masqmail

view src/online.c @ 281:ea5f86e0a81c

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modes are now enforced exclusive Other MTAs (exim, postfix) are more relaxing, but as combinations of exclusive modes are senseless we behave more obvious if we fail early. This makes understanding the behavior easier too.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 14:04:56 -0300
parents fc1c6425c024
children f10a56dc7481
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2008, 2010 markus schnalke <meillo@marmaro.de>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #include <sys/stat.h>
21 #include <sys/wait.h>
22
23 #include "masqmail.h"
24 #include "peopen.h"
25
26 gchar *connection_name;
27
28 void
29 set_online_name(gchar * name)
30 {
31 connection_name = g_strdup(name);
32 }
33
34 static gchar*
35 detect_online_file(const gchar* file)
36 {
37 struct stat st;
38 int err;
39 FILE *fptr;
40 char buf[256];
41
42 err = stat(conf.online_file, &st);
43
44 if (err) {
45 if (errno==ENOENT) {
46 logwrite(LOG_NOTICE, "not online.\n");
47 return NULL;
48 }
49 logwrite(LOG_ALERT, "stat of %s failed: %s\n", conf.online_file, strerror(errno));
50 return NULL;
51 }
52
53 fptr = fopen(conf.online_file, "r");
54 if (!fptr) {
55 logwrite(LOG_ALERT, "opening of %s failed: %s\n", conf.online_file, strerror(errno));
56 return NULL;
57 }
58 if (fgets(buf, 256, fptr) == NULL) {
59 logwrite(LOG_ALERT, "empty online file %s\n", conf.online_file);
60 fclose(fptr);
61 return NULL;
62 }
63 g_strstrip(buf); /* strip whitespace */
64 fclose(fptr);
65 if (strlen(buf) == 0) {
66 logwrite(LOG_ALERT, "only whitespace connection name in %s\n", conf.online_file);
67 return NULL;
68 }
69 return g_strdup(buf);
70 }
71
72 static gchar*
73 detect_online_pipe(const gchar * pipe)
74 {
75 pid_t pid;
76 void (*old_signal) (int);
77 int status;
78 FILE *in;
79 gchar *name = NULL;
80
81 old_signal = signal(SIGCHLD, SIG_DFL);
82
83 in = peopen(pipe, "r", environ, &pid);
84 if (in == NULL) {
85 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", pipe, strerror(errno));
86 signal(SIGCHLD, old_signal);
87 return NULL;
88 }
89
90 gchar output[256];
91 if (fgets(output, 255, in)) {
92 g_strchomp(g_strchug(output));
93 if (strlen(output) == 0) {
94 logwrite(LOG_ALERT, "only whitespace connection name\n");
95 name = NULL;
96 } else {
97 name = g_strdup(output);
98 }
99 } else {
100 logwrite(LOG_ALERT, "nothing read from pipe %s\n", pipe);
101 name = NULL;
102 }
103 fclose(in);
104 waitpid(pid, &status, 0);
105 if (WEXITSTATUS(status) != 0) {
106 g_free(name);
107 name = NULL;
108 }
109
110 signal(SIGCHLD, old_signal);
111
112 return name;
113 }
114
115 gchar*
116 detect_online()
117 {
118 if (!conf.online_detect) {
119 return NULL;
120 }
121
122 if (strcmp(conf.online_detect, "file") == 0) {
123 DEBUG(3) debugf("online detection method 'file'\n");
124 if (!conf.online_file) {
125 logwrite(LOG_ALERT, "online detection mode is 'file', but online_file is undefined\n");
126 return NULL;
127 }
128 return detect_online_file(conf.online_file);
129
130 } else if (strcmp(conf.online_detect, "pipe") == 0) {
131 DEBUG(3) debugf("connection method 'pipe'\n");
132 if (!conf.online_pipe) {
133 logwrite(LOG_ALERT, "online detection mode is 'pipe', but online_pipe is undefined\n");
134 return NULL;
135 }
136 return detect_online_pipe(conf.online_pipe);
137
138 } else if (strcmp(conf.online_detect, "argument") == 0) {
139 DEBUG(3) debugf("online route literally defined\n");
140 /* use the name set with set_online_name() */
141 return connection_name;
142
143 }
144
145 DEBUG(3) debugf("unknown online detection method `%s'\n", conf.online_detect);
146 return NULL;
147 }