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Denis Vlasenko239d06b2008-11-06 23:42:42 +00001/* vi: set sw=4 ts=4: */
2/*
3 * bare bones sendmail
4 *
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
6 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02007 * Licensed under GPLv2, see file LICENSE in this source tree.
Denis Vlasenko239d06b2008-11-06 23:42:42 +00008 */
Denys Vlasenkoc19f7582016-11-23 09:58:03 +01009//config:config SENDMAIL
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020010//config: bool "sendmail (14 kb)"
Denys Vlasenkoc19f7582016-11-23 09:58:03 +010011//config: default y
12//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020013//config: Barebones sendmail.
Denys Vlasenkoc19f7582016-11-23 09:58:03 +010014
15//applet:IF_SENDMAIL(APPLET(sendmail, BB_DIR_USR_SBIN, BB_SUID_DROP))
Denys Vlasenko5707b522010-12-20 05:12:39 +010016
Denys Vlasenkod616ab62011-05-22 03:46:33 +020017//kbuild:lib-$(CONFIG_SENDMAIL) += sendmail.o mail.o
18
Denys Vlasenko5707b522010-12-20 05:12:39 +010019//usage:#define sendmail_trivial_usage
Denys Vlasenko9de75092016-07-14 19:14:54 +020020//usage: "[-tv] [-f SENDER] [-amLOGIN 4<user_pass.txt | -auUSER -apPASS]"
Denys Vlasenko2a4d7f42016-07-14 20:06:44 +020021//usage: "\n [-w SECS] [-H 'PROG ARGS' | -S HOST] [RECIPIENT_EMAIL]..."
Denys Vlasenko5707b522010-12-20 05:12:39 +010022//usage:#define sendmail_full_usage "\n\n"
23//usage: "Read email from stdin and send it\n"
24//usage: "\nStandard options:"
25//usage: "\n -t Read additional recipients from message body"
Denys Vlasenko07f417b2014-02-05 15:01:39 +010026//usage: "\n -f SENDER For use in MAIL FROM:<sender>. Can be empty string"
27//usage: "\n Default: -auUSER, or username of current UID"
Denys Vlasenko5707b522010-12-20 05:12:39 +010028//usage: "\n -o OPTIONS Various options. -oi implied, others are ignored"
Denys Vlasenko9de75092016-07-14 19:14:54 +020029//usage: "\n -i -oi synonym, implied and ignored"
Denys Vlasenko5707b522010-12-20 05:12:39 +010030//usage: "\n"
31//usage: "\nBusybox specific options:"
32//usage: "\n -v Verbose"
33//usage: "\n -w SECS Network timeout"
Denys Vlasenko9de75092016-07-14 19:14:54 +020034//usage: "\n -H 'PROG ARGS' Run connection helper. Examples:"
35//usage: "\n openssl s_client -quiet -tls1 -starttls smtp -connect smtp.gmail.com:25"
36//usage: "\n openssl s_client -quiet -tls1 -connect smtp.gmail.com:465"
Denys Vlasenkob9f56e82016-09-07 13:16:33 +020037//usage: "\n $SMTP_ANTISPAM_DELAY: seconds to wait after helper connect"
Denys Vlasenko9de75092016-07-14 19:14:54 +020038//usage: "\n -S HOST[:PORT] Server (default $SMTPHOST or 127.0.0.1)"
39//usage: "\n -amLOGIN Log in using AUTH LOGIN (-amCRAM-MD5 not supported)"
40//usage: "\n -auUSER Username for AUTH"
41//usage: "\n -apPASS Password for AUTH"
Denys Vlasenko5707b522010-12-20 05:12:39 +010042//usage: "\n"
Denys Vlasenko9de75092016-07-14 19:14:54 +020043//usage: "\nIf no -a options are given, authentication is not done."
44//usage: "\nIf -amLOGIN is given but no -au/-ap, user/password is read from fd #4."
45//usage: "\nOther options are silently ignored; -oi is implied."
Denys Vlasenko5707b522010-12-20 05:12:39 +010046//usage: IF_MAKEMIME(
Denys Vlasenko9de75092016-07-14 19:14:54 +020047//usage: "\nUse makemime to create emails with attachments."
