which sets same handler for many signals. sig_catch is nuked (bb_signals_recursive is more descriptive name). *: use them as appropriate. function old new delta bb_signals_recursive - 95 +95 bb_signals - 52 +52 run_command 258 273 +15 svlogd_main 1368 1377 +9 runsv_main 1746 1752 +6 runsvdir_main 1643 1646 +3 UNSPEC_print 64 66 +2 time_main 1128 1127 -1 ... resize_main 246 210 -36 sig_catch 63 - -63 set_fatal_sighandler 85 14 -71 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 5/24 up/down: 182/-548) Total: -366 bytes
536 lines
12 KiB
C
536 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* bare bones sendmail/fetchmail
|
|
*
|
|
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
|
|
*
|
|
* Licensed under GPLv2, see file LICENSE in this tarball for details.
|
|
*/
|
|
#include "libbb.h"
|
|
|
|
#define INITIAL_STDIN_FILENO 3
|
|
|
|
static void uuencode(char *fname, const char *text)
|
|
{
|
|
enum {
|
|
SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */
|
|
DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
|
|
};
|
|
|
|
#define src_buf text
|
|
int fd;
|
|
#define len fd
|
|
char dst_buf[DST_BUF_SIZE + 1];
|
|
|
|
if (fname) {
|
|
fd = INITIAL_STDIN_FILENO;
|
|
if (NOT_LONE_DASH(fname))
|
|
fd = xopen(fname, O_RDONLY);
|
|
src_buf = bb_common_bufsiz1;
|
|
} else {
|
|
len = strlen(text);
|
|
}
|
|
|
|
fflush(stdout); // sync stdio and unistd output
|
|
while (1) {
|
|
size_t size;
|
|
if (fname) {
|
|
size = full_read(fd, (char *)src_buf, SRC_BUF_SIZE);
|
|
if ((ssize_t)size < 0)
|
|
bb_perror_msg_and_die(bb_msg_read_error);
|
|
} else {
|
|
size = len;
|
|
if (len > SRC_BUF_SIZE)
|
|
size = SRC_BUF_SIZE;
|
|
}
|
|
if (!size)
|
|
break;
|
|
// encode the buffer we just read in
|
|
bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
|
|
if (fname) {
|
|
xwrite(STDOUT_FILENO, "\r\n", 2);
|
|
} else {
|
|
src_buf += size;
|
|
len -= size;
|
|
}
|
|
xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
|
|
}
|
|
if (fname)
|
|
close(fd);
|
|
}
|
|
|
|
static pid_t helper_pid;
|
|
|
|
static void kill_helper(void)
|
|
{
|
|
// TODO!!!: is there more elegant way to terminate child on program failure?
|
|
if (helper_pid > 0)
|
|
kill(helper_pid, SIGTERM);
|
|
}
|
|
|
|
// generic signal handler
|
|
static void signal_handler(int signo)
|
|
{
|
|
int err;
|
|
|
|
if (SIGALRM == signo) {
|
|
kill_helper();
|
|
bb_error_msg_and_die("timed out");
|
|
}
|
|
|
|
// SIGCHLD. reap zombies
|
|
if (wait_any_nohang(&err) > 0)
|
|
if (WIFEXITED(err) && WEXITSTATUS(err))
|
|
#if ENABLE_FEATURE_SENDMAIL_BLOATY
|
|
bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err));
|
|
#else
|
|
bb_error_msg_and_die("child failed");
|
|
#endif
|
|
}
|
|
|
|
static void launch_helper(const char **argv)
|
|
{
|
|
// setup vanilla unidirectional pipes interchange
|
|
int idx;
|
|
int pipes[4];
