bb6ae3fb |
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> |
31 | |
32 | #include "syscalls.h" |
33 | #include "log.h" |
34 | #include "configuration.h" |
35 | #include "inputline.h" |
36 | #include "addr.h" |
37 | #include "hostname.h" |
38 | #include "sendmail.h" |
39 | #include "base64.h" |
40 | |
41 | /** @brief Get a server response |
42 | * @param tag Server name |
43 | * @param in Input stream |
44 | * @return Response code 0-999 or -1 on error |
45 | */ |
46 | static int getresponse(const char *tag, FILE *in) { |
47 | char *line; |
48 | |
49 | while(!inputline(tag, in, &line, CRLF)) { |
50 | if(line[0] >= '0' && line[0] <= '9' |
51 | && line[1] >= '0' && line[1] <= '9' |
52 | && line[2] >= '0' && line[2] <= '9') { |
53 | const int rc = 10 * (10 * line[0] + line[1]) + line[2] - 111 * '0'; |
54 | if(rc >= 400 && rc <= 599) |
55 | error(0, "%s: %s", tag, line); |
56 | if(line[3] != '-') { |
57 | return rc; |
58 | } |
59 | /* else go round for further response lines */ |
60 | } else { |
61 | error(0, "%s: malformed response: %s", tag, line); |
62 | return -1; |
63 | } |
64 | } |
65 | if(ferror(in)) |
66 | error(errno, "%s: read error", tag); |
67 | else |
68 | error(0, "%s: server closed connection", tag); |
69 | return -1; |
70 | } |
71 | |
72 | /** @brief Send a command to the server |
73 | * @param tag Server name |
74 | * @param out stream to send commands to |
75 | * @param fmt Format string |
76 | * @return 0 on success, non-0 on error |
77 | */ |
78 | static int sendcommand(const char *tag, FILE *out, const char *fmt, ...) { |
79 | va_list ap; |
80 | int rc; |
81 | |
82 | va_start(ap, fmt); |
83 | rc = vfprintf(out, fmt, ap); |
84 | va_end(ap); |
85 | if(rc >= 0) |
86 | rc = fputs("\r\n", out); |
87 | if(rc >= 0) |
88 | rc = fflush(out); |
89 | if(rc >= 0) |
90 | return 0; |
91 | error(errno, "%s: write error", tag); |
92 | return -1; |
93 | } |
94 | |
95 | /** @brief Send a mail message |
96 | * @param tag Server name |
97 | * @param in Stream to read responses from |
98 | * @param out Stream to send commands to |
99 | * @param sender Sender address (can be "") |
100 | * @param pubsender Visible sender address (must not be "") |
101 | * @param recipient Recipient address |
102 | * @param subject Subject string |
103 | * @param encoding Body encoding |
104 | * @param body_type Content-type of body |
105 | * @param body Text of body (encoded, but \n for newline) |
106 | * @return 0 on success, non-0 on error |
107 | */ |
108 | static int sendmailfp(const char *tag, FILE *in, FILE *out, |
109 | const char *sender, |
110 | const char *pubsender, |
111 | const char *recipient, |
112 | const char *subject, |
113 | const char *encoding, |
114 | const char *content_type, |
115 | const char *body) { |
116 | int rc, sol = 1; |
117 | const char *ptr; |
118 | uint8_t idbuf[20]; |
119 | char *id; |
120 | |
121 | gcry_create_nonce(idbuf, sizeof idbuf); |
122 | id = mime_to_base64(idbuf, sizeof idbuf); |
123 | if((rc = getresponse(tag, in)) / 100 != 2) |
124 | return -1; |
125 | if(sendcommand(tag, out, "HELO %s", local_hostname())) |
126 | return -1; |
127 | if((rc = getresponse(tag, in)) / 100 != 2) |
128 | return -1; |
129 | if(sendcommand(tag, out, "MAIL FROM:<%s>", sender)) |
130 | return -1; |
131 | if((rc = getresponse(tag, in)) / 100 != 2) |
132 | return -1; |
133 | if(sendcommand(tag, out, "RCPT TO:<%s>", recipient)) |
134 | return -1; |
135 | if((rc = getresponse(tag, in)) / 100 != 2) |
