mirror of
https://github.com/topjohnwu/ndk-busybox.git
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72089cf6b4
Those two spaces after tab have no effect, and always a nuisance when editing. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
290 lines
8.5 KiB
C
290 lines
8.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* popmaildir: a simple yet powerful POP3 client
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* Delivers contents of remote mailboxes to local Maildir
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*
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* Inspired by original utility by Nikola Vladov
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*
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* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config POPMAILDIR
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//config: bool "popmaildir (10 kb)"
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//config: default y
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//config: help
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//config: Simple yet powerful POP3 mail popper. Delivers content
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//config: of remote mailboxes to local Maildir.
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//config:
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//config:config FEATURE_POPMAILDIR_DELIVERY
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//config: bool "Allow message filters and custom delivery program"
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//config: default y
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//config: depends on POPMAILDIR
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//config: help
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//config: Allow to use a custom program to filter the content
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//config: of the message before actual delivery (-F "prog [args...]").
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//config: Allow to use a custom program for message actual delivery
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//config: (-M "prog [args...]").
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//applet:IF_POPMAILDIR(APPLET(popmaildir, BB_DIR_USR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_POPMAILDIR) += popmaildir.o mail.o
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//usage:#define popmaildir_trivial_usage
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//usage: "[OPTIONS] MAILDIR [CONN_HELPER ARGS]"
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//usage:#define popmaildir_full_usage "\n\n"
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//usage: "Fetch content of remote mailbox to local maildir\n"
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/* //usage: "\n -b Binary mode. Ignored" */
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/* //usage: "\n -d Debug. Ignored" */
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/* //usage: "\n -m Show used memory. Ignored" */
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/* //usage: "\n -V Show version. Ignored" */
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/* //usage: "\n -c Use tcpclient. Ignored" */
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/* //usage: "\n -a Use APOP protocol. Implied. If server supports APOP -> use it" */
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//usage: "\n -s Skip authorization"
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//usage: "\n -T Get messages with TOP instead of RETR"
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//usage: "\n -k Keep retrieved messages on the server"
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//usage: "\n -t SEC Network timeout"
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//usage: IF_FEATURE_POPMAILDIR_DELIVERY(
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//usage: "\n -F \"PROG ARGS\" Filter program (may be repeated)"
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//usage: "\n -M \"PROG ARGS\" Delivery program"
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//usage: )
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//usage: "\n"
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//usage: "\nFetch from plain POP3 server:"
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//usage: "\npopmaildir -k DIR nc pop3.server.com 110 <user_and_pass.txt"
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//usage: "\nFetch from SSLed POP3 server and delete fetched emails:"
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//usage: "\npopmaildir DIR -- openssl s_client -quiet -connect pop3.server.com:995 <user_and_pass.txt"
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/* //usage: "\n -R BYTES Remove old messages on the server >= BYTES. Ignored" */
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/* //usage: "\n -Z N1-N2 Remove messages from N1 to N2 (dangerous). Ignored" */
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/* //usage: "\n -L BYTES Don't retrieve new messages >= BYTES. Ignored" */
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/* //usage: "\n -H LINES Type first LINES of a message. Ignored" */
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//usage:
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//usage:#define popmaildir_example_usage
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//usage: "$ popmaildir -k ~/Maildir -- nc pop.drvv.ru 110 [<password_file]\n"
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//usage: "$ popmaildir ~/Maildir -- openssl s_client -quiet -connect pop.gmail.com:995 [<password_file]\n"
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#include "libbb.h"
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#include "mail.h"
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static void pop3_checkr(const char *fmt, const char *param, char **ret)
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{
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char *msg = send_mail_command(fmt, param);
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char *answer = xmalloc_fgetline(stdin);
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if (answer && '+' == answer[0]) {
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free(msg);
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if (timeout)
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alarm(0);
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if (ret) {
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// skip "+OK "
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memmove(answer, answer + 4, strlen(answer) - 4);
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*ret = answer;
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} else
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free(answer);
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return;
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}
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bb_error_msg_and_die("%s failed, reply was: %s", msg, answer);
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}
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static void pop3_check(const char *fmt, const char *param)
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{
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pop3_checkr(fmt, param, NULL);
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}
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int popmaildir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int popmaildir_main(int argc UNUSED_PARAM, char **argv)
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{
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char *buf;
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unsigned nmsg;
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char *hostname;
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pid_t pid;
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const char *retr;
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#if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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const char *delivery;
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#endif
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unsigned opt_nlines = 0;
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enum {
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OPT_b = 1 << 0, // -b binary mode. Ignored
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OPT_d = 1 << 1, // -d,-dd,-ddd debug. Ignored
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OPT_m = 1 << 2, // -m show used memory. Ignored
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OPT_V = 1 << 3, // -V version. Ignored
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OPT_c = 1 << 4, // -c use tcpclient. Ignored
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OPT_a = 1 << 5, // -a use APOP protocol
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OPT_s = 1 << 6, // -s skip authorization
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OPT_T = 1 << 7, // -T get messages with TOP instead with RETR
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OPT_k = 1 << 8, // -k keep retrieved messages on the server
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OPT_t = 1 << 9, // -t90 set timeout to 90 sec
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OPT_R = 1 << 10, // -R20000 remove old messages on the server >= 20000 bytes (requires -k). Ignored
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OPT_Z = 1 << 11, // -Z11-23 remove messages from 11 to 23 (dangerous). Ignored
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OPT_L = 1 << 12, // -L50000 not retrieve new messages >= 50000 bytes. Ignored
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OPT_H = 1 << 13, // -H30 type first 30 lines of a message; (-L12000 -H30). Ignored
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OPT_M = 1 << 14, // -M\"program arg1 arg2 ...\"; deliver by program. Treated like -F
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OPT_F = 1 << 15, // -F\"program arg1 arg2 ...\"; filter by program. Treated like -M
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};
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// init global variables
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INIT_G();
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// parse options
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opt_complementary = "-1:dd";
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opts = getopt32(argv,
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"bdmVcasTkt:+" "R:+Z:L:+H:+" IF_FEATURE_POPMAILDIR_DELIVERY("M:F:"),
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&timeout, NULL, NULL, NULL, &opt_nlines
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IF_FEATURE_POPMAILDIR_DELIVERY(, &delivery, &delivery) // we treat -M and -F the same
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);
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//argc -= optind;
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argv += optind;
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// get auth info
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if (!(opts & OPT_s))
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get_cred_or_die(STDIN_FILENO);
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// goto maildir
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xchdir(*argv++);
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// launch connect helper, if any
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if (*argv)
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launch_helper((const char **)argv);
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// get server greeting
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pop3_checkr(NULL, NULL, &buf);
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// authenticate (if no -s given)
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if (!(opts & OPT_s)) {
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// server supports APOP and we want it?