|
|
xpipe(pipes);
|
|
xpipe(pipes+2);
|
|
helper_pid = vfork();
|
|
if (helper_pid < 0)
|
|
bb_perror_msg_and_die("vfork");
|
|
idx = (!helper_pid)*2;
|
|
xdup2(pipes[idx], STDIN_FILENO);
|
|
xdup2(pipes[3-idx], STDOUT_FILENO);
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
for (int i = 4; --i >= 0; )
|
|
if (pipes[i] > STDOUT_FILENO)
|
|
close(pipes[i]);
|
|
if (!helper_pid) {
|
|
// child - try to execute connection helper
|
|
BB_EXECVP(argv[0], (char **)argv);
|
|
_exit(127);
|
|
}
|
|
// parent - check whether child is alive
|
|
bb_signals_recursive(0
|
|
+ (1 << SIGCHLD)
|
|
+ (1 << SIGALRM)
|
|
, signal_handler);
|
|
signal_handler(SIGCHLD);
|
|
// child seems OK -> parent goes on
|
|
}
|
|
|
|
static unsigned timeout;
|
|
|
|
static char *command(const char *fmt, const char *param)
|
|
{
|
|
char *msg = (char *)fmt;
|
|
alarm(timeout);
|
|
if (msg) {
|
|
// if (param)
|
|
msg = xasprintf(fmt, param);
|
|
printf("%s\r\n", msg);
|
|
}
|
|
fflush(stdout);
|
|
return msg;
|
|
}
|
|
|
|
static int smtp_checkp(const char *fmt, const char *param, int code)
|
|
{
|
|
char *answer;
|
|
char *msg = command(fmt, param);
|
|
// read stdin
|
|
// if the string has a form \d\d\d- -- read next string. E.g. EHLO response
|
|
// parse first bytes to a number
|
|
// if code = -1 then just return this number
|
|
// if code != -1 then checks whether the number equals the code
|
|
// if not equal -> die saying msg
|
|
#if ENABLE_FEATURE_SENDMAIL_EHLO
|
|
while ((answer = xmalloc_getline(stdin)) && '-' == answer[3]) ;
|
|
#else
|
|
answer = xmalloc_getline(stdin);
|
|
#endif
|
|
if (answer) {
|
|
int n = atoi(answer);
|
|
alarm(0);
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
free(msg);
|
|
free(answer);
|
|
}
|
|
if (-1 == code || n == code) {
|
|
return n;
|
|
}
|
|
}
|
|
kill_helper();
|
|
bb_error_msg_and_die("%s failed", msg);
|
|
}
|
|
|
|
static int smtp_check(const char *fmt, int code)
|
|
{
|
|
return smtp_checkp(fmt, NULL, code);
|
|
}
|
|
|
|
static void pop3_checkr(const char *fmt, const char *param, char **ret)
|
|
{
|
|
char *msg = command(fmt, param);
|
|
char *answer = xmalloc_getline(stdin);
|
|
if (answer && '+' == answer[0]) {
|
|
alarm(0);
|
|
if (ret)
|
|
*ret = answer;
|
|
else
|
|
free(answer);
|
|
return;
|
|
}
|
|
kill_helper();
|
|
bb_error_msg_and_die("%s failed", msg);
|
|
}
|
|
|
|
static void pop3_check(const char *fmt, const char *param)
|
|
{
|
|
pop3_checkr(fmt, param, NULL);
|
|
}
|
|
|
|
// strip argument of bad chars
|
|
static char *sane(char *str)
|
|
{
|
|
char *s = str;
|
|
char *p = s;
|
|
while (*s) {
|
|
if (isalnum(*s) || '_' == *s || '-' == *s || '.' == *s || '@' == *s) {
|
|
*p++ = *s;
|
|
}
|
|
s++;
|
|
}
|
|
*p = '\0';
|
|
return str;
|
|
}
|
|
|
|
static void pop3_message(int fd)
|
|
{
|
|
char *answer;
|
|
// read stdin, copy to file fd
|
|
