Commit | Line | Data |
---|---|---|
bb6ae3fb | 1 | /* |
2 | * This file is part of DisOrder | |
5aff007d | 3 | * Copyright (C) 2007-2008 Richard Kettlewell |
bb6ae3fb | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
bb6ae3fb | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
bb6ae3fb | 8 | * (at your option) any later version. |
e7eb3a27 RK |
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 | * | |
bb6ae3fb | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
bb6ae3fb | 17 | */ |
132a5a4a RK |
18 | /** @file lib/sendmail.c |
19 | * @brief Sending email | |
20 | * | |
21 | * Can send email either via a local MTA or by connecting to an SMTP TCP port. | |
22 | * The former is preferred as there is a strong implication that the local MTA | |
23 | * will queue for you than some random TCP SMTP server you found. | |
24 | */ | |
05b75f8d | 25 | #include "common.h" |
bb6ae3fb | 26 | |
bb6ae3fb | 27 | #include <errno.h> |
28 | #include <stdarg.h> | |
29 | #include <sys/socket.h> | |
30 | #include <netdb.h> | |
31 | #include <unistd.h> | |
32 | #include <gcrypt.h> | |
ab29cd16 | 33 | #include <time.h> |
edbd470f | 34 | #include <netinet/in.h> |
bb6ae3fb | 35 | |
36 | #include "syscalls.h" | |
37 | #include "log.h" | |
38 | #include "configuration.h" | |
39 | #include "inputline.h" | |
40 | #include "addr.h" | |
41 | #include "hostname.h" | |
42 | #include "sendmail.h" | |
43 | #include "base64.h" | |
2eee4b0c | 44 | #include "wstat.h" |
bb6ae3fb | 45 | |
46 | /** @brief Get a server response | |
47 | * @param tag Server name | |
48 | * @param in Input stream | |
49 | * @return Response code 0-999 or -1 on error | |
50 | */ | |
51 | static int getresponse(const char *tag, FILE *in) { | |
52 | char *line; | |
53 | ||
54 | while(!inputline(tag, in, &line, CRLF)) { | |
55 | if(line[0] >= '0' && line[0] <= '9' | |
56 | && line[1] >= '0' && line[1] <= '9' | |
57 | && line[2] >= '0' && line[2] <= '9') { | |
58 | const int rc = 10 * (10 * line[0] + line[1]) + line[2] - 111 * '0'; | |
59 | if(rc >= 400 && rc <= 599) | |
60 | error(0, "%s: %s", tag, line); | |
61 | if(line[3] != '-') { | |
62 | return rc; | |
63 | } | |
64 | /* else go round for further response lines */ | |
65 | } else { | |
66 | error(0, "%s: malformed response: %s", tag, line); | |
67 | return -1; | |
68 | } | |
69 | } | |
70 | if(ferror(in)) | |
71 | error(errno, "%s: read error", tag); | |
72 | else | |
73 | error(0, "%s: server closed connection", tag); | |
74 | return -1; | |
75 | } | |
76 | ||
77 | /** @brief Send a command to the server | |
78 | * @param tag Server name | |
79 | * @param out stream to send commands to | |
80 | * @param fmt Format string | |
81 | * @return 0 on success, non-0 on error | |
82 | */ | |
83 | static int sendcommand(const char *tag, FILE *out, const char *fmt, ...) { | |
84 | va_list ap; | |
85 | int rc; | |
86 | ||
87 | va_start(ap, fmt); | |
88 | rc = vfprintf(out, fmt, ap); | |
89 | va_end(ap); | |
90 | if(rc >= 0) | |
91 | rc = fputs("\r\n", out); | |
92 | if(rc >= 0) | |
93 | rc = fflush(out); | |
94 | if(rc >= 0) | |
95 | return 0; | |
96 | error(errno, "%s: write error", tag); | |
97 | return -1; | |
98 | } | |
99 | ||
100 | /** @brief Send a mail message | |
101 | * @param tag Server name | |
102 | * @param in Stream to read responses from | |
103 | * @param out Stream to send commands to | |
104 | * @param sender Sender address (can be "") | |
105 | * @param pubsender Visible sender address (must not be "") | |
106 | * @param recipient Recipient address | |
107 | * @param subject Subject string | |
108 | * @param encoding Body encoding | |
0590cedc | 109 | * @param content_type Content-type of body |
bb6ae3fb | 110 | * @param body Text of body (encoded, but \n for newline) |
111 | * @return 0 on success, non-0 on error | |
112 | */ | |
