masqmail

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Changed lockdir to /var/lock/masqmail; Create lockdir and piddir on startup. Moved the lockdir out of the spool dir. (When /var/lock is a ramdisk we do well to have the lock files there.) Added the new configure option --with-lockdir to change that location. Nontheless, if we run_as_user, then lock files are always stored in the spool dir directly. Instead of installing the lockdir and piddir at installation time, we create them on startup time now if they are missing. This is necessary if lockdir or piddir are a tmpfs.
author markus schnalke <meillo@marmaro.de>
date Wed, 30 May 2012 09:38:38 +0200
parents b27f66555ba8
children
line source
1 /*
2 ** This a snippet I found in sourceforge. I just changed the identing
3 ** style to my own and deleted the main function. -- oku
4 ** The functions destroy_argv() and create_argv() were added by oku.
5 */
6
7 #include <errno.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <unistd.h>
11 #include <string.h>
12 #include <sys/types.h>
13 #include <sysexits.h>
14
15 #include "peopen.h"
16 #include "masqmail.h"
17
18 /*
19 ** static void
20 ** destroy_argv(char **arr)
21 ** {
22 ** char *p = arr[0];
23 ** int i = 0;
24 **
25 ** while (p) {
26 ** free(p);
27 ** p = arr[i++];
28 ** }
29 ** free(arr);
30 ** }
31 */
32
33 static char**
34 create_argv(const char *cmd, int count)
35 {
36 char buf[strlen(cmd) + 1];
37 char **arr, *q;
38 const char *p;
39 int i = 0;
40
41 arr = (char **) g_malloc(sizeof(char *) * count);
42
43 p = cmd;
44 while (*p && i < (count - 1)) {
45 while (*p && isspace(*p))
46 p++;
47 q = buf;
48 while (*p && !isspace(*p))
49 *q++ = *p++;
50 *q = '\0';
51 arr[i++] = strdup(buf);
52 while (*p && isspace(*p))
53 p++;
54 }
55 arr[i] = NULL;
56
57 return arr;
58 }
59
60 FILE*
61 peidopen(const char *command, const char *type, char *const envp[],
62 int *ret_pid, uid_t uid, gid_t gid)
63 {
64 enum { Read, Write } mode;
65 int pipe_fd[2];
66 pid_t pid;
67
68 if (command == NULL || type == NULL) {
69 errno = EINVAL;
70 return NULL;
71 }
72
73 if (strcmp(type, "r")) {
74 if (strcmp(type, "w")) {
75 errno = EINVAL;
76 return NULL;
77 } else
78 mode = Write;
79 } else
80 mode = Read;
81
82 if (pipe(pipe_fd) == -1)
83 return NULL;
84
85 switch (pid = fork()) {
86 case 0: /* child thread */
87
88 {
89 int i, max_fd = sysconf(_SC_OPEN_MAX);
90
91 if (max_fd <= 0)
92 max_fd = 64;
93 for (i = 0; i < max_fd; i++)
94 if ((i != pipe_fd[0]) && (i != pipe_fd[1]))
95 close(i);
96 }
97 if (close(pipe_fd[mode == Read ? 0 : 1]) != -1 &&
98 dup2(pipe_fd[mode == Read ? 1 : 0],
99 mode == Read ? STDOUT_FILENO : STDIN_FILENO) != -1) {
100 /* char *argv [] = { "/bin/sh", "-c", (char*) command, NULL }; */
101 char **argv = create_argv(command, 10);
102 int ret;
103
104 if (uid != (uid_t) - 1) {
105 if ((ret = seteuid(0)) != 0) {
106 exit(EX_NOPERM);
107 }
108 }
109 if (gid != (gid_t) - 1) {
110 if ((ret = setgid(gid)) != 0) {
111 exit(EX_NOPERM);
112 }
113 }
114 if (uid != (uid_t) - 1) {
115 if ((ret = setuid(uid)) != 0) {
116 exit(EX_NOPERM);
117 }
118 }
119 execve(*argv, argv, envp);
120 }
121
122 _exit(errno);
123
124 default: /* parent thread */
125 *ret_pid = pid;
126 close(pipe_fd[mode == Read ? 1 : 0]);
127 return fdopen(pipe_fd[mode == Read ? 0 : 1], type);
128
129 case -1:
130 close(pipe_fd[0]);
131 close(pipe_fd[1]);
132 return NULL;
133 }
134 }
135
136 FILE*
137 peopen(const char *command, const char *type, char *const envp[], int *ret_pid)
138 {
139 return peidopen(command, type, envp, ret_pid, -1, -1);
140 }