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c1ebccb4 SS |
1 | /* |
2 | * Copyright (c) 2008 The DragonFly Project. All rights reserved. | |
3 | * | |
4 | * This code is derived from software contributed to The DragonFly Project | |
5 | * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * 3. Neither the name of The DragonFly Project nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific, prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #include <sys/types.h> | |
36 | #include <sys/wait.h> | |
37 | ||
fd1de51a SS |
38 | #include <err.h> |
39 | #include <errno.h> | |
40 | #include <fcntl.h> | |
c1ebccb4 | 41 | #include <limits.h> |
fd1de51a | 42 | #include <paths.h> |
6ec95705 | 43 | #include <signal.h> |
fd1de51a SS |
44 | #include <stdint.h> |
45 | #include <stdio.h> | |
46 | #include <syslog.h> | |
47 | #include <unistd.h> | |
48 | ||
49 | #include "dma.h" | |
50 | ||
c1ebccb4 SS |
51 | static int |
52 | create_mbox(const char *name) | |
53 | { | |
54 | struct sigaction sa, osa; | |
55 | pid_t child, waitchild; | |
56 | int status; | |
57 | int i; | |
58 | long maxfd; | |
59 | int e; | |
60 | int r = -1; | |
61 | ||
62 | /* | |
63 | * We need to enable SIGCHLD temporarily so that waitpid works. | |
64 | */ | |
65 | bzero(&sa, sizeof(sa)); | |
66 | sa.sa_handler = SIG_DFL; | |
67 | sigaction(SIGCHLD, &sa, &osa); | |
68 | ||
69 | do_timeout(100, 0); | |
70 | ||
71 | child = fork(); | |
72 | switch (child) { | |
73 | case 0: | |
74 | /* child */ | |
75 | maxfd = sysconf(_SC_OPEN_MAX); | |
76 | if (maxfd == -1) | |
77 | maxfd = 1024; /* what can we do... */ | |
78 | ||
79 | for (i = 3; i <= maxfd; ++i) | |
80 | close(i); | |
81 | ||
82 | execl(LIBEXEC_PATH "/dma-mbox-create", "dma-mbox-create", name, NULL); | |
83 | syslog(LOG_ERR, "cannot execute "LIBEXEC_PATH"/dma-mbox-create: %m"); | |
84 | exit(1); | |
85 | ||
86 | default: | |
87 | /* parent */ | |
88 | waitchild = waitpid(child, &status, 0); | |
89 | ||
90 | e = errno; | |
91 | ||
92 | do_timeout(0, 0); | |
93 | ||
94 | if (waitchild == -1 && e == EINTR) { | |
95 | syslog(LOG_ERR, "hung child while creating mbox `%s': %m", name); | |
96 | break; | |
97 | } | |
98 | ||
99 | if (waitchild == -1) { | |
100 | syslog(LOG_ERR, "child disappeared while creating mbox `%s': %m", name); | |
101 | break; | |
102 | } | |
103 | ||
104 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
105 | syslog(LOG_ERR, "error creating mbox `%s'", name); | |
106 | break; | |
107 | } | |
108 | ||
109 | /* success */ | |
110 | r = 0; | |
111 | break; | |
112 | ||
113 | case -1: | |
114 | /* error */ | |
115 | syslog(LOG_ERR, "error creating mbox"); | |
116 | break; | |
117 | } | |
118 | ||
119 | sigaction(SIGCHLD, &osa, NULL); | |
120 | ||
121 | return (r); | |
122 | } | |
123 | ||
fd1de51a | 124 | int |
249ee966 | 125 | deliver_local(struct qitem *it) |
fd1de51a SS |
126 | { |
127 | char fn[PATH_MAX+1]; | |
128 | char line[1000]; | |
5a96b98a SS |
129 | const char *sender; |
130 | const char *newline = "\n"; | |
fd1de51a | 131 | size_t linelen; |
c1ebccb4 | 132 | int tries = 0; |
fd1de51a SS |
133 | int mbox; |
134 | int error; | |
5a96b98a | 135 | int hadnl = 0; |
fd1de51a SS |
136 | off_t mboxlen; |
137 | time_t now = time(NULL); | |
138 | ||
139 | error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, it->addr); | |
140 | if (error < 0 || (size_t)error >= sizeof(fn)) { | |
4d5af2b0 | 141 | syslog(LOG_NOTICE, "local delivery deferred: %m"); |
fd1de51a SS |
142 | return (1); |
143 | } | |
144 | ||
c1ebccb4 | 145 | retry: |
f54b5114 SS |
146 | /* wait for a maximum of 100s to get the lock to the file */ |
147 | do_timeout(100, 0); | |
148 | ||
c1ebccb4 SS |
149 | /* don't use O_CREAT here, because we might be running as the wrong user. */ |
150 | mbox = open_locked(fn, O_WRONLY|O_APPEND); | |
fd1de51a | 151 | if (mbox < 0) { |