Denys Vlasenko5707b522010-12-20 05:12:39 +010048//usage: )
49
Denys Vlasenko07f417b2014-02-05 15:01:39 +010050/* Currently we don't sanitize or escape user-supplied SENDER and RECIPIENT_EMAILs.
51 * We may need to do so. For one, '.' in usernames seems to require escaping!
52 *
53 * From http://cr.yp.to/smtp/address.html:
54 *
55 * SMTP offers three ways to encode a character inside an address:
56 *
57 * "safe": the character, if it is not <>()[].,;:@, backslash,
58 * double-quote, space, or an ASCII control character;
59 * "quoted": the character, if it is not \012, \015, backslash,
60 * or double-quote; or
61 * "slashed": backslash followed by the character.
62 *
63 * An encoded box part is either (1) a sequence of one or more slashed
64 * or safe characters or (2) a double quote, a sequence of zero or more
65 * slashed or quoted characters, and a double quote. It represents
66 * the concatenation of the characters encoded inside it.
67 *
68 * For example, the encoded box parts
69 * angels
70 * \a\n\g\e\l\s
71 * "\a\n\g\e\l\s"
72 * "angels"
73 * "ang\els"
74 * all represent the 6-byte string "angels", and the encoded box parts
75 * a\,comma
76 * \a\,\c\o\m\m\a
77 * "a,comma"
78 * all represent the 7-byte string "a,comma".
79 *
80 * An encoded address contains
81 * the byte <;
82 * optionally, a route followed by a colon;
83 * an encoded box part, the byte @, and a domain; and
84 * the byte >.
85 *
86 * It represents an Internet mail address, given by concatenating
87 * the string represented by the encoded box part, the byte @,
88 * and the domain. For example, the encoded addresses
89 * <God@heaven.af.mil>
90 * <\God@heaven.af.mil>
91 * <"God"@heaven.af.mil>
92 * <@gateway.af.mil,@uucp.local:"\G\o\d"@heaven.af.mil>
93 * all represent the Internet mail address "God@heaven.af.mil".
94 */
95
Denis Vlasenko239d06b2008-11-06 23:42:42 +000096#include "libbb.h"
97#include "mail.h"
98
Vladimir Dronnikov944d2752009-10-15 23:50:48 +020099// limit maximum allowed number of headers to prevent overflows.
100// set to 0 to not limit
101#define MAX_HEADERS 256
102
Denys Vlasenko5707b522010-12-20 05:12:39 +0100103static void send_r_n(const char *s)
104{
105 if (verbose)
106 bb_error_msg("send:'%s'", s);
107 printf("%s\r\n", s);
108}
109
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000110static int smtp_checkp(const char *fmt, const char *param, int code)
111{
112 char *answer;
Denys Vlasenko5707b522010-12-20 05:12:39 +0100113 char *msg = send_mail_command(fmt, param);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000114 // read stdin
Denys Vlasenko5707b522010-12-20 05:12:39 +0100115 // if the string has a form NNN- -- read next string. E.g. EHLO response
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000116 // parse first bytes to a number
117 // if code = -1 then just return this number
118 // if code != -1 then checks whether the number equals the code
119 // if not equal -> die saying msg
Denys Vlasenko5707b522010-12-20 05:12:39 +0100120 while ((answer = xmalloc_fgetline(stdin)) != NULL) {
Denys Vlasenko51d714c2010-12-20 12:19:46 +0100121 if (verbose)
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200122 bb_error_msg("recv:'%.*s'", (int)(strchrnul(answer, '\r') - answer), answer);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000123 if (strlen(answer) <= 3 || '-' != answer[3])
124 break;
Denys Vlasenko5707b522010-12-20 05:12:39 +0100125 free(answer);
126 }
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000127 if (answer) {
128 int n = atoi(answer);
129 if (timeout)
130 alarm(0);
131 free(answer);
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200132 if (-1 == code || n == code) {
133 free(msg);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000134 return n;
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200135 }
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000136 }
137 bb_error_msg_and_die("%s failed", msg);
138}
139
140static int smtp_check(const char *fmt, int code)
141{
142 return smtp_checkp(fmt, NULL, code);
143}
144
145// strip argument of bad chars
146static char *sane_address(char *str)
147{
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100148 char *s;
Aaro Koskinen14285d12013-02-25 00:45:06 +0200149
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100150 trim(str);
151 s = str;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000152 while (*s) {
Denys Vlasenko1121b4e2017-10-05 17:18:23 +0200153 /* Standard allows these chars in username without quoting:
154 * /!#$%&'*+-=?^_`{|}~
155 * and allows dot (.) with some restrictions.
