+
−/* This a snippet I found in sourceforge. I just changed the identing
+
−   style to my own and deleted the main function. -- oku
+
−   The functions destroy_argv() and create_argv() were added by oku.
+
−*/
+
−
+
−#include <errno.h>
+
−#include <stdio.h>
+
−#include <stdlib.h>
+
−#include <unistd.h>
+
−#include <string.h>
+
−#include <sys/types.h>
+
−#include <sysexits.h>
+
−
+
−#include "peopen.h"
+
−#include "masqmail.h"
+
−
+
−static void
+
−destroy_argv(char **arr)
+
−{
+
−	char *p = arr[0];
+
−	int i = 0;
+
−
+
−	while (p) {
+
−		free(p);
+
−		p = arr[i++];
+
−	}
+
−	free(arr);
+
−}
+
−
+
−static char**
+
−create_argv(const char *cmd, int count)
+
−{
+
−	char buf[strlen(cmd) + 1];
+
−	char **arr, *q;
+
−	const char *p;
+
−	int i = 0;
+
−
+
−	arr = (char **) g_malloc(sizeof(char *) * count);
+
−
+
−	p = cmd;
+
−	while (*p && i < (count - 1)) {
+
−		while (*p && isspace(*p))
+
−			p++;
+
−		q = buf;
+
−		while (*p && !isspace(*p))
+
−			*q++ = *p++;
+
−		*q = '\0';
+
−		arr[i++] = strdup(buf);
+
−		while (*p && isspace(*p))
+
−			p++;
+
−	}
+
−	arr[i] = NULL;
+
−
+
−	return arr;
+
−}
+
−
+
−FILE*
+
−peidopen(const char *command, const char *type, char *const envp[], int *ret_pid, uid_t uid, gid_t gid)
+
−{
+
−	enum { Read, Write } mode;
+
−	int pipe_fd[2];
+
−	pid_t pid;
+
−
+
−	if (command == NULL || type == NULL) {
+
−		errno = EINVAL;
+
−		return NULL;
+
−	}
+
−
+
−	if (strcmp(type, "r")) {
+
−		if (strcmp(type, "w")) {
+
−			errno = EINVAL;
+
−			return NULL;
+
−		} else
+
−			mode = Write;
+
−	} else
+
−		mode = Read;
+
−
+
−	if (pipe(pipe_fd) == -1)
+
−		return NULL;
+
−
+
−	switch (pid = fork()) {
+
−	case 0:  /* child thread */
+
−
+
−		{
+
−			int i, max_fd = sysconf(_SC_OPEN_MAX);
+
−
+
−			if (max_fd <= 0)
+
−				max_fd = 64;
+
−			for (i = 0; i < max_fd; i++)
+
−				if ((i != pipe_fd[0]) && (i != pipe_fd[1]))
+
−					close(i);
+
−		}
+
−		if (close(pipe_fd[mode == Read ? 0 : 1]) != -1 &&
+
−			dup2(pipe_fd[mode == Read ? 1 : 0],
+
−				 mode == Read ? STDOUT_FILENO : STDIN_FILENO) != -1) {
+
−			//      char *argv [] = { "/bin/sh", "-c", (char*) command, NULL };
+
−			char **argv = create_argv(command, 10);
+
−			int ret;
+
−
+
−			if (uid != (uid_t) - 1) {
+
−				if ((ret = seteuid(0)) != 0) {
+
−					exit(EX_NOPERM);
+
−				}
+
−			}
+
−			if (gid != (gid_t) - 1) {
+
−				if ((ret = setgid(gid)) != 0) {
+
−					exit(EX_NOPERM);
+
−				}
+
−			}
+
−			if (uid != (uid_t) - 1) {
+
−				if ((ret = setuid(uid)) != 0) {
+
−					exit(EX_NOPERM);
+
−				}
+
−			}
+
−			execve(*argv, argv, envp);
+
−		}
+
−
+
−		_exit(errno);
+
−
+
−	default:  /* parent thread */
+
−		*ret_pid = pid;
+
−		close(pipe_fd[mode == Read ? 1 : 0]);
+
−		return fdopen(pipe_fd[mode == Read ? 0 : 1], type);
+
−
+
−	case -1:
+
−		close(pipe_fd[0]);
+
−		close(pipe_fd[1]);
+
−		return NULL;
+
−	}
+
−}
+
−
+
−FILE*
+
−peopen(const char *command, const char *type, char *const envp[], int *ret_pid)
+
−{
+
−	return peidopen(command, type, envp, ret_pid, -1, -1);
+
−}