[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * popmaildir: a simple yet powerful POP3 client
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| 4 | * Delivers contents of remote mailboxes to local Maildir
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| 5 | *
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| 6 | * Inspired by original utility by Nikola Vladov
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| 7 | *
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| 8 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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| 9 | *
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| 10 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 11 | */
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[3232] | 12 |
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| 13 | //kbuild:lib-$(CONFIG_POPMAILDIR) += popmaildir.o mail.o
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| 14 |
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| 15 | //usage:#define popmaildir_trivial_usage
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| 16 | //usage: "[OPTIONS] MAILDIR [CONN_HELPER ARGS]"
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| 17 | //usage:#define popmaildir_full_usage "\n\n"
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| 18 | //usage: "Fetch content of remote mailbox to local maildir\n"
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| 19 | /* //usage: "\n -b Binary mode. Ignored" */
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| 20 | /* //usage: "\n -d Debug. Ignored" */
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| 21 | /* //usage: "\n -m Show used memory. Ignored" */
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| 22 | /* //usage: "\n -V Show version. Ignored" */
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| 23 | /* //usage: "\n -c Use tcpclient. Ignored" */
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| 24 | /* //usage: "\n -a Use APOP protocol. Implied. If server supports APOP -> use it" */
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| 25 | //usage: "\n -s Skip authorization"
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| 26 | //usage: "\n -T Get messages with TOP instead of RETR"
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| 27 | //usage: "\n -k Keep retrieved messages on the server"
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| 28 | //usage: "\n -t SEC Network timeout"
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| 29 | //usage: IF_FEATURE_POPMAILDIR_DELIVERY(
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| 30 | //usage: "\n -F \"PROG ARGS\" Filter program (may be repeated)"
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| 31 | //usage: "\n -M \"PROG ARGS\" Delivery program"
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| 32 | //usage: )
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| 33 | //usage: "\n"
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| 34 | //usage: "\nFetch from plain POP3 server:"
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| 35 | //usage: "\npopmaildir -k DIR nc pop3.server.com 110 <user_and_pass.txt"
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| 36 | //usage: "\nFetch from SSLed POP3 server and delete fetched emails:"
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| 37 | //usage: "\npopmaildir DIR -- openssl s_client -quiet -connect pop3.server.com:995 <user_and_pass.txt"
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| 38 | /* //usage: "\n -R BYTES Remove old messages on the server >= BYTES. Ignored" */
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| 39 | /* //usage: "\n -Z N1-N2 Remove messages from N1 to N2 (dangerous). Ignored" */
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| 40 | /* //usage: "\n -L BYTES Don't retrieve new messages >= BYTES. Ignored" */
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| 41 | /* //usage: "\n -H LINES Type first LINES of a message. Ignored" */
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| 42 | //usage:
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| 43 | //usage:#define popmaildir_example_usage
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| 44 | //usage: "$ popmaildir -k ~/Maildir -- nc pop.drvv.ru 110 [<password_file]\n"
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| 45 | //usage: "$ popmaildir ~/Maildir -- openssl s_client -quiet -connect pop.gmail.com:995 [<password_file]\n"
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| 46 |
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[2725] | 47 | #include "libbb.h"
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| 48 | #include "mail.h"
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| 49 |
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| 50 | static void pop3_checkr(const char *fmt, const char *param, char **ret)
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| 51 | {
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[3232] | 52 | char *msg = send_mail_command(fmt, param);
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[2725] | 53 | char *answer = xmalloc_fgetline(stdin);
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| 54 | if (answer && '+' == answer[0]) {
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[3232] | 55 | free(msg);
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[2725] | 56 | if (timeout)
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| 57 | alarm(0);
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| 58 | if (ret) {
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| 59 | // skip "+OK "
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| 60 | memmove(answer, answer + 4, strlen(answer) - 4);
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| 61 | *ret = answer;
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| 62 | } else
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| 63 | free(answer);
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| 64 | return;
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| 65 | }
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[3232] | 66 | bb_error_msg_and_die("%s failed, reply was: %s", msg, answer);
