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