1 /* vi: set sw=4 ts=4: */
3 * popmaildir: a simple yet powerful POP3 client
4 * Delivers contents of remote mailboxes to local Maildir
6 * Inspired by original utility by Nikola Vladov
8 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
10 * Licensed under GPLv2, see file LICENSE in this source tree.
15 static void pop3_checkr(const char *fmt, const char *param, char **ret)
17 char *msg = send_mail_command(fmt, param);
18 char *answer = xmalloc_fgetline(stdin);
19 if (answer && '+' == answer[0]) {
25 memmove(answer, answer + 4, strlen(answer) - 4);
31 bb_error_msg_and_die("%s failed, reply was: %s", msg, answer);
34 static void pop3_check(const char *fmt, const char *param)
36 pop3_checkr(fmt, param, NULL);
39 int popmaildir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
40 int popmaildir_main(int argc UNUSED_PARAM, char **argv)
47 #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
50 unsigned opt_nlines = 0;
53 OPT_b = 1 << 0, // -b binary mode. Ignored
54 OPT_d = 1 << 1, // -d,-dd,-ddd debug. Ignored
55 OPT_m = 1 << 2, // -m show used memory. Ignored
56 OPT_V = 1 << 3, // -V version. Ignored
57 OPT_c = 1 << 4, // -c use tcpclient. Ignored
58 OPT_a = 1 << 5, // -a use APOP protocol
59 OPT_s = 1 << 6, // -s skip authorization
60 OPT_T = 1 << 7, // -T get messages with TOP instead with RETR
61 OPT_k = 1 << 8, // -k keep retrieved messages on the server
62 OPT_t = 1 << 9, // -t90 set timeout to 90 sec
63 OPT_R = 1 << 10, // -R20000 remove old messages on the server >= 20000 bytes (requires -k). Ignored
64 OPT_Z = 1 << 11, // -Z11-23 remove messages from 11 to 23 (dangerous). Ignored
65 OPT_L = 1 << 12, // -L50000 not retrieve new messages >= 50000 bytes. Ignored
66 OPT_H = 1 << 13, // -H30 type first 30 lines of a message; (-L12000 -H30). Ignored
67 OPT_M = 1 << 14, // -M\"program arg1 arg2 ...\"; deliver by program. Treated like -F
68 OPT_F = 1 << 15, // -F\"program arg1 arg2 ...\"; filter by program. Treated like -M
71 // init global variables
75 opt_complementary = "-1:dd:t+:R+:L+:H+";
77 "bdmVcasTkt:" "R:Z:L:H:" IF_FEATURE_POPMAILDIR_DELIVERY("M:F:"),
78 &timeout, NULL, NULL, NULL, &opt_nlines
79 IF_FEATURE_POPMAILDIR_DELIVERY(, &delivery, &delivery) // we treat -M and -F the same
86 get_cred_or_die(STDIN_FILENO);
91 // launch connect helper, if any
93 launch_helper((const char **)argv);
95 // get server greeting
96 pop3_checkr(NULL, NULL, &buf);
98 // authenticate (if no -s given)
99 if (!(opts & OPT_s)) {
100 // server supports APOP and we want it?
101 if ('<' == buf[0] && (opts & OPT_a)) {
102 union { // save a bit of stack
104 char hex[16 * 2 + 1];
106 uint32_t res[16 / 4];
108 char *s = strchr(buf, '>');
111 // get md5 sum of "<stamp>password" string
113 md5_hash(&md5.ctx, buf, strlen(buf));
114 md5_hash(&md5.ctx, G.pass, strlen(G.pass));
115 md5_end(&md5.ctx, res);
116 *bin2hex(md5.hex, (char*)res, 16) = '\0';
118 s = xasprintf("%s %s", G.user, md5.hex);
119 pop3_check("APOP %s", s);
122 // server ignores APOP -> use simple text authentication
125 pop3_check("USER %s", G.user);
127 pop3_check("PASS %s", G.pass);
131 // get mailbox statistics
132 pop3_checkr("STAT", NULL, &buf);
134 // prepare message filename suffix
135 hostname = safe_gethostname();
138 // get messages counter
139 // NOTE: we don't use xatou(buf) since buf is "nmsg nbytes"
140 // we only need nmsg and atoi is just exactly what we need
141 // if atoi fails to convert buf into number it returns 0
142 // in this case the following loop simply will not be executed
146 // loop through messages
147 retr = (opts & OPT_T) ? xasprintf("TOP %%u %u", opt_nlines) : "RETR %u";
148 for (; nmsg; nmsg--) {
154 #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
157 // generate unique filename
158 filename = xasprintf("tmp/%llu.%u.%s",
159 monotonic_us(), (unsigned)pid, hostname);
161 // retrieve message in ./tmp/ unless filter is specified
162 pop3_check(retr, (const char *)(ptrdiff_t)nmsg);
164 #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
165 // delivery helper ordered? -> setup pipe
166 if (opts & (OPT_F|OPT_M)) {
167 // helper will have $FILENAME set to filename
168 xsetenv("FILENAME", filename);
169 fp = popen(delivery, "w");
170 unsetenv("FILENAME");
172 bb_perror_msg("delivery helper");
177 // create and open file filename
178 fp = xfopen_for_write(filename);
180 // copy stdin to fp (either filename or delivery helper)
181 while ((answer = xmalloc_fgets_str(stdin, "\r\n")) != NULL) {
183 if ('.' == answer[0]) {
184 if ('.' == answer[1])
186 else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3])
189 //*strchrnul(s, '\r') = '\n';
194 #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
195 // analyse delivery status
196 if (opts & (OPT_F|OPT_M)) {
198 if (99 == rc) // 99 means bail out
200 // if (rc) // !0 means skip to the next message
202 // // 0 means continue
209 // delete message from server
211 pop3_check("DELE %u", (const char*)(ptrdiff_t)nmsg);
213 // atomically move message to ./new/
214 target = xstrdup(filename);
215 strncpy(target, "new", 3);
216 // ... or just stop receiving on failure
217 if (rename_or_warn(filename, target))
221 #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
228 pop3_check("QUIT", NULL);
230 if (ENABLE_FEATURE_CLEAN_UP) {