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[2725] | 67 | }
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| 68 |
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| 69 | static void pop3_check(const char *fmt, const char *param)
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| 70 | {
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| 71 | pop3_checkr(fmt, param, NULL);
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| 72 | }
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| 73 |
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| 74 | int popmaildir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 75 | int popmaildir_main(int argc UNUSED_PARAM, char **argv)
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| 76 | {
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| 77 | char *buf;
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| 78 | unsigned nmsg;
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| 79 | char *hostname;
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| 80 | pid_t pid;
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| 81 | const char *retr;
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| 82 | #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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| 83 | const char *delivery;
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| 84 | #endif
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| 85 | unsigned opt_nlines = 0;
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| 86 |
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| 87 | enum {
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| 88 | OPT_b = 1 << 0, // -b binary mode. Ignored
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| 89 | OPT_d = 1 << 1, // -d,-dd,-ddd debug. Ignored
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| 90 | OPT_m = 1 << 2, // -m show used memory. Ignored
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| 91 | OPT_V = 1 << 3, // -V version. Ignored
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| 92 | OPT_c = 1 << 4, // -c use tcpclient. Ignored
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| 93 | OPT_a = 1 << 5, // -a use APOP protocol
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| 94 | OPT_s = 1 << 6, // -s skip authorization
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| 95 | OPT_T = 1 << 7, // -T get messages with TOP instead with RETR
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| 96 | OPT_k = 1 << 8, // -k keep retrieved messages on the server
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| 97 | OPT_t = 1 << 9, // -t90 set timeout to 90 sec
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| 98 | OPT_R = 1 << 10, // -R20000 remove old messages on the server >= 20000 bytes (requires -k). Ignored
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| 99 | OPT_Z = 1 << 11, // -Z11-23 remove messages from 11 to 23 (dangerous). Ignored
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| 100 | OPT_L = 1 << 12, // -L50000 not retrieve new messages >= 50000 bytes. Ignored
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| 101 | OPT_H = 1 << 13, // -H30 type first 30 lines of a message; (-L12000 -H30). Ignored
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| 102 | OPT_M = 1 << 14, // -M\"program arg1 arg2 ...\"; deliver by program. Treated like -F
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| 103 | OPT_F = 1 << 15, // -F\"program arg1 arg2 ...\"; filter by program. Treated like -M
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| 104 | };
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| 105 |
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| 106 | // init global variables
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| 107 | INIT_G();
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| 108 |
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| 109 | // parse options
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| 110 | opt_complementary = "-1:dd:t+:R+:L+:H+";
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| 111 | opts = getopt32(argv,
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| 112 | "bdmVcasTkt:" "R:Z:L:H:" IF_FEATURE_POPMAILDIR_DELIVERY("M:F:"),
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| 113 | &timeout, NULL, NULL, NULL, &opt_nlines
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| 114 | IF_FEATURE_POPMAILDIR_DELIVERY(, &delivery, &delivery) // we treat -M and -F the same
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| 115 | );
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| 116 | //argc -= optind;
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| 117 | argv += optind;
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| 118 |
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| 119 | // get auth info
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| 120 | if (!(opts & OPT_s))
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| 121 | get_cred_or_die(STDIN_FILENO);
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| 122 |
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| 123 | // goto maildir
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| 124 | xchdir(*argv++);
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| 125 |
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| 126 | // launch connect helper, if any
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| 127 | if (*argv)
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| 128 | launch_helper((const char **)argv);
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| 129 |
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| 130 | // get server greeting
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| 131 | pop3_checkr(NULL, NULL, &buf);
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| 132 |
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| 133 | // authenticate (if no -s given)
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| 134 | if (!(opts & OPT_s)) {
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| 135 | // server supports APOP and we want it?
