/* vi: set sw=4 ts=4: */ /* * popmaildir: a simple yet powerful POP3 client * Delivers contents of remote mailboxes to local Maildir * * Inspired by original utility by Nikola Vladov * * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com> * * Licensed under GPLv2, see file LICENSE in this source tree. */ //config:config POPMAILDIR //config: bool "popmaildir" //config: default y //config: help //config: Simple yet powerful POP3 mail popper. Delivers content //config: of remote mailboxes to local Maildir. //config: //config:config FEATURE_POPMAILDIR_DELIVERY //config: bool "Allow message filters and custom delivery program" //config: default y //config: depends on POPMAILDIR //config: help //config: Allow to use a custom program to filter the content //config: of the message before actual delivery (-F "prog [args...]"). //config: Allow to use a custom program for message actual delivery //config: (-M "prog [args...]"). //applet:IF_POPMAILDIR(APPLET(popmaildir, BB_DIR_USR_SBIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_POPMAILDIR) += popmaildir.o mail.o //usage:#define popmaildir_trivial_usage //usage: "[OPTIONS] MAILDIR [CONN_HELPER ARGS]" //usage:#define popmaildir_full_usage "\n\n" //usage: "Fetch content of remote mailbox to local maildir\n" /* //usage: "\n -b Binary mode. Ignored" */ /* //usage: "\n -d Debug. Ignored" */ /* //usage: "\n -m Show used memory. Ignored" */ /* //usage: "\n -V Show version. Ignored" */ /* //usage: "\n -c Use tcpclient. Ignored" */ /* //usage: "\n -a Use APOP protocol. Implied. If server supports APOP -> use it" */ //usage: "\n -s Skip authorization" //usage: "\n -T Get messages with TOP instead of RETR" //usage: "\n -k Keep retrieved messages on the server" //usage: "\n -t SEC Network timeout" //usage: IF_FEATURE_POPMAILDIR_DELIVERY( //usage: "\n -F \"PROG ARGS\" Filter program (may be repeated)" //usage: "\n -M \"PROG ARGS\" Delivery program" //usage: ) //usage: "\n" //usage: "\nFetch from plain POP3 server:" //usage: "\npopmaildir -k DIR nc pop3.server.com 110 <user_and_pass.txt" //usage: "\nFetch from SSLed POP3 server and delete fetched emails:" //usage: "\npopmaildir DIR -- openssl s_client -quiet -connect pop3.server.com:995 <user_and_pass.txt" /* //usage: "\n -R BYTES Remove old messages on the server >= BYTES. Ignored" */ /* //usage: "\n -Z N1-N2 Remove messages from N1 to N2 (dangerous). Ignored" */ /* //usage: "\n -L BYTES Don't retrieve new messages >= BYTES. Ignored" */ /* //usage: "\n -H LINES Type first LINES of a message. Ignored" */ //usage: //usage:#define popmaildir_example_usage //usage: "$ popmaildir -k ~/Maildir -- nc pop.drvv.ru 110 [<password_file]\n" //usage: "$ popmaildir ~/Maildir -- openssl s_client -quiet -connect pop.gmail.com:995 [<password_file]\n" #include "libbb.h" #include "mail.h" static void pop3_checkr(const char *fmt, const char *param, char **ret) { char *msg = send_mail_command(fmt, param); char *answer = xmalloc_fgetline(stdin); if (answer && '+' == answer[0]) { free(msg); if (timeout) alarm(0); if (ret) { // skip "+OK " memmove(answer, answer + 4, strlen(answer) - 4); *ret = answer; } else free(answer); return; } bb_error_msg_and_die("%s failed, reply was: %s", msg, answer); } static void pop3_check(const char *fmt, const char *param) { pop3_checkr(fmt, param, NULL); } int popmaildir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int popmaildir_main(int argc UNUSED_PARAM, char **argv) { char *buf; unsigned nmsg; char *hostname; pid_t pid; const char *retr; #if ENABLE_FEATURE_POPMAILDIR_DELIVERY const char *delivery; #endif unsigned opt_nlines = 0; enum { OPT_b = 1 << 0, // -b binary mode. Ignored OPT_d = 1 << 1, // -d,-dd,-ddd debug. Ignored OPT_m = 1 << 2, // -m show used memory. Ignored OPT_V = 1 << 3, // -V version. Ignored OPT_c = 1 << 4, // -c use tcpclient. Ignored OPT_a = 1 << 5, // -a use APOP protocol OPT_s = 1 << 6, // -s skip authorization OPT_T = 1 << 7, // -T get messages with TOP instead with RETR OPT_k = 1 << 8, // -k keep retrieved messages on the server OPT_t = 1 << 9, // -t90 set timeout to 90 sec OPT_R = 1 << 10, // -R20000 remove old messages on the server >= 20000 bytes (requires -k). Ignored OPT_Z = 1 << 11, // -Z11-23 remove messages from 11 to 23 (dangerous). Ignored OPT_L = 1 << 12, // -L50000 not retrieve new messages >= 50000 bytes. Ignored OPT_H = 1 << 13, // -H30 type first 30 lines of a message; (-L12000 -H30). Ignored OPT_M = 1 << 14, // -M\"program arg1 arg2 ...