156 * I chose to only allow a saner subset.
157 * I propose to expand it only on user's request.
158 */
159 if (!isalnum(*s) && !strchr("=+_-.@", *s)) {
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100160 bb_error_msg("bad address '%s'", str);
161 /* returning "": */
162 str[0] = '\0';
163 return str;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000164 }
165 s++;
166 }
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000167 return str;
168}
169
Aaro Koskinen06ad9642013-02-25 00:45:08 +0200170// check for an address inside angle brackets, if not found fall back to normal
171static char *angle_address(char *str)
172{
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100173 char *s, *e;
Aaro Koskinen06ad9642013-02-25 00:45:08 +0200174
Denys Vlasenko20077c12017-08-05 17:50:35 +0200175 e = trim(str);
Raffaello D. Di Napoli6f097852018-06-26 19:18:02 -0400176 if (e != str && *--e == '>') {
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100177 s = strrchr(str, '<');
178 if (s) {
179 *e = '\0';
180 str = s + 1;
181 }
182 }
183 return sane_address(str);
Aaro Koskinen06ad9642013-02-25 00:45:08 +0200184}
185
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000186static void rcptto(const char *s)
187{
Aaro Koskinen14285d12013-02-25 00:45:06 +0200188 if (!*s)
189 return;
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200190 // N.B. we don't die if recipient is rejected, for the other recipients may be accepted
191 if (250 != smtp_checkp("RCPT TO:<%s>", s, -1))
192 bb_error_msg("Bad recipient: <%s>", s);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000193}
194
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200195// send to a list of comma separated addresses
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100196static void rcptto_list(const char *list)
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200197{
Denys Vlasenko3505e382017-08-22 15:53:16 +0200198 char *free_me = xstrdup(list);
199 char *str = free_me;
200 char *s = free_me;
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200201 char prev = 0;
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100202 int in_quote = 0;
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200203
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100204 while (*s) {
205 char ch = *s++;
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200206
207 if (ch == '"' && prev != '\\') {
208 in_quote = !in_quote;
209 } else if (!in_quote && ch == ',') {
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100210 s[-1] = '\0';
211 rcptto(angle_address(str));
212 str = s;
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200213 }
214 prev = ch;
215 }
216 if (prev != ',')
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100217 rcptto(angle_address(str));
Denys Vlasenko3505e382017-08-22 15:53:16 +0200218 free(free_me);
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200219}
220
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000221int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
222int sendmail_main(int argc UNUSED_PARAM, char **argv)
223{
Denys Vlasenkob9f56e82016-09-07 13:16:33 +0200224 char *opt_connect;
Denys Vlasenko07f417b2014-02-05 15:01:39 +0100225 char *opt_from = NULL;
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000226 char *s;
227 llist_t *list = NULL;
Ron Yorston576b1d32012-04-28 17:04:19 +0200228 char *host = sane_address(safe_gethostname());
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200229 unsigned nheaders = 0;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000230 int code;
Aaro Koskinen236f2222013-02-25 00:45:10 +0200231 enum {
232 HDR_OTHER = 0,
233 HDR_TOCC,
234 HDR_BCC,
235 } last_hdr = 0;
236 int check_hdr;
Aaro Koskinen4a732222013-02-25 00:45:11 +0200237 int has_to = 0;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000238
239 enum {
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000240 //--- standard options
241 OPT_t = 1 << 0, // read message for recipients, append them to those on cmdline
242 OPT_f = 1 << 1, // sender address
243 OPT_o = 1 << 2, // various options. -oi IMPLIED! others are IGNORED!
Vladimir Dronnikovb618dba2009-10-04 01:34:54 +0200244 OPT_i = 1 << 3, // IMPLIED!
