masqmail

annotate src/peopen.c @ 222:8cddc65765bd

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added support for STARTTLS wrappers added the route config option `instant_helo' which causes masqmail, as SMTP client, not to wait for the server's 220 greeting. Instead if says EHLO right at once. You'll need this for STARTTLS wrappers that usually eat the greeting line.
author meillo@marmaro.de
date Fri, 23 Jul 2010 10:57:53 +0200
parents 7cdd30429cc9
children b27f66555ba8
rev   line source
meillo@0 1 /* This a snippet I found in sourceforge. I just changed the identing
meillo@29 2 style to my own and deleted the main function. -- oku
meillo@29 3 The functions destroy_argv() and create_argv() were added by oku.
meillo@29 4 */
meillo@0 5
meillo@0 6 #include <errno.h>
meillo@0 7 #include <stdio.h>
meillo@0 8 #include <stdlib.h>
meillo@0 9 #include <unistd.h>
meillo@0 10 #include <string.h>
meillo@0 11 #include <sys/types.h>
meillo@15 12 #include <sysexits.h>
meillo@0 13
meillo@0 14 #include "peopen.h"
meillo@0 15 #include "masqmail.h"
meillo@0 16
meillo@10 17 static void
meillo@10 18 destroy_argv(char **arr)
meillo@0 19 {
meillo@10 20 char *p = arr[0];
meillo@10 21 int i = 0;
meillo@0 22
meillo@10 23 while (p) {
meillo@10 24 free(p);
meillo@10 25 p = arr[i++];
meillo@10 26 }
meillo@10 27 free(arr);
meillo@0 28 }
meillo@0 29
meillo@10 30 static char**
meillo@10 31 create_argv(const char *cmd, int count)
meillo@0 32 {
meillo@10 33 char buf[strlen(cmd) + 1];
meillo@10 34 char **arr, *q;
meillo@10 35 const char *p;
meillo@10 36 int i = 0;
meillo@0 37
meillo@27 38 arr = (char **) g_malloc(sizeof(char *) * count);
meillo@0 39
meillo@10 40 p = cmd;
meillo@10 41 while (*p && i < (count - 1)) {
meillo@10 42 while (*p && isspace(*p))
meillo@10 43 p++;
meillo@10 44 q = buf;
meillo@10 45 while (*p && !isspace(*p))
meillo@10 46 *q++ = *p++;
meillo@15 47 *q = '\0';
meillo@10 48 arr[i++] = strdup(buf);
meillo@10 49 while (*p && isspace(*p))
meillo@10 50 p++;
meillo@10 51 }
meillo@10 52 arr[i] = NULL;
meillo@10 53
meillo@10 54 return arr;
meillo@0 55 }
meillo@0 56
meillo@10 57 FILE*
meillo@10 58 peidopen(const char *command, const char *type, char *const envp[], int *ret_pid, uid_t uid, gid_t gid)
meillo@0 59 {
meillo@10 60 enum { Read, Write } mode;
meillo@10 61 int pipe_fd[2];
meillo@10 62 pid_t pid;
meillo@0 63
meillo@10 64 if (command == NULL || type == NULL) {
meillo@10 65 errno = EINVAL;
meillo@10 66 return NULL;
meillo@10 67 }
meillo@0 68
meillo@10 69 if (strcmp(type, "r")) {
meillo@10 70 if (strcmp(type, "w")) {
meillo@10 71 errno = EINVAL;
meillo@10 72 return NULL;
meillo@10 73 } else
meillo@10 74 mode = Write;
meillo@10 75 } else
meillo@10 76 mode = Read;
meillo@0 77
meillo@10 78 if (pipe(pipe_fd) == -1)
meillo@10 79 return NULL;
meillo@0 80
meillo@10 81 switch (pid = fork()) {
meillo@10 82 case 0: /* child thread */
meillo@0 83
meillo@10 84 {
meillo@10 85 int i, max_fd = sysconf(_SC_OPEN_MAX);
meillo@10 86
meillo@10 87 if (max_fd <= 0)
meillo@10 88 max_fd = 64;
meillo@10 89 for (i = 0; i < max_fd; i++)
meillo@10 90 if ((i != pipe_fd[0]) && (i != pipe_fd[1]))
meillo@10 91 close(i);
meillo@10 92 }
meillo@10 93 if (close(pipe_fd[mode == Read ? 0 : 1]) != -1 &&
meillo@10 94 dup2(pipe_fd[mode == Read ? 1 : 0],
meillo@10 95 mode == Read ? STDOUT_FILENO : STDIN_FILENO) != -1) {
meillo@207 96 /* char *argv [] = { "/bin/sh", "-c", (char*) command, NULL }; */
meillo@10 97 char **argv = create_argv(command, 10);
meillo@10 98 int ret;
meillo@10 99
meillo@10 100 if (uid != (uid_t) - 1) {
meillo@10 101 if ((ret = seteuid(0)) != 0) {
meillo@10 102 exit(EX_NOPERM);
meillo@10 103 }
meillo@10 104 }
meillo@10 105 if (gid != (gid_t) - 1) {
meillo@10 106 if ((ret = setgid(gid)) != 0) {
meillo@10 107 exit(EX_NOPERM);
meillo@10 108 }
meillo@10 109 }
meillo@10 110 if (uid != (uid_t) - 1) {
meillo@10 111 if ((ret = setuid(uid)) != 0) {
meillo@10 112 exit(EX_NOPERM);
meillo@10 113 }
meillo@10 114 }
meillo@10 115 execve(*argv, argv, envp);
meillo@10 116 }
meillo@10 117
meillo@10 118 _exit(errno);
meillo@10 119
meillo@10 120 default: /* parent thread */
meillo@10 121 *ret_pid = pid;
meillo@10 122 close(pipe_fd[mode == Read ? 1 : 0]);
meillo@10 123 return fdopen(pipe_fd[mode == Read ? 0 : 1], type);
meillo@10 124
meillo@10 125 case -1:
meillo@10 126 close(pipe_fd[0]);
meillo@10 127 close(pipe_fd[1]);
meillo@10 128 return NULL;
meillo@0 129 }
meillo@0 130 }
meillo@0 131
meillo@10 132 FILE*
meillo@10 133 peopen(const char *command, const char *type, char *const envp[], int *ret_pid)
meillo@0 134 {
meillo@10 135 return peidopen(command, type, envp, ret_pid, -1, -1);
meillo@0 136 }