-/* $Cambridge: exim/src/src/child.c,v 1.2 2004/10/15 13:21:21 ph10 Exp $ */
+/* $Cambridge: exim/src/src/child.c,v 1.9 2006/02/14 10:26:27 ph10 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* Copyright (c) University of Cambridge 1995 - 2006 */
/* See the file NOTICE for conditions of use and distribution. */
force_fd(int oldfd, int newfd)
{
if (oldfd == newfd) return;
-close(newfd);
-dup2(oldfd, newfd);
-close(oldfd);
+(void)close(newfd);
+(void)dup2(oldfd, newfd);
+(void)close(oldfd);
}
-
+#ifndef STAND_ALONE
/*************************************************
* Build argv list and optionally re-exec Exim *
*************************************************/
the pid of the new process, or -1 if things go wrong. If debug_fd is
non-negative, it is passed as stderr.
+This interface is now a just wrapper for the more complicated function
+child_open_exim2(), which has additional arguments. The wrapper must continue
+to exist, even if all calls from within Exim are changed, because it is
+documented for use from local_scan().
+
Argument: fdptr pointer to int for the stdin fd
Returns: pid of the created process or -1 if anything has gone wrong
*/
pid_t
child_open_exim(int *fdptr)
{
+return child_open_exim2(fdptr, US"<>", bounce_sender_authentication);
+}
+
+
+/* This is a more complicated function for creating a child Exim process, with
+more arguments.
+
+Arguments:
+ fdptr pointer to int for the stdin fd
+ sender for a sender address (data for -f)
+ sender_authentication authenticated sender address or NULL
+
+Returns: pid of the created process or -1 if anything has gone wrong
+*/
+
+pid_t
+child_open_exim2(int *fdptr, uschar *sender, uschar *sender_authentication)
+{
int pfd[2];
int save_errno;
pid_t pid;
if (pid == 0)
{
force_fd(pfd[pipe_read], 0);
- close(pfd[pipe_write]);
+ (void)close(pfd[pipe_write]);
if (debug_fd > 0) force_fd(debug_fd, 2);
- if (bounce_sender_authentication != NULL)
+ if (sender_authentication != NULL)
child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 8,
- US"-t", US"-oem", US"-oi", US"-f", US"<>", US"-oMas",
- bounce_sender_authentication, message_id_option);
+ US"-t", US"-oem", US"-oi", US"-f", sender, US"-oMas",
+ sender_authentication, message_id_option);
else
child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 6,
- US"-t", US"-oem", US"-oi", US"-f", US"<>", message_id_option);
+ US"-t", US"-oem", US"-oi", US"-f", sender, message_id_option);
/* Control does not return here. */
}
pipe. */
save_errno = errno;
-close(pfd[pipe_read]);
+(void)close(pfd[pipe_read]);
/* Fork succeeded */
/* Fork failed */
-close(pfd[pipe_write]);
+(void)close(pfd[pipe_write]);
errno = save_errno;
return (pid_t)(-1);
}
-
+#endif
process is placed
wd if not NULL, a path to be handed to chdir() in the new process
make_leader if TRUE, make the new process a process group leader
-
+
Returns: the pid of the created process or -1 if anything has gone wrong
*/
if (pipe(inpfd) != 0) return (pid_t)(-1);
if (pipe(outpfd) != 0)
{
- close(inpfd[pipe_read]);
- close(inpfd[pipe_write]);
+ (void)close(inpfd[pipe_read]);
+ (void)close(inpfd[pipe_write]);
return (pid_t)(-1);
}
oldsignal = signal(SIGCHLD, SIG_DFL);
pid = fork();
-/* The child process becomes a process group leader if requested, and then
-organizes the pipes. Any unexpected failure is signalled with EX_EXECFAILED;
-these are all "should never occur" failures, except perhaps for exec failing
-because the command doesn't exist. */
+/* Handle the child process. First, set the required environment. We must do
+this before messing with the pipes, in order to be able to write debugging
+output when things go wrong. */
if (pid == 0)
{
- if (make_leader && setpgid(0,0) < 0) goto CHILD_FAILED;
+ signal(SIGUSR1, SIG_IGN);
- close(inpfd[pipe_write]);
- force_fd(inpfd[pipe_read], 0);
+ if (newgid != NULL && setgid(*newgid) < 0)
+ {
+ DEBUG(D_any) debug_printf("failed to set gid=%ld in subprocess: %s\n",
+ (long int)(*newgid), strerror(errno));
+ goto CHILD_FAILED;
+ }
- close(outpfd[pipe_read]);
- force_fd(outpfd[pipe_write], 1);
+ if (newuid != NULL && setuid(*newuid) < 0)
+ {
+ DEBUG(D_any) debug_printf("failed to set uid=%ld in subprocess: %s\n",
+ (long int)(*newuid), strerror(errno));
+ goto CHILD_FAILED;
+ }
+
+ (void)umask(newumask);
+
+ if (wd != NULL && Uchdir(wd) < 0)
+ {
+ DEBUG(D_any) debug_printf("failed to chdir to %s: %s\n", wd,
+ strerror(errno));
+ goto CHILD_FAILED;
+ }
- close(2);
- dup2(1, 2);
+ /* Becomes a process group leader if requested, and then organize the pipes.
+ Any unexpected failure is signalled with EX_EXECFAILED; these are all "should
+ never occur" failures, except for exec failing because the command doesn't
+ exist. */
- /* Set the required environment. */
+ if (make_leader && setpgid(0,0) < 0)
+ {
+ DEBUG(D_any) debug_printf("failed to set group leader in subprocess: %s\n",
+ strerror(errno));
+ goto CHILD_FAILED;
+ }
- signal(SIGUSR1, SIG_IGN);
- if (newgid != NULL && setgid(*newgid) < 0) goto CHILD_FAILED;
- if (newuid != NULL && setuid(*newuid) < 0) goto CHILD_FAILED;
- (void)umask(newumask);
+ (void)close(inpfd[pipe_write]);
+ force_fd(inpfd[pipe_read], 0);
- /* Set the working directory if required */
+ (void)close(outpfd[pipe_read]);
+ force_fd(outpfd[pipe_write], 1);
- if (wd != NULL && Uchdir(wd) < 0) goto CHILD_FAILED;
+ (void)close(2);
+ (void)dup2(1, 2);
/* Now do the exec */
/* Failed to execv. Signal this failure using EX_EXECFAILED. We are
losing the actual errno we got back, because there is no way to return
- this. */
+ this information. */
CHILD_FAILED:
_exit(EX_EXECFAILED); /* Note: must be _exit(), NOT exit() */
stdin pipe, and the writing end of the stdout pipe. */
save_errno = errno;
-close(inpfd[pipe_read]);
-close(outpfd[pipe_write]);
+(void)close(inpfd[pipe_read]);
+(void)close(outpfd[pipe_write]);
/* Fork succeeded; return the input/output pipes and the pid */
/* Fork failed; reset fork errno before returning */
-close(inpfd[pipe_write]);
-close(outpfd[pipe_read]);
+(void)close(inpfd[pipe_write]);
+(void)close(outpfd[pipe_read]);
errno = save_errno;
return (pid_t)(-1);
}
projects / exim.git / blobdiff