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if ('<' == buf[0] && (opts & OPT_a)) {
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union { // save a bit of stack
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md5_ctx_t ctx;
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char hex[16 * 2 + 1];
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} md5;
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uint32_t res[16 / 4];
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char *s = strchr(buf, '>');
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if (s)
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s[1] = '\0';
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// get md5 sum of "<stamp>password" string
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md5_begin(&md5.ctx);
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md5_hash(&md5.ctx, buf, strlen(buf));
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md5_hash(&md5.ctx, G.pass, strlen(G.pass));
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md5_end(&md5.ctx, res);
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*bin2hex(md5.hex, (char*)res, 16) = '\0';
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// APOP
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s = xasprintf("%s %s", G.user, md5.hex);
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pop3_check("APOP %s", s);
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free(s);
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free(buf);
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// server ignores APOP -> use simple text authentication
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} else {
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// USER
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pop3_check("USER %s", G.user);
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// PASS
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pop3_check("PASS %s", G.pass);
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}
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}
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// get mailbox statistics
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pop3_checkr("STAT", NULL, &buf);
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// prepare message filename suffix
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hostname = safe_gethostname();
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pid = getpid();
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// get messages counter
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// NOTE: we don't use xatou(buf) since buf is "nmsg nbytes"
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// we only need nmsg and atoi is just exactly what we need
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// if atoi fails to convert buf into number it returns 0
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// in this case the following loop simply will not be executed
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nmsg = atoi(buf);
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free(buf);
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// loop through messages
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retr = (opts & OPT_T) ? xasprintf("TOP %%u %u", opt_nlines) : "RETR %u";
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for (; nmsg; nmsg--) {
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char *filename;
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char *target;
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char *answer;
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FILE *fp;
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#if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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int rc;
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#endif
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// generate unique filename
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filename = xasprintf("tmp/%llu.%u.%s",
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monotonic_us(), (unsigned)pid, hostname);
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// retrieve message in ./tmp/ unless filter is specified
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pop3_check(retr, (const char *)(ptrdiff_t)nmsg);
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#if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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// delivery helper ordered? -> setup pipe
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if (opts & (OPT_F|OPT_M)) {
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// helper will have $FILENAME set to filename
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xsetenv("FILENAME", filename);
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fp = popen(delivery, "w");
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unsetenv("FILENAME");
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if (!fp) {
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bb_perror_msg("delivery helper");
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break;
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}
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} else
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#endif
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// create and open file filename
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fp = xfopen_for_write(filename);
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// copy stdin to fp (either filename or delivery helper)
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while ((answer = xmalloc_fgets_str(stdin, "\r\n")) != NULL) {
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char *s = answer;
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if ('.' == answer[0]) {
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if ('.' == answer[1])
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s++;
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else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3])
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break;
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}
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//*strchrnul(s, '\r') = '\n';
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fputs(s, fp);
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free(answer);
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}
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#if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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// analyse delivery status
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if (opts & (OPT_F|OPT_M)) {
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rc = pclose(fp);
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if (99 == rc) // 99 means bail out
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break;
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// if (rc) // !0 means skip to the next message
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goto skip;
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// // 0 means continue
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} else {
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// close filename
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fclose(fp);
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}
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#endif
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// delete message from server
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if (!(opts & OPT_k))
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pop3_check("DELE %u", (const char*)(ptrdiff_t)nmsg);
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// atomically move message to ./new/
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target = xstrdup(filename);
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strncpy(target, "new", 3);
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// ... or just stop receiving on failure
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if (rename_or_warn(filename, target))
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break;
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free(target);
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#if ENABLE_FEATURE_POPMAILDIR_DELIVERY
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skip:
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#endif
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free(filename);
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}
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// Bye
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pop3_check("QUIT", NULL);
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(G.user);
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free(G.pass);
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}
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return EXIT_SUCCESS;
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}
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