113 | static int sendmailfp(const char *tag, FILE *in, FILE *out, | |
114 | const char *sender, | |
115 | const char *pubsender, | |
116 | const char *recipient, | |
117 | const char *subject, | |
118 | const char *encoding, | |
119 | const char *content_type, | |
120 | const char *body) { | |
121 | int rc, sol = 1; | |
122 | const char *ptr; | |
123 | uint8_t idbuf[20]; | |
124 | char *id; | |
ab29cd16 | 125 | struct tm ut; |
126 | time_t now; | |
127 | char date[128]; | |
bb6ae3fb | 128 | |
ab29cd16 | 129 | time(&now); |
130 | gmtime_r(&now, &ut); | |
131 | strftime(date, sizeof date, "%a, %d %b %Y %H:%M:%S +0000", &ut); | |
bb6ae3fb | 132 | gcry_create_nonce(idbuf, sizeof idbuf); |
133 | id = mime_to_base64(idbuf, sizeof idbuf); | |
134 | if((rc = getresponse(tag, in)) / 100 != 2) | |
135 | return -1; | |
136 | if(sendcommand(tag, out, "HELO %s", local_hostname())) | |
137 | return -1; | |
138 | if((rc = getresponse(tag, in)) / 100 != 2) | |
139 | return -1; | |
140 | if(sendcommand(tag, out, "MAIL FROM:<%s>", sender)) | |
141 | return -1; | |
142 | if((rc = getresponse(tag, in)) / 100 != 2) | |
143 | return -1; | |
144 | if(sendcommand(tag, out, "RCPT TO:<%s>", recipient)) | |
145 | return -1; | |
146 | if((rc = getresponse(tag, in)) / 100 != 2) | |
147 | return -1; | |
148 | if(sendcommand(tag, out, "DATA", sender)) | |
149 | return -1; | |
150 | if((rc = getresponse(tag, in)) / 100 != 3) | |
151 | return -1; | |
152 | if(fprintf(out, "From: %s\r\n", pubsender) < 0 | |
153 | || fprintf(out, "To: %s\r\n", recipient) < 0 | |
154 | || fprintf(out, "Subject: %s\r\n", subject) < 0 | |
155 | || fprintf(out, "Message-ID: <%s@%s>\r\n", id, local_hostname()) < 0 | |
156 | || fprintf(out, "MIME-Version: 1.0\r\n") < 0 | |
157 | || fprintf(out, "Content-Type: %s\r\n", content_type) < 0 | |
158 | || fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0 | |
ab29cd16 | 159 | || fprintf(out, "Date: %s\r\n", date) < 0 |
bb6ae3fb | 160 | || fprintf(out, "\r\n") < 0) { |
161 | write_error: | |
162 | error(errno, "%s: write error", tag); | |
163 | return -1; | |
164 | } | |
165 | for(ptr = body; *ptr; ++ptr) { | |
166 | if(sol && *ptr == '.') | |
167 | if(fputc('.', out) < 0) | |
168 | goto write_error; | |
169 | if(*ptr == '\n') { | |
170 | if(fputc('\r', out) < 0) | |
171 | goto write_error; | |
172 | sol = 1; | |
173 | } else | |
174 | sol = 0; | |
175 | if(fputc(*ptr, out) < 0) | |
176 | goto write_error; | |
177 | } | |
178 | if(!sol) | |
179 | if(fputs("\r\n", out) < 0) | |
180 | goto write_error; | |
181 | if(fprintf(out, ".\r\n") < 0 | |
182 | || fflush(out) < 0) | |
183 | goto write_error; | |
184 | if((rc = getresponse(tag, in)) / 100 != 2) | |
185 | return -1; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /** @brief Send a mail message | |
190 | * @param sender Sender address (can be "") | |
191 | * @param pubsender Visible sender address (must not be "") | |
192 | * @param recipient Recipient address | |
193 | * @param subject Subject string | |
194 | * @param encoding Body encoding | |
195 | * @param content_type Content-type of body | |
196 | * @param body Text of body (encoded, but \n for newline) | |
197 | * @return 0 on success, non-0 on error | |
198 | * | |
199 | * See mime_encode_text() for encoding of text bodies. | |
200 | */ | |
201 | int sendmail(const char *sender, | |
202 | const char *pubsender, | |
203 | const char *recipient, | |
204 | const char *subject, | |
205 | const char *encoding, | |
206 | const char *content_type, | |
207 | const char *body) { | |
208 | struct stringlist a; | |
209 | char *s[2]; | |
210 | struct addrinfo *ai; | |
211 | char *tag; | |
212 | int fdin, fdout, rc; | |
213 | FILE *in, *out; | |
2eee4b0c | 214 | pid_t pid = -1; |
bb6ae3fb | 215 | |
216 | static const struct addrinfo pref = { | |
66613034 RK |
217 | .ai_flags = 0, |
