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1 | /* |
2 | * This file is part of DisOrder |
3 | * Copyright (C) 2007 Richard Kettlewell |
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, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * 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 |
18 | * USA |
19 | */ |
20 | |
21 | #include <config.h> |
22 | #include "types.h" |
23 | |
24 | #include <stdio.h> |
25 | #include <errno.h> |
26 | #include <stdarg.h> |
27 | #include <sys/socket.h> |
28 | #include <netdb.h> |
29 | #include <unistd.h> |
30 | #include <gcrypt.h> |
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31 | #include <time.h> |
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32 | #include <netinet/in.h> |
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33 | |
34 | #include "syscalls.h" |
35 | #include "log.h" |
36 | #include "configuration.h" |
37 | #include "inputline.h" |
38 | #include "addr.h" |
39 | #include "hostname.h" |
40 | #include "sendmail.h" |
41 | #include "base64.h" |
42 | |
43 | /** @brief Get a server response |
44 | * @param tag Server name |
45 | * @param in Input stream |
46 | * @return Response code 0-999 or -1 on error |
47 | */ |
48 | static int getresponse(const char *tag, FILE *in) { |
49 | char *line; |
50 | |
51 | while(!inputline(tag, in, &line, CRLF)) { |
52 | if(line[0] >= '0' && line[0] <= '9' |
53 | && line[1] >= '0' && line[1] <= '9' |
54 | && line[2] >= '0' && line[2] <= '9') { |
55 | const int rc = 10 * (10 * line[0] + line[1]) + line[2] - 111 * '0'; |
56 | if(rc >= 400 && rc <= 599) |
57 | error(0, "%s: %s", tag, line); |
58 | if(line[3] != '-') { |
59 | return rc; |
60 | } |
61 | /* else go round for further response lines */ |
62 | } else { |
63 | error(0, "%s: malformed response: %s", tag, line); |
64 | return -1; |
65 | } |
66 | } |
67 | if(ferror(in)) |
68 | error(errno, "%s: read error", tag); |
69 | else |
70 | error(0, "%s: server closed connection", tag); |
71 | return -1; |
72 | } |
73 | |
74 | /** @brief Send a command to the server |
75 | * @param tag Server name |
76 | * @param out stream to send commands to |
77 | * @param fmt Format string |
78 | * @return 0 on success, non-0 on error |
79 | */ |
80 | static int sendcommand(const char *tag, FILE *out, const char *fmt, ...) { |
81 | va_list ap; |
82 | int rc; |
83 | |
84 | va_start(ap, fmt); |
85 | rc = vfprintf(out, fmt, ap); |
86 | va_end(ap); |
87 | if(rc >= 0) |
88 | rc = fputs("\r\n", out); |
89 | if(rc >= 0) |
90 | rc = fflush(out); |
91 | if(rc >= 0) |
92 | return 0; |
93 | error(errno, "%s: write error", tag); |
94 | return -1; |
95 | } |
96 | |
97 | /** @brief Send a mail message |
98 | * @param tag Server name |
99 | * @param in Stream to read responses from |
100 | * @param out Stream to send commands to |
101 | * @param sender Sender address (can be "") |
102 | * @param pubsender Visible sender address (must not be "") |
103 | * @param recipient Recipient address |
104 | * @param subject Subject string |
105 | * @param encoding Body encoding |
106 | * @param body_type Content-type of body |
107 | * @param body Text of body (encoded, but \n for newline) |
108 | * @return 0 on success, non-0 on error |
109 | */ |
110 | static int sendmailfp(const char *tag, FILE *in, FILE *out, |
111 | const char *sender, |
112 | const char *pubsender, |
113 | const char *recipient, |
114 | const char *subject, |
115 | const char *encoding, |
116 | const char *content_type, |
117 | const char *body) { |
118 | int rc, sol = 1; |
119 | const char *ptr; |
120 | uint8_t idbuf[20]; |
121 | char *id; |
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122 | struct tm ut; |
123 | time_t now; |
124 | char date[128]; |
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125 | |
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126 | time(&now); |
127 | gmtime_r(&now, &ut); |
128 | strftime(date, sizeof date, "%a, %d %b %Y %H:%M:%S +0000", &ut); |
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129 | gcry_create_nonce(idbuf, sizeof idbuf); |
130 | id = mime_to_base64(idbuf, sizeof idbuf); |