while ((answer = xmalloc_fgets_str(stdin, "\r\n"))) {
|
|
char *s = answer;
|
|
if ('.' == answer[0]) {
|
|
if ('.' == answer[1])
|
|
s++;
|
|
else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3])
|
|
break;
|
|
}
|
|
xwrite(fd, s, strlen(s));
|
|
free(answer);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static const char *args[] = {
|
|
"openssl", "s_client", "-quiet", "-connect", NULL, "-tls1", "-starttls", "smtp", NULL
|
|
};
|
|
#define opt_connect args[4]
|
|
#define opt_after_connect args[5]
|
|
|
|
int sendgetmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int sendgetmail_main(int argc, char **argv)
|
|
{
|
|
llist_t *recipients = NULL;
|
|
char *from;
|
|
const char *subject;
|
|
char *charset = (char *)"utf-8";
|
|
|
|
const char *opt_user;
|
|
const char *opt_pass;
|
|
const char *opt_timeout;
|
|
const char *opt_chdir;
|
|
|
|
enum {
|
|
OPT_C = 1 << 0, // chdir
|
|
OPT_w = 1 << 1, // network timeout
|
|
OPT_U = 1 << 2, // user
|
|
OPT_P = 1 << 3, // password
|
|
OPT_X = 1 << 4, // use openssl connection helper
|
|
|
|
OPTS_t = 1 << 5, // sendmail "to"
|
|
OPTF_t = 1 << 5, // fetchmail "TOP"
|
|
|
|
OPTS_f = 1 << 6, // sendmail "from"
|
|
OPTF_z = 1 << 6, // fetchmail "delete"
|
|
|
|
OPTS_n = 1 << 7, // notification
|
|
OPTS_s = 1 << 8, // subject given
|
|
OPTS_c = 1 << 9, // charset for subject and body
|
|
};
|
|
|
|
const char *options;
|
|
unsigned opts;
|
|
|
|
// SENDMAIL
|
|
if ('s' == applet_name[0]) {
|
|
// save initial stdin
|
|
xdup2(STDIN_FILENO, INITIAL_STDIN_FILENO);
|
|
// -f must be specified
|
|
// -t may be multiple
|
|
opt_complementary = "-1:f:t::";
|
|
options = "C:w:U:P:X" "t:f:ns:c:";
|
|
// FETCHMAIL
|
|
} else {
|
|
opt_after_connect = NULL;
|
|
opt_complementary = "=1:P";
|
|
options = "C:w:U:P:X" "tz";
|
|
}
|
|
opts = getopt32(argv, options,
|
|
&opt_chdir, &opt_timeout, &opt_user, &opt_pass,
|
|
&recipients, &from, &subject, &charset
|
|
);
|
|
|
|
//argc -= optind;
|
|
argv += optind;
|
|
|
|
// first argument is remote server[:port]
|
|
opt_connect = *argv++;
|
|
|
|
if (opts & OPT_w)
|
|
timeout = xatou(opt_timeout);
|
|
|
|
// chdir
|
|
if (opts & OPT_C)
|
|
xchdir(opt_chdir);
|
|
|
|
// connect to server
|
|
if (opts & OPT_X) {
|
|
launch_helper(args);
|
|
} else {
|
|
// no connection helper provided -> make plain connect
|
|
int fd = create_and_connect_stream_or_die(opt_connect, 0);
|
|
xmove_fd(fd, STDIN_FILENO);
|
|
xdup2(STDIN_FILENO, STDOUT_FILENO);
|
|
}
|
|
|
|
// randomize
|
|
srand(time(NULL));
|
|
|
|
// SENDMAIL
|
|
if (recipients) {
|
|
int code;
|
|
char *boundary;
|
|
|
|
// wait for initial OK on plain connect
|
|
if (!(opts & OPT_X))
|
|
smtp_check(NULL, 220);
|
|
|
|
sane(from);
|
|
// introduce to server
|
|
// should we respect modern (but useless here) EHLO?
|
|
// or should they respect we wanna be tiny?!