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000245 //--- BB specific options
Vladimir Dronnikovb618dba2009-10-04 01:34:54 +0200246 OPT_w = 1 << 4, // network timeout
247 OPT_H = 1 << 5, // use external connection helper
248 OPT_S = 1 << 6, // specify connection string
249 OPT_a = 1 << 7, // authentication tokens
Denys Vlasenko5707b522010-12-20 05:12:39 +0100250 OPT_v = 1 << 8, // verbosity
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000251 };
252
253 // init global variables
254 INIT_G();
255
Denys Vlasenkob9f56e82016-09-07 13:16:33 +0200256 // default HOST[:PORT] is $SMTPHOST, or localhost
257 opt_connect = getenv("SMTPHOST");
258 if (!opt_connect)
259 opt_connect = (char *)"127.0.0.1";
260
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000261 // save initial stdin since body is piped!
262 xdup2(STDIN_FILENO, 3);
Denys Vlasenkoa7ccdee2009-11-15 23:28:11 +0100263 G.fp0 = xfdopen_for_read(3);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000264
265 // parse options
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000266 // N.B. since -H and -S are mutually exclusive they do not interfere in opt_connect
267 // -a is for ssmtp (http://downloads.openwrt.org/people/nico/man/man8/ssmtp.8.html) compatibility,
268 // it is still under development.
Denys Vlasenko22542ec2017-08-08 21:55:02 +0200269 opts = getopt32(argv, "^"
270 "tf:o:iw:+H:S:a:*:v"
271 "\0"
272 // -v is a counter, -H and -S are mutually exclusive, -a is a list
273 "vv:H--S:S--H",
274 &opt_from, NULL,
275 &timeout, &opt_connect, &opt_connect, &list, &verbose
276 );
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000277 //argc -= optind;
278 argv += optind;
279
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000280 // process -a[upm]<token> options
281 if ((opts & OPT_a) && !list)
282 bb_show_usage();
283 while (list) {
284 char *a = (char *) llist_pop(&list);
285 if ('u' == a[0])
286 G.user = xstrdup(a+1);
287 if ('p' == a[0])
288 G.pass = xstrdup(a+1);
289 // N.B. we support only AUTH LOGIN so far
290 //if ('m' == a[0])
291 // G.method = xstrdup(a+1);
292 }
293 // N.B. list == NULL here
Denys Vlasenko76b680c2016-03-30 16:04:37 +0200294 //bb_error_msg("OPT[%x] AU[%s], AP[%s], AM[%s], ARGV[%s]", opts, au, ap, am, *argv);
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000295
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000296 // connect to server
297
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000298 // connection helper ordered? ->
299 if (opts & OPT_H) {
Denys Vlasenkob9f56e82016-09-07 13:16:33 +0200300 const char *delay;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000301 const char *args[] = { "sh", "-c", opt_connect, NULL };
302 // plug it in
303 launch_helper(args);
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200304 // Now:
305 // our stdout will go to helper's stdin,
306 // helper's stdout will be available on our stdin.
307
308 // Wait for initial server message.
309 // If helper (such as openssl) invokes STARTTLS, the initial 220
310 // is swallowed by helper (and not repeated after TLS is initiated).
311 // We will send NOOP cmd to server and check the response.
312 // We should get 220+250 on plain connection, 250 on STARTTLSed session.
313 //
314 // The problem here is some servers delay initial 220 message,
315 // and consider client to be a spammer if it starts sending cmds
316 // before 220 reached it. The code below is unsafe in this regard:
317 // in non-STARTTLSed case, we potentially send NOOP before 220
318 // is sent by server.
Denys Vlasenkob9f56e82016-09-07 13:16:33 +0200319 //
320 // If $SMTP_ANTISPAM_DELAY is set, we pause before sending NOOP.