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| 136 | if ('<' == buf[0] && (opts & OPT_a)) {
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| 137 | union { // save a bit of stack
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| 138 | md5_ctx_t ctx;
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| 139 | char hex[16 * 2 + 1];
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| 140 | } md5;
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| 141 | uint32_t res[16 / 4];
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| 142 |
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| 143 | char *s = strchr(buf, '>');
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| 144 | if (s)
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| 145 | s[1] = '\0';
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| 146 | // get md5 sum of "<stamp>password" string
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| 147 | md5_begin(&md5.ctx);
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| 148 | md5_hash(&md5.ctx, buf, strlen(buf));
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| 149 | md5_hash(&md5.ctx, G.pass, strlen(G.pass));
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| 150 | md5_end(&md5.ctx, res);
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| 151 | *bin2hex(md5.hex, (char*)res, 16) = '\0';
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| 152 | // APOP
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| 153 | s = xasprintf("%s %s", G.user, md5.hex);
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| 154 | pop3_check("APOP %s", s);
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| 155 | free(s);
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| 156 | free(buf);
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| 157 | // server ignores APOP -> use simple text authentication
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| 158 | } else {
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| 159 | // USER
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| 160 | pop3_check("USER %s", G.user);
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| 161 | // PASS
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| 162 | pop3_check("PASS %s", G.pass);
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| 163 | }
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| 164 | }
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| 165 |
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| 166 | // get mailbox statistics
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| 167 | pop3_checkr("STAT", NULL, &buf);
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| 168 |
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| 169 | // prepare message filename suffix
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| 170 | hostname = safe_gethostname();
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| 171 | pid = getpid();
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| 172 |
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| 173 | // get messages counter
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| 174 | // NOTE: we don't use xatou(buf) since buf is "nmsg nbytes"
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| 175 | // we only need nmsg and atoi is just exactly what we need
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| 176 | // if atoi fails to convert buf into number it returns 0
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| 177 | // in this case the following loop simply will not be executed
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| 178 | nmsg = atoi(buf);
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| 179 | free(buf);
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| 180 |
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| 181 | // loop through messages
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| 182 | retr = (opts & OPT_T) ? xasprintf("TOP %%u %u", opt_nlines) : "RETR %u";
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| 183 | for (; nmsg; nmsg--) {
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| 184 |
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| 185 | char *filename;
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| 186 | char *target;
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| 187 | char *answer;
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| 188 | FILE *fp;
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| 189 | #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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| 190 | int rc;
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| 191 | #endif
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| 192 | // generate unique filename
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| 193 | filename = xasprintf("tmp/%llu.%u.%s",
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| 194 | monotonic_us(), (unsigned)pid, hostname);
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| 195 |
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| 196 | // retrieve message in ./tmp/ unless filter is specified
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| 197 | pop3_check(retr, (const char *)(ptrdiff_t)nmsg);
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| 198 |
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| 199 | #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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| 200 | // delivery helper ordered? -> setup pipe
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| 201 | if (opts & (OPT_F|OPT_M)) {
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| 202 | // helper will have $FILENAME set to filename
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| 203 | xsetenv("FILENAME", filename);
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| 204 | fp = popen(delivery, "w");
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| 205 | unsetenv("FILENAME");
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| 206 | if (!fp) {
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| 207 | bb_perror_msg("delivery helper");
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| 208 | break;
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| 209 | }
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| 210 | } else
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| 211 | #endif
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| 212 | // create and open file filename
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| 213 | fp = xfopen_for_write(filename);
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| 214 |
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| 215 | // copy stdin to fp (either filename or delivery helper)
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| 216 | while ((answer = xmalloc_fgets_str(stdin, "\r\n")) != NULL) {
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| 217 | char *s = answer;
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| 218 | if ('.' == answer[0]) {
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| 219 | if ('.' == answer[1])
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| 220 | s++;
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| 221 | else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3])
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| 222 | break;
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| 223 | }
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| 224 | //*strchrnul(s, '\r') = '\n';
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| 225 | fputs(s, fp);
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| 226 | free(answer);
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| 227 | }
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| 228 |
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| 229 | #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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| 230 | // analyse delivery status
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| 231 | if (opts & (OPT_F|OPT_M)) {
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| 232 | rc = pclose(fp);
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| 233 | if (99 == rc) // 99 means bail out
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| 234 | break;
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| 235 | // if (rc) // !0 means skip to the next message
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| 236 | goto skip;
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| 237 | // // 0 means continue
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| 238 | } else {
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| 239 | // close filename
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| 240 | fclose(fp);
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| 241 | }
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| 242 | #endif
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| 243 |
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| 244 | // delete message from server
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| 245 | if (!(opts & OPT_k))
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| 246 | pop3_check("DELE %u", (const char*)(ptrdiff_t)nmsg);
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| 247 |
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| 248 | // atomically move message to ./new/
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| 249 | target = xstrdup(filename);
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| 250 | strncpy(target, "new", 3);
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| 251 | // ... or just stop receiving on failure
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| 252 | if (rename_or_warn(filename, target))
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| 253 | break;
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| 254 | free(target);
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| 255 |
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| 256 | #if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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| 257 | skip:
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| 258 | #endif
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| 259 | free(filename);
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| 260 | }
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| 261 |
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| 262 | // Bye
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| 263 | pop3_check("QUIT", NULL);
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| 264 |
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| 265 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 266 | free(G.user);
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| 267 | free(G.pass);
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| 268 | }
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| 269 |
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| 270 | return EXIT_SUCCESS;
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| 271 | }
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