|
|
if (!ENABLE_FEATURE_SENDMAIL_EHLO || 250 != smtp_checkp("EHLO %s", from, -1)) {
|
|
smtp_checkp("HELO %s", from, 250);
|
|
}
|
|
|
|
// set sender
|
|
// NOTE: if password has not been specified ->
|
|
// no authentication is possible
|
|
code = (opts & OPT_P) ? -1 : 250;
|
|
// first try softly without authentication
|
|
while (250 != smtp_checkp("MAIL FROM:<%s>", from, code)) {
|
|
// MAIL FROM failed -> authentication needed
|
|
// do we have username?
|
|
if (!(opts & OPT_U)) {
|
|
// no! fetch it from "from" option
|
|
//opts |= OPT_U;
|
|
opt_user = xstrdup(from);
|
|
*strchrnul(opt_user, '@') = '\0';
|
|
}
|
|
// now it seems we have username
|
|
// try to authenticate
|
|
if (334 == smtp_check("AUTH LOGIN", -1)) {
|
|
uuencode(NULL, opt_user);
|
|
smtp_check("", 334);
|
|
uuencode(NULL, opt_pass);
|
|
smtp_check("", 235);
|
|
}
|
|
// authenticated -> retry set sender
|
|
// but now die on failure
|
|
code = 250;
|
|
}
|
|
// set recipients
|
|
for (llist_t *to = recipients; to; to = to->link) {
|
|
smtp_checkp("RCPT TO:<%s>", sane(to->data), 250);
|
|
}
|
|
|
|
// now put message
|
|
smtp_check("DATA", 354);
|
|
// put address headers
|
|
printf("From: %s\r\n", from);
|
|
for (llist_t *to = recipients; to; to = to->link) {
|
|
printf("To: %s\r\n", to->data);
|
|
}
|
|
// put encoded subject
|
|
if (opts & OPTS_c)
|
|
sane(charset);
|
|
if (opts & OPTS_s) {
|
|
printf("Subject: =?%s?B?", charset);
|
|
uuencode(NULL, subject);
|
|
printf("?=\r\n");
|
|
}
|
|
// put notification
|
|
if (opts & OPTS_n)
|
|
printf("Disposition-Notification-To: %s\r\n", from);
|
|
// put common headers and body start
|
|
boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
|
|
printf(
|
|
USE_FEATURE_SENDMAIL_BLOATY("X-Mailer: busybox " BB_VER " sendmail\r\n")
|
|
"Message-ID: <%s>\r\n"
|
|
"Mime-Version: 1.0\r\n"
|
|
"%smultipart/mixed; boundary=\"%s\"\r\n"
|
|
, boundary
|
|
, "Content-Type: "
|
|
, boundary
|
|
);
|
|
// put body + attachment(s)
|
|
{
|
|
const char *fmt =
|
|
"\r\n--%s\r\n"
|
|
"%stext/plain; charset=%s\r\n"
|
|
"%s%s\r\n"
|
|
"%s"
|
|
;
|
|
const char *p = charset;
|
|
char *q = (char *)"";
|
|
while (argv[0]) {
|
|
printf(
|
|
fmt
|
|
, boundary
|
|
, "Content-Type: "
|
|
, p
|
|
, "Content-Disposition: inline"
|
|
, q
|
|
, "Content-Transfer-Encoding: base64\r\n"
|
|
);
|
|
p = "";
|
|
fmt =
|
|
"\r\n--%s\r\n"
|
|
"%sapplication/octet-stream%s\r\n"
|
|
"%s; filename=\"%s\"\r\n"
|
|
"%s"
|
|
;
|
|
uuencode(*argv, NULL);
|
|
if (*(++argv))
|
|
q = bb_get_last_path_component_strip(argv[0]);
|
|
}
|
|
}
|
|
// put terminator
|
|
printf("\r\n--%s--\r\n" "\r\n", boundary);
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
free(boundary);
|
|
|
|
// end message and say goodbye
|
|
smtp_check(".", 250);
|
|
smtp_check("QUIT", 221);
|
|
|
|
// FETCHMAIL
|
|
} else {
|
|
// authenticate
|
|
char *buf;
|
|
unsigned nmsg;
|
|
if (!(opts & OPT_U)) {
|
|
//opts |= OPT_U;
|
|
opt_user = getenv("USER");
|
|
}
|
|
#if ENABLE_FEATURE_FETCHMAIL_APOP
|
|
pop3_checkr(NULL, NULL, &buf);
|
|
// server supports APOP?