321 //
322 delay = getenv("SMTP_ANTISPAM_DELAY");
323 if (delay)
324 sleep(atoi(delay));
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200325 code = smtp_check("NOOP", -1);
326 if (code == 220)
327 // we got 220 - this is not STARTTLSed connection,
328 // eat 250 response to our NOOP
329 smtp_check(NULL, 250);
330 else
331 if (code != 250)
332 bb_error_msg_and_die("SMTP init failed");
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000333 } else {
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200334 // vanilla connection
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000335 int fd;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000336 fd = create_and_connect_stream_or_die(opt_connect, 25);
337 // and make ourselves a simple IO filter
338 xmove_fd(fd, STDIN_FILENO);
339 xdup2(STDIN_FILENO, STDOUT_FILENO);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000340
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200341 // Wait for initial server 220 message
342 smtp_check(NULL, 220);
343 }
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000344
345 // we should start with modern EHLO
Ron Yorston576b1d32012-04-28 17:04:19 +0200346 if (250 != smtp_checkp("EHLO %s", host, -1))
347 smtp_checkp("HELO %s", host, 250);
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000348
349 // perform authentication
350 if (opts & OPT_a) {
351 smtp_check("AUTH LOGIN", 334);
352 // we must read credentials unless they are given via -a[up] options
353 if (!G.user || !G.pass)
354 get_cred_or_die(4);
355 encode_base64(NULL, G.user, NULL);
356 smtp_check("", 334);
357 encode_base64(NULL, G.pass, NULL);
358 smtp_check("", 235);
359 }
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000360
361 // set sender
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200362 // N.B. we have here a very loosely defined algorythm
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000363 // since sendmail historically offers no means to specify secrets on cmdline.
364 // 1) server can require no authentication ->
365 // we must just provide a (possibly fake) reply address.
366 // 2) server can require AUTH ->
367 // we must provide valid username and password along with a (possibly fake) reply address.
368 // For the sake of security username and password are to be read either from console or from a secured file.
369 // Since reading from console may defeat usability, the solution is either to read from a predefined
370 // file descriptor (e.g. 4), or again from a secured file.
371
Denys Vlasenko07f417b2014-02-05 15:01:39 +0100372 // got no sender address? use auth name, then UID username as a last resort
373 if (!opt_from) {
Kaarle Ritvanen4e03d412014-02-09 09:49:36 +0100374 opt_from = xasprintf("%s@%s",
375 G.user ? G.user : xuid2uname(getuid()),
376 xgethostbyname(host)->h_name);
Denys Vlasenko07f417b2014-02-05 15:01:39 +0100377 }
Kaarle Ritvanen4e03d412014-02-09 09:49:36 +0100378 free(host);
Denys Vlasenko07f417b2014-02-05 15:01:39 +0100379
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000380 smtp_checkp("MAIL FROM:<%s>", opt_from, 250);
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000381
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000382 // process message
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000383
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000384 // read recipients from message and add them to those given on cmdline.
385 // this means we scan stdin for To:, Cc:, Bcc: lines until an empty line
386 // and then use the rest of stdin as message body
387 code = 0; // set "analyze headers" mode
388 while ((s = xmalloc_fgetline(G.fp0)) != NULL) {
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200389 dump:
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000390 // put message lines doubling leading dots
391 if (code) {
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000392 // escape leading dots
393 // N.B. this feature is implied even if no -i (-oi) switch given
394 // N.B. we need to escape the leading dot regardless of
395 // whether it is single or not character on the line
396 if ('.' == s[0] /*&& '\0' == s[1] */)
Denys Vlasenkod60752f2015-10-07 22:42:45 +0200397 bb_putchar('.');
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000398 // dump read line
Denys Vlasenko5707b522010-12-20 05:12:39 +0100399 send_r_n(s);
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000400 free(s);
401 continue;
402 }
403
404 // analyze headers
405 // To: or Cc: headers add recipients
Denys Vlasenkoa42f5302013-03-18 18:47:16 +0100406 check_hdr = (0 == strncasecmp("To:", s, 3));
Aaro Koskinen4a732222013-02-25 00:45:11 +0200407 has_to |= check_hdr;
Denys Vlasenko41fea012011-11-18 22:25:35 +0100408 if (opts & OPT_t) {
Aaro Koskinen4a732222013-02-25 00:45:11 +0200409 if (check_hdr || 0 == strncasecmp("Bcc:" + 1, s, 3)) {
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200410 rcptto_list(s+3);
Aaro Koskinen236f2222013-02-25 00:45:10 +0200411 last_hdr = HDR_TOCC;
Denys Vlasenko41fea012011-11-18 22:25:35 +0100412 goto addheader;
413 }
414 // Bcc: header adds blind copy (hidden) recipient
415 if (0 == strncasecmp("Bcc:", s, 4)) {
Aaro Koskinena8ba0a02013-02-25 00:45:09 +0200416 rcptto_list(s+4);
Denys Vlasenko41fea012011-11-18 22:25:35 +0100417 free(s);
Aaro Koskinen236f2222013-02-25 00:45:10 +0200418 last_hdr = HDR_BCC;
Denys Vlasenko41fea012011-11-18 22:25:35 +0100419 continue; // N.B. Bcc: vanishes from headers!