136 | return -1; |
137 | if(sendcommand(tag, out, "DATA", sender)) |
138 | return -1; |
139 | if((rc = getresponse(tag, in)) / 100 != 3) |
140 | return -1; |
141 | if(fprintf(out, "From: %s\r\n", pubsender) < 0 |
142 | || fprintf(out, "To: %s\r\n", recipient) < 0 |
143 | || fprintf(out, "Subject: %s\r\n", subject) < 0 |
144 | || fprintf(out, "Message-ID: <%s@%s>\r\n", id, local_hostname()) < 0 |
145 | || fprintf(out, "MIME-Version: 1.0\r\n") < 0 |
146 | || fprintf(out, "Content-Type: %s\r\n", content_type) < 0 |
147 | || fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0 |
148 | || fprintf(out, "\r\n") < 0) { |
149 | write_error: |
150 | error(errno, "%s: write error", tag); |
151 | return -1; |
152 | } |
153 | for(ptr = body; *ptr; ++ptr) { |
154 | if(sol && *ptr == '.') |
155 | if(fputc('.', out) < 0) |
156 | goto write_error; |
157 | if(*ptr == '\n') { |
158 | if(fputc('\r', out) < 0) |
159 | goto write_error; |
160 | sol = 1; |
161 | } else |
162 | sol = 0; |
163 | if(fputc(*ptr, out) < 0) |
164 | goto write_error; |
165 | } |
166 | if(!sol) |
167 | if(fputs("\r\n", out) < 0) |
168 | goto write_error; |
169 | if(fprintf(out, ".\r\n") < 0 |
170 | || fflush(out) < 0) |
171 | goto write_error; |
172 | if((rc = getresponse(tag, in)) / 100 != 2) |
173 | return -1; |
174 | return 0; |
175 | } |
176 | |
177 | /** @brief Send a mail message |
178 | * @param sender Sender address (can be "") |
179 | * @param pubsender Visible sender address (must not be "") |
180 | * @param recipient Recipient address |
181 | * @param subject Subject string |
182 | * @param encoding Body encoding |
183 | * @param content_type Content-type of body |
184 | * @param body Text of body (encoded, but \n for newline) |
185 | * @return 0 on success, non-0 on error |
186 | * |
187 | * See mime_encode_text() for encoding of text bodies. |
188 | */ |
189 | int sendmail(const char *sender, |
190 | const char *pubsender, |
191 | const char *recipient, |
192 | const char *subject, |
193 | const char *encoding, |
194 | const char *content_type, |
195 | const char *body) { |
196 | struct stringlist a; |
197 | char *s[2]; |
198 | struct addrinfo *ai; |
199 | char *tag; |
200 | int fdin, fdout, rc; |
201 | FILE *in, *out; |
202 | |
203 | static const struct addrinfo pref = { |
204 | 0, |
205 | PF_INET, |
206 | SOCK_STREAM, |
207 | IPPROTO_TCP, |
208 | 0, |
209 | 0, |
210 | 0, |
211 | 0 |
212 | }; |
213 | |
214 | /* Find the SMTP server */ |
215 | a.n = 2; |
216 | a.s = s; |
217 | s[0] = config->smtp_server; |
218 | s[1] = (char *)"smtp"; |
219 | if(!(ai = get_address(&a, &pref, &tag))) |
220 | return -1; |
221 | fdin = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
222 | if(connect(fdin, ai->ai_addr, ai->ai_addrlen) < 0) { |
223 | error(errno, "error connecting to %s", tag); |
224 | xclose(fdin); |
225 | return -1; |
226 | } |
227 | if((fdout = dup(fdin)) < 0) |
228 | fatal(errno, "error calling dup2"); |
229 | if(!(in = fdopen(fdin, "rb"))) |
230 | fatal(errno, "error calling fdopen"); |
231 | if(!(out = fdopen(fdout, "wb"))) |
232 | fatal(errno, "error calling fdopen"); |
233 | rc = sendmailfp(tag, in, out, sender, pubsender, recipient, subject, |
234 | encoding, content_type, body); |
235 | fclose(in); |
236 | fclose(out); |
237 | return rc; |
238 | } |
239 | |
240 | /* |
241 | Local Variables: |
242 | c-basic-offset:2 |
243 | comment-column:40 |
244 | fill-column:79 |
245 | indent-tabs-mode:nil |
246 | End: |
247 | */ |