131 | if((rc = getresponse(tag, in)) / 100 != 2) |
132 | return -1; |
133 | if(sendcommand(tag, out, "HELO %s", local_hostname())) |
134 | return -1; |
135 | if((rc = getresponse(tag, in)) / 100 != 2) |
136 | return -1; |
137 | if(sendcommand(tag, out, "MAIL FROM:<%s>", sender)) |
138 | return -1; |
139 | if((rc = getresponse(tag, in)) / 100 != 2) |
140 | return -1; |
141 | if(sendcommand(tag, out, "RCPT TO:<%s>", recipient)) |
142 | return -1; |
143 | if((rc = getresponse(tag, in)) / 100 != 2) |
144 | return -1; |
145 | if(sendcommand(tag, out, "DATA", sender)) |
146 | return -1; |
147 | if((rc = getresponse(tag, in)) / 100 != 3) |
148 | return -1; |
149 | if(fprintf(out, "From: %s\r\n", pubsender) < 0 |
150 | || fprintf(out, "To: %s\r\n", recipient) < 0 |
151 | || fprintf(out, "Subject: %s\r\n", subject) < 0 |
152 | || fprintf(out, "Message-ID: <%s@%s>\r\n", id, local_hostname()) < 0 |
153 | || fprintf(out, "MIME-Version: 1.0\r\n") < 0 |
154 | || fprintf(out, "Content-Type: %s\r\n", content_type) < 0 |
155 | || fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0 |
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156 | || fprintf(out, "Date: %s\r\n", date) < 0 |
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157 | || fprintf(out, "\r\n") < 0) { |
158 | write_error: |
159 | error(errno, "%s: write error", tag); |
160 | return -1; |
161 | } |
162 | for(ptr = body; *ptr; ++ptr) { |
163 | if(sol && *ptr == '.') |
164 | if(fputc('.', out) < 0) |
165 | goto write_error; |
166 | if(*ptr == '\n') { |
167 | if(fputc('\r', out) < 0) |
168 | goto write_error; |
169 | sol = 1; |
170 | } else |
171 | sol = 0; |
172 | if(fputc(*ptr, out) < 0) |
173 | goto write_error; |
174 | } |
175 | if(!sol) |
176 | if(fputs("\r\n", out) < 0) |
177 | goto write_error; |
178 | if(fprintf(out, ".\r\n") < 0 |
179 | || fflush(out) < 0) |
180 | goto write_error; |
181 | if((rc = getresponse(tag, in)) / 100 != 2) |
182 | return -1; |
183 | return 0; |
184 | } |
185 | |
186 | /** @brief Send a mail message |
187 | * @param sender Sender address (can be "") |
188 | * @param pubsender Visible sender address (must not be "") |
189 | * @param recipient Recipient address |
190 | * @param subject Subject string |
191 | * @param encoding Body encoding |
192 | * @param content_type Content-type of body |
193 | * @param body Text of body (encoded, but \n for newline) |
194 | * @return 0 on success, non-0 on error |
195 | * |
196 | * See mime_encode_text() for encoding of text bodies. |
197 | */ |
198 | int sendmail(const char *sender, |
199 | const char *pubsender, |
200 | const char *recipient, |
201 | const char *subject, |
202 | const char *encoding, |
203 | const char *content_type, |
204 | const char *body) { |
205 | struct stringlist a; |
206 | char *s[2]; |
207 | struct addrinfo *ai; |
208 | char *tag; |
209 | int fdin, fdout, rc; |
210 | FILE *in, *out; |
211 | |
212 | static const struct addrinfo pref = { |
213 | 0, |
214 | PF_INET, |
215 | SOCK_STREAM, |
216 | IPPROTO_TCP, |
217 | 0, |
218 | 0, |
219 | 0, |
220 | 0 |
221 | }; |
222 | |
223 | /* Find the SMTP server */ |
224 | a.n = 2; |
225 | a.s = s; |
226 | s[0] = config->smtp_server; |
227 | s[1] = (char *)"smtp"; |
228 | if(!(ai = get_address(&a, &pref, &tag))) |
229 | return -1; |
230 | fdin = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
231 | if(connect(fdin, ai->ai_addr, ai->ai_addrlen) < 0) { |
232 | error(errno, "error connecting to %s", tag); |
233 | xclose(fdin); |
234 | return -1; |
235 | } |
236 | if((fdout = dup(fdin)) < 0) |
237 | fatal(errno, "error calling dup2"); |
238 | if(!(in = fdopen(fdin, "rb"))) |
239 | fatal(errno, "error calling fdopen"); |
240 | if(!(out = fdopen(fdout, "wb"))) |
241 | fatal(errno, "error calling fdopen"); |
242 | rc = sendmailfp(tag, in, out, sender, pubsender, recipient, subject, |
243 | encoding, content_type, body); |
244 | fclose(in); |
245 | fclose(out); |
246 | return rc; |
247 | } |
248 | |
249 | /* |
250 | Local Variables: |
251 | c-basic-offset:2 |
252 | comment-column:40 |
253 | fill-column:79 |
254 | indent-tabs-mode:nil |
255 | End: |
256 | */ |