420 }
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200421 }
Aaro Koskinene82bfef2013-02-25 00:45:12 +0200422 check_hdr = (list && isspace(s[0]));
Aaro Koskinen236f2222013-02-25 00:45:10 +0200423 if (strchr(s, ':') || check_hdr) {
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200424 // other headers go verbatim
425 // N.B. RFC2822 2.2.3 "Long Header Fields" allows for headers to occupy several lines.
426 // Continuation is denoted by prefixing additional lines with whitespace(s).
427 // Thanks (stefan.seyfried at googlemail.com) for pointing this out.
Aaro Koskinen236f2222013-02-25 00:45:10 +0200428 if (check_hdr && last_hdr != HDR_OTHER) {
429 rcptto_list(s+1);
430 if (last_hdr == HDR_BCC)
431 continue;
432 // N.B. Bcc: vanishes from headers!
433 } else {
434 last_hdr = HDR_OTHER;
435 }
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200436 addheader:
Vladimir Dronnikov8dbe9bb2009-10-17 03:35:10 +0200437 // N.B. we allow MAX_HEADERS generic headers at most to prevent attacks
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200438 if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)
439 goto bail;
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000440 llist_add_to_end(&list, s);
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000441 } else {
Denys Vlasenko34c469a2011-09-18 03:01:49 +0200442 // a line without ":" (an empty line too, by definition) doesn't look like a valid header
443 // so stop "analyze headers" mode
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200444 reenter:
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000445 // put recipients specified on cmdline
Aaro Koskinene82bfef2013-02-25 00:45:12 +0200446 check_hdr = 1;
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000447 while (*argv) {
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200448 char *t = sane_address(*argv);
449 rcptto(t);
450 //if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)
451 // goto bail;
Aaro Koskinene82bfef2013-02-25 00:45:12 +0200452 if (!has_to) {
453 const char *hdr;
454
455 if (check_hdr && argv[1])
456 hdr = "To: %s,";
457 else if (check_hdr)
458 hdr = "To: %s";
459 else if (argv[1])
460 hdr = "To: %s," + 3;
461 else
462 hdr = "To: %s" + 3;
Aaro Koskinen4a732222013-02-25 00:45:11 +0200463 llist_add_to_end(&list,
Aaro Koskinene82bfef2013-02-25 00:45:12 +0200464 xasprintf(hdr, t));
465 check_hdr = 0;
466 }
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000467 argv++;
468 }
469 // enter "put message" mode
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200470 // N.B. DATA fails iff no recipients were accepted (or even provided)
471 // in this case just bail out gracefully
472 if (354 != smtp_check("DATA", -1))
473 goto bail;
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000474 // dump the headers
475 while (list) {
Denys Vlasenko5707b522010-12-20 05:12:39 +0100476 send_r_n((char *) llist_pop(&list));
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000477 }
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000478 // stop analyzing headers
479 code++;
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200480 // N.B. !s means: we read nothing, and nothing to be read in the future.
481 // just dump empty line and break the loop
482 if (!s) {
Denys Vlasenko5707b522010-12-20 05:12:39 +0100483 send_r_n("");
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200484 break;
485 }
486 // go dump message body
487 // N.B. "s" already contains the first non-header line, so pretend we read it from input
488 goto dump;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000489 }
490 }
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200491 // odd case: we didn't stop "analyze headers" mode -> message body is empty. Reenter the loop
492 // N.B. after reenter code will be > 0
493 if (!code)
494 goto reenter;
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000495
Denis Vlasenko88b8f0a2009-03-31 23:41:53 +0000496 // finalize the message
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000497 smtp_check(".", 250);
Vladimir Dronnikov944d2752009-10-15 23:50:48 +0200498 bail:
Denis Vlasenko239d06b2008-11-06 23:42:42 +0000499 // ... and say goodbye
500 smtp_check("QUIT", 221);
501 // cleanup
502 if (ENABLE_FEATURE_CLEAN_UP)
503 fclose(G.fp0);
504
505 return EXIT_SUCCESS;
506}