\"; deliver by program. Treated like -F OPT_F = 1 << 15, // -F\"program arg1 arg2 ...\"; filter by program. Treated like -M }; // init global variables INIT_G(); // parse options opt_complementary = "-1:dd"; opts = getopt32(argv, "bdmVcasTkt:+" "R:+Z:L:+H:+" IF_FEATURE_POPMAILDIR_DELIVERY("M:F:"), &timeout, NULL, NULL, NULL, &opt_nlines IF_FEATURE_POPMAILDIR_DELIVERY(, &delivery, &delivery) // we treat -M and -F the same ); //argc -= optind; argv += optind; // get auth info if (!(opts & OPT_s)) get_cred_or_die(STDIN_FILENO); // goto maildir xchdir(*argv++); // launch connect helper, if any if (*argv) launch_helper((const char **)argv); // get server greeting pop3_checkr(NULL, NULL, &buf); // authenticate (if no -s given) if (!(opts & OPT_s)) { // server supports APOP and we want it? if ('<' == buf[0] && (opts & OPT_a)) { union { // save a bit of stack md5_ctx_t ctx; char hex[16 * 2 + 1]; } md5; uint32_t res[16 / 4]; char *s = strchr(buf, '>'); if (s) s[1] = '\0'; // get md5 sum of "<stamp>password" string md5_begin(&md5.ctx); md5_hash(&md5.ctx, buf, strlen(buf)); md5_hash(&md5.ctx, G.pass, strlen(G.pass)); md5_end(&md5.ctx, res); *bin2hex(md5.hex, (char*)res, 16) = '\0'; // APOP s = xasprintf("%s %s", G.user, md5.hex); pop3_check("APOP %s", s); free(s); free(buf); // server ignores APOP -> use simple text authentication } else { // USER pop3_check("USER %s", G.user); // PASS pop3_check("PASS %s", G.pass); } } // get mailbox statistics pop3_checkr("STAT", NULL, &buf); // prepare message filename suffix hostname = safe_gethostname(); pid = getpid(); // get messages counter // NOTE: we don't use xatou(buf) since buf is "nmsg nbytes" // we only need nmsg and atoi is just exactly what we need // if atoi fails to convert buf into number it returns 0 // in this case the following loop simply will not be executed nmsg = atoi(buf); free(buf); // loop through messages retr = (opts & OPT_T) ? xasprintf("TOP %%u %u", opt_nlines) : "RETR %u"; for (; nmsg; nmsg--) { char *filename; char *target; char *answer; FILE *fp; #if ENABLE_FEATURE_POPMAILDIR_DELIVERY int rc; #endif // generate unique filename filename = xasprintf("tmp/%llu.%u.%s", monotonic_us(), (unsigned)pid, hostname); // retrieve message in ./tmp/ unless filter is specified pop3_check(retr, (const char *)(ptrdiff_t)nmsg); #if ENABLE_FEATURE_POPMAILDIR_DELIVERY // delivery helper ordered? -> setup pipe if (opts & (OPT_F|OPT_M)) { // helper will have $FILENAME set to filename xsetenv("FILENAME", filename); fp = popen(delivery, "w"); unsetenv("FILENAME"); if (!fp) { bb_perror_msg("delivery helper"); break; } } else #endif // create and open file filename fp = xfopen_for_write(filename); // copy stdin to fp (either filename or delivery helper) while ((answer = xmalloc_fgets_str(stdin, "\r\n")) != NULL) { char *s = answer; if ('.' == answer[0]) { if ('.' == answer[1]) s++; else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3]) break; } //*strchrnul(s, '\r') = '\n'; fputs(s, fp); free(answer); } #if ENABLE_FEATURE_POPMAILDIR_DELIVERY // analyse delivery status if (opts & (OPT_F|OPT_M)) { rc = pclose(fp); if (99 == rc) // 99 means bail out break; // if (rc) // !0 means skip to the next message goto skip; // // 0 means continue } else { // close filename fclose(fp); } #endif // delete message from server if (!(opts & OPT_k)) pop3_check("DELE %u", (const char*)(ptrdiff_t)nmsg); // atomically move message to ./new/ target = xstrdup(filename); strncpy(target, "new", 3); // ... or just stop receiving on failure if (rename_or_warn(filename, target)) break; free(target); #if ENABLE_FEATURE_POPMAILDIR_DELIVERY skip: #endif free(filename); } // Bye pop3_check("QUIT", NULL); if (ENABLE_FEATURE_CLEAN_UP) { free(G.user); free(G.pass); } return EXIT_SUCCESS; }