f54b5114 SS |
152 | int e = errno; |
153 | ||
154 | do_timeout(0, 0); | |
c1ebccb4 SS |
155 | |
156 | switch (e) { | |
157 | case EACCES: | |
158 | case ENOENT: | |
159 | /* | |
160 | * The file does not exist or we can't access it. | |
161 | * Call dma-mbox-create to create it and fix permissions. | |
162 | */ | |
163 | if (tries > 0 || create_mbox(it->addr) != 0) { | |
164 | syslog(LOG_ERR, "local delivery deferred: can not create `%s'", fn); | |
165 | return (1); | |
166 | } | |
167 | ++tries; | |
168 | goto retry; | |
169 | ||
170 | case EINTR: | |
f54b5114 | 171 | syslog(LOG_NOTICE, "local delivery deferred: can not lock `%s'", fn); |
c1ebccb4 SS |
172 | break; |
173 | ||
174 | default: | |
f54b5114 | 175 | syslog(LOG_NOTICE, "local delivery deferred: can not open `%s': %m", fn); |
c1ebccb4 SS |
176 | break; |
177 | } | |
fd1de51a SS |
178 | return (1); |
179 | } | |
f54b5114 SS |
180 | do_timeout(0, 0); |
181 | ||
5a96b98a SS |
182 | mboxlen = lseek(mbox, 0, SEEK_END); |
183 | ||
184 | /* New mails start with \nFrom ...., unless we're at the beginning of the mbox */ | |
185 | if (mboxlen == 0) | |
186 | newline = ""; | |
187 | ||
188 | /* If we're bouncing a message, claim it comes from MAILER-DAEMON */ | |
189 | sender = it->sender; | |
190 | if (strcmp(sender, "") == 0) | |
191 | sender = "MAILER-DAEMON"; | |
fd1de51a | 192 | |
6ddd63e1 | 193 | if (fseek(it->mailf, 0, SEEK_SET) != 0) { |
4d5af2b0 | 194 | syslog(LOG_NOTICE, "local delivery deferred: can not seek: %m"); |
f54b5114 | 195 | goto out; |
fd1de51a SS |
196 | } |
197 | ||
5a96b98a | 198 | error = snprintf(line, sizeof(line), "%sFrom %s\t%s", newline, sender, ctime(&now)); |
fd1de51a | 199 | if (error < 0 || (size_t)error >= sizeof(line)) { |
4d5af2b0 | 200 | syslog(LOG_NOTICE, "local delivery deferred: can not write header: %m"); |
f54b5114 | 201 | goto out; |
fd1de51a SS |
202 | } |
203 | if (write(mbox, line, error) != error) | |
204 | goto wrerror; | |
205 | ||
206 | while (!feof(it->mailf)) { | |
207 | if (fgets(line, sizeof(line), it->mailf) == NULL) | |
208 | break; | |
209 | linelen = strlen(line); | |
210 | if (linelen == 0 || line[linelen - 1] != '\n') { | |
4d5af2b0 | 211 | syslog(LOG_CRIT, "local delivery failed: corrupted queue file"); |
249ee966 | 212 | snprintf(errmsg, sizeof(errmsg), "corrupted queue file"); |
fd1de51a SS |
213 | error = -1; |
214 | goto chop; | |
215 | } | |
216 | ||
fedbe711 SS |
217 | /* |
218 | * mboxro processing: | |
219 | * - escape lines that start with "From " with a > sign. | |
220 | * - be reversable by escaping lines that contain an arbitrary | |
221 | * number of > signs, followed by "From ", i.e. />*From / in regexp. | |
222 | * - strict mbox processing only requires escaping after empty lines, | |
223 | * yet most MUAs seem to relax this requirement and will treat any | |
224 | * line starting with "From " as the beginning of a new mail. | |
225 | */ | |
226 | if ((!MBOX_STRICT || hadnl) && | |
227 | strncmp(&line[strspn(line, ">")], "From ", 5) == 0) { | |
fd1de51a SS |
228 | const char *gt = ">"; |
229 | ||
230 | if (write(mbox, gt, 1) != 1) | |
231 | goto wrerror; | |
5a96b98a SS |
232 | hadnl = 0; |
233 | } else if (strcmp(line, "\n") == 0) { | |
234 | hadnl = 1; | |
235 | } else { | |
236 | hadnl = 0; | |
fd1de51a SS |
237 | } |
238 | if ((size_t)write(mbox, line, linelen) != linelen) | |
239 | goto wrerror; | |
240 | } | |
fd1de51a SS |
241 | close(mbox); |
242 | return (0); | |
243 | ||
244 | wrerror: | |
4d5af2b0 | 245 | syslog(LOG_ERR, "local delivery failed: write error: %m"); |
fd1de51a SS |
246 | error = 1; |
247 | chop: | |
248 | if (ftruncate(mbox, mboxlen) != 0) | |
4d5af2b0 | 249 | syslog(LOG_WARNING, "error recovering mbox `%s': %m", fn); |
f54b5114 | 250 | out: |
fd1de51a SS |
251 | close(mbox); |
252 | return (error); | |
253 | } |