use this function to run gdb and unstrip. Bugs in gdb or corrupted
* coredumps were observed to cause gdb to enter infinite loop.
* Therefore we have a (largish) timeout, after which we kill the child.
*/
ndelay_on(pipeout[0]);
int t = time(NULL); /* int is enough, no need to use time_t */
int endtime = t + exec_timeout_sec;
struct strbuf *buf_out = strbuf_new();
while (1)
{
int timeout = endtime - t;
if (timeout < 0)
{
kill(child, SIGKILL);
strbuf_append_strf(buf_out, "\n"
"Timeout exceeded: %u seconds, killing %s.\n"
"Looks like gdb hung while generating backtrace.\n"
"This may be a bug in gdb. Consider submitting a bug report to gdb developers.\n"
"Please attach coredump from this crash to the bug report if you do.\n",
exec_timeout_sec, args[0]
);
break;
}
/* We don't check poll result - checking read result is enough */
struct pollfd pfd;
pfd.fd = pipeout[0];
pfd.events = POLLIN;
poll(&pfd, 1, timeout * 1000);
char buff[1024];
int r = read(pipeout[0], buff, sizeof(buff) - 1);
if (r <= 0)
{
/* I did see EAGAIN happening here */
if (r < 0 && errno == EAGAIN)
goto next;
break;
}
buff[r] = '\0';
strbuf_append_str(buf_out, buff);
next:
t = time(NULL);
}
close(pipeout[0]);
/* Prevent having zombie child process, and maybe collect status
* (note that status == NULL is ok too) */
safe_waitpid(child, status, 0);
return strbuf_free_nobuf(buf_out);
}
char *run_unstrip_n(const char *dump_dir_name, unsigned timeout_sec)
{
int flags = EXECFLG_INPUT_NUL | EXECFLG_OUTPUT | EXECFLG_SETSID | EXECFLG_QUIET;
VERB1 flags &= ~EXECFLG_QUIET;
int pipeout[2];
char* args[4];
args[0] = (char*)"eu-unstrip";
args[1] = xasprintf("--core=%s/"FILENAME_COREDUMP, dump_dir_name);
args[2] = (char*)"-n";
args[3] = NULL;
pid_t child = fork_execv_on_steroids(flags, args, pipeout, /*env_vec:*/ NULL, /*dir:*/ NULL, /*uid(unused):*/ 0);
free(args[1]);
/* Bugs in unstrip or corrupted coredumps can cause it to enter infinite loop.
* Therefore we have a (largish) timeout, after which we kill the child.
*/
ndelay_on(pipeout[0]);
int t = time(NULL); /* int is enough, no need to use time_t */
int endtime = t + timeout_sec;
struct strbuf *buf_out = strbuf_new();
while (1)
{
int timeout = endtime - t;
if (timeout < 0)
{
kill(child, SIGKILL);
strbuf_free(buf_out);
buf_out = NULL;
break;
}
/* We don't check poll result - checking read result is enough */
struct pollfd pfd;
pfd.fd = pipeout[0];
pfd.events = POLLIN;
poll(&pfd, 1, timeout * 1000);
char buff[1024];
int r = read(pipeout[0], buff, sizeof(buff) - 1);
if (r <= 0)
{
/* I did see EAGAIN happening here */
if (r < 0 && errno == EAGAIN)
goto next;
break;
}
buff[r] = '\0';
strbuf_append_str(buf_out, buff);
next:
t = time(NULL);
}
close(pipeout[0]);
/* Prevent having zombie child process */
int status;
safe_waitpid(child, &status, 0);
if (status != 0 || buf_out == NULL)
{
/* unstrip didnt exit with exit code 0, or we timed out */
strbuf_free(buf_out);
return NULL;
}
return strbuf_free_nobuf(buf_out);
}
static char *run_unstrip_n(const char *dump_dir_name, unsigned timeout_sec)
{
struct dump_dir *dd = dd_opendir(dump_dir_name, /*flags:*/ 0);
if (!dd)
return NULL;
char *uid_str = dd_load_text_ext(dd, FILENAME_UID, DD_FAIL_QUIETLY_ENOENT | DD_LOAD_TEXT_RETURN_NULL_ON_FAILURE);
dd_close(dd);
uid_t uid = -1L;
if (uid_str)
{
uid = xatoi_positive(uid_str);
free(uid_str);
if (uid == geteuid())
{
uid = -1L; /* no need to setuid/gid if we are already under right uid */
}
}
int flags = EXECFLG_INPUT_NUL | EXECFLG_OUTPUT | EXECFLG_SETSID | EXECFLG_QUIET;
if (uid != (uid_t)-1L)
flags |= EXECFLG_SETGUID;
VERB1 flags &= ~EXECFLG_QUIET;
int pipeout[2];
char* args[4];
args[0] = (char*)"eu-unstrip";
args[1] = xasprintf("--core=%s/"FILENAME_COREDUMP, dump_dir_name);
args[2] = (char*)"-n";
args[3] = NULL;
pid_t child = fork_execv_on_steroids(flags, args, pipeout, /*env_vec:*/ NULL, /*dir:*/ NULL, uid);
free(args[1]);
/* Bugs in unstrip or corrupted coredumps can cause it to enter infinite loop.
* Therefore we have a (largish) timeout, after which we kill the child.
*/
int t = time(NULL); /* int is enough, no need to use time_t */
int endtime = t + timeout_sec;
struct strbuf *buf_out = strbuf_new();
while (1)
{
int timeout = endtime - t;
if (timeout < 0)
{
kill(child, SIGKILL);
strbuf_append_strf(buf_out, "\nTimeout exceeded: %u seconds, killing %s\n", timeout_sec, args[0]);
break;
}
/* We don't check poll result - checking read result is enough */
struct pollfd pfd;
pfd.fd = pipeout[0];
pfd.events = POLLIN;
poll(&pfd, 1, timeout * 1000);
char buff[1024];
int r = read(pipeout[0], buff, sizeof(buff) - 1);
if (r <= 0)
break;
buff[r] = '\0';
strbuf_append_str(buf_out, buff);
t = time(NULL);
}
close(pipeout[0]);
/* Prevent having zombie child process */
int status;
waitpid(child, &status, 0);
if (status != 0)
{
/* unstrip didnt exit with exit code 0 */
strbuf_free(buf_out);
return NULL;
}
return strbuf_free_nobuf(buf_out);
}