|
|
if ('<' == buf[4]) {
|
|
md5_ctx_t md5;
|
|
uint8_t hex[16*2 + 1];
|
|
// yes. compose <stamp><password>
|
|
char *s = strchr(buf, '>');
|
|
if (s)
|
|
strcpy(s+1, opt_pass);
|
|
s = buf+4;
|
|
// get md5 sum of <stamp><password>
|
|
md5_begin(&md5);
|
|
md5_hash(s, strlen(s), &md5);
|
|
md5_end(s, &md5);
|
|
bin2hex(hex, s, 16);
|
|
// APOP
|
|
s = xasprintf("%s %s", opt_user, hex);
|
|
pop3_check("APOP %s", s);
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
free(s);
|
|
free(buf);
|
|
}
|
|
} else {
|
|
#else
|
|
{
|
|
pop3_check(NULL, NULL);
|
|
#endif
|
|
// USER
|
|
pop3_check("USER %s", opt_user);
|
|
// PASS
|
|
pop3_check("PASS %s", opt_pass);
|
|
}
|
|
|
|
// get statistics
|
|
pop3_checkr("STAT", NULL, &buf);
|
|
|
|
// get number of messages
|
|
nmsg = atoi(buf+4);
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
free(buf);
|
|
|
|
// lock maildir
|
|
////USE_FEATURE_CLEAN_UP(close)(xopen(".lock", O_CREAT | O_WRONLY | O_TRUNC | O_EXCL));
|
|
|
|
// make tempnam(dir, salt) respect dir argument
|
|
unsetenv("TMPDIR");
|
|
|
|
// TODO: piping through external filter argv... if *argv
|
|
|
|
// cache fetch command
|
|
{
|
|
const char *retr = (opts & OPTF_t) ? "TOP %u 0" : "RETR %u";
|
|
// loop through messages
|
|
for (; nmsg; nmsg--) {
|
|
int fd;
|
|
char tmp_name[sizeof("tmp/XXXXXX")];
|
|
char new_name[sizeof("new/XXXXXX")];
|
|
|
|
// retrieve message in ./tmp
|
|
strcpy(tmp_name, "tmp/XXXXXX");
|
|
fd = mkstemp(tmp_name);
|
|
if (fd < 0)
|
|
bb_perror_msg_and_die("cannot create unique file");
|
|
pop3_check(retr, (const char *)nmsg);
|
|
pop3_message(fd); // NB: closes fd
|
|
|
|
// move file to ./new atomically
|
|
strncpy(new_name, "new", 3);
|
|
strcpy(new_name + 3, tmp_name + 3);
|
|
if (rename(tmp_name, new_name) < 0) {
|
|
// rats! such file exists! try to make unique name
|
|
strcpy(new_name + 3, "tmp/XXXXXX" + 3);
|
|
fd = mkstemp(new_name);
|
|
if (fd < 0)
|
|
bb_perror_msg_and_die("cannot create unique file");
|
|
close(fd);
|
|
if (rename(tmp_name, new_name) < 0) {
|
|
// something is very wrong
|
|
bb_perror_msg_and_die("cannot move %s to %s", tmp_name, new_name);
|
|
}
|
|
}
|
|
|
|
// delete message from server
|
|
if (opts & OPTF_z)
|
|
pop3_check("DELE %u", (const char*)nmsg);
|
|
}
|
|
}
|
|
|
|
// Bye
|
|
pop3_check("QUIT", NULL);
|
|
|
|
// unlock maildir
|
|
////unlink(".lock");
|
|
}
|
|
|
|
return 0;
|
|
}
|