218 | .ai_family = PF_INET, | |
219 | .ai_socktype = SOCK_STREAM, | |
220 | .ai_protocol = IPPROTO_TCP, | |
bb6ae3fb | 221 | }; |
222 | ||
223 | /* Find the SMTP server */ | |
2eee4b0c RK |
224 | if(config->sendmail && config->sendmail[0]) { |
225 | int inpipe[2], outpipe[2]; | |
226 | ||
227 | /* If it's a path name, use -bs mode. Exim, Postfix and Sendmail all claim | |
228 | * to support this. */ | |
229 | xpipe(inpipe); /* sendmail's stdin */ | |
230 | xpipe(outpipe); /* sendmail's stdout */ | |
231 | if(!(pid = xfork())) { | |
232 | exitfn = _exit; | |
233 | signal(SIGPIPE, SIG_DFL); | |
234 | xdup2(inpipe[0], 0); | |
235 | xclose(inpipe[1]); | |
236 | xclose(outpipe[0]); | |
237 | xdup2(outpipe[1], 1); | |
238 | execlp(config->sendmail, | |
239 | config->sendmail, "-bs", (char *)0); | |
240 | fatal(errno, "executing %s", config->sendmail); | |
241 | } | |
242 | xclose(inpipe[0]); | |
243 | xclose(outpipe[1]); | |
244 | fdin = outpipe[0]; /* read from sendmail's stdout */ | |
245 | fdout = inpipe[1]; /* write to sendmail's stdin */ | |
246 | tag = config->sendmail; | |
247 | } else { | |
248 | a.n = 2; | |
249 | a.s = s; | |
250 | s[0] = config->smtp_server; | |
251 | s[1] = (char *)"smtp"; | |
252 | if(!(ai = get_address(&a, &pref, &tag))) | |
253 | return -1; | |
254 | fdin = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
255 | if(connect(fdin, ai->ai_addr, ai->ai_addrlen) < 0) { | |
256 | error(errno, "error connecting to %s", tag); | |
257 | xclose(fdin); | |
258 | return -1; | |
259 | } | |
260 | if((fdout = dup(fdin)) < 0) | |
261 | fatal(errno, "error calling dup2"); | |
bb6ae3fb | 262 | } |
bb6ae3fb | 263 | if(!(in = fdopen(fdin, "rb"))) |
264 | fatal(errno, "error calling fdopen"); | |
265 | if(!(out = fdopen(fdout, "wb"))) | |
266 | fatal(errno, "error calling fdopen"); | |
267 | rc = sendmailfp(tag, in, out, sender, pubsender, recipient, subject, | |
268 | encoding, content_type, body); | |
269 | fclose(in); | |
270 | fclose(out); | |
2eee4b0c RK |
271 | if(pid != -1) { |
272 | int w; | |
273 | ||
274 | while(waitpid(pid, &w, 0) < 0 && errno == EINTR) | |
275 | ; | |
276 | if(w < 0) | |
277 | fatal(errno, "error calling waitpid"); | |
c4f9292b RK |
278 | if(w) |
279 | info("warning: %s -bs: %s", config->sendmail, wstat(w)); | |
280 | /* Not fatal - we determine success/failure from the SMTP conversation. | |
281 | * Some MTAs exit nonzero if you don't QUIT, which is just stupidly | |
282 | * picky. */ | |
2eee4b0c | 283 | } |
bb6ae3fb | 284 | return rc; |
285 | } | |
286 | ||
6207d2f3 | 287 | /** @brief Start a subproces to send a mail message |
288 | * @param sender Sender address (can be "") | |
289 | * @param pubsender Visible sender address (must not be "") | |
290 | * @param recipient Recipient address | |
291 | * @param subject Subject string | |
292 | * @param encoding Body encoding | |
293 | * @param content_type Content-type of body | |
294 | * @param body Text of body (encoded, but \n for newline) | |
295 | * @return Subprocess PID on success, -1 on error | |
296 | */ | |
297 | pid_t sendmail_subprocess(const char *sender, | |
298 | const char *pubsender, | |
299 | const char *recipient, | |
300 | const char *subject, | |
301 | const char *encoding, | |
302 | const char *content_type, | |
303 | const char *body) { | |
304 | pid_t pid; | |
305 | ||
306 | if(!(pid = fork())) { | |
307 | exitfn = _exit; | |
308 | if(sendmail(sender, pubsender, recipient, subject, | |
309 | encoding, content_type, body)) | |
310 | _exit(1); | |
311 | _exit(0); | |
312 | } | |
313 | if(pid < 0) | |
314 | error(errno, "error calling fork"); | |
315 | return pid; | |
316 | } | |
317 | ||
bb6ae3fb | 318 | /* |
319 | Local Variables: | |
320 | c-basic-offset:2 | |
321 | comment-column:40 | |
322 | fill-column:79 | |
323 | indent-tabs-mode:nil | |
324 | End: | |
325 | */ |