/* vi: set sw=4 ts=4: */
/*
- * bare bones sendmail
+ * bare bones sendmail/fetchmail
*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
*/
#include "libbb.h"
-/*
- Extracted from BB uuencode.c
- */
-enum {
- SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */
- DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
-};
+#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 = xopen(fname, O_RDONLY);
+ fd = INITIAL_STDIN_FILENO;
+ if (NOT_LONE_DASH(fname))
+ fd = xopen(fname, O_RDONLY);
src_buf = bb_common_bufsiz1;
} else {
len = strlen(text);
}
if (!size)
break;
- // Encode the buffer we just read in
+ // encode the buffer we just read in
bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
if (fname) {
- xwrite(STDOUT_FILENO, "\n", 1);
+ xwrite(STDOUT_FILENO, "\r\n", 2);
} else {
src_buf += size;
len -= size;
}
xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
}
- if (ENABLE_FEATURE_CLEAN_UP && fname)
+ if (fname)
close(fd);
}
-#if ENABLE_FEATURE_SENDMAIL_NETWORK
+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)
+ 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 pid_t helper_pid;
-
-// read stdin, parses first bytes to a number, i.e. server response
-// if code = -1 then just return this number
-// if code != -1 then checks whether the number equals the code
-// if not equal -> die saying errmsg
-static int check(int code, const char *errmsg)
+static void launch_helper(const char **argv)
{
- char *answer;
+ // 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
+ sig_catch(SIGCHLD, signal_handler);
+ sig_catch(SIGALRM, signal_handler);
+ signal_handler(SIGCHLD);
+ // child seems OK -> parent goes on
+}
+
+static unsigned timeout;
- // read a string and match it against the set of available answers
+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);
- if (-1 == code || n == code) {
+ alarm(0);
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(msg);
free(answer);
+ }
+ if (-1 == code || n == code) {
return n;
}
}
- // TODO: is there more elegant way to terminate child on program failure?
- if (helper_pid > 0)
- kill(helper_pid, SIGTERM);
- if (!answer)
- answer = (char*)"EOF";
- else
- *strchrnul(answer, '\r') = '\0';
- bb_error_msg_and_die("error at %s: got '%s' instead", errmsg, answer);
+ kill_helper();
+ bb_error_msg_and_die("%s failed", msg);
}
-static int puts_and_check(const char *msg, int code, const char *errmsg)
+static int smtp_check(const char *fmt, int code)
{
- printf("%s\r\n", msg);
- return check(code, errmsg);
+ 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
*p = '\0';
return str;
}
-#endif
-int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int sendmail_main(int argc, char **argv)
+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;
- llist_t *bodies = NULL;
- llist_t *attachments = NULL;
char *from;
- char *notify = NULL;
const char *subject;
- char *charset = (char*)"utf-8";
-#if ENABLE_FEATURE_SENDMAIL_NETWORK
- const char *wsecs = "10";
- const char *server = "127.0.0.1";
- const char *port = NULL;
+ char *charset = (char *)"utf-8";
+
const char *opt_user;
const char *opt_pass;
- unsigned timeout;
-#endif
- char *boundary;
- unsigned opts;
+ const char *opt_timeout;
+ const char *opt_chdir;
+
enum {
- OPT_f = 1 << 0, // sender
- OPT_n = 1 << 2, // notification
- OPT_s = 1 << 3, // subject given
- OPT_c = 1 << 6, // charset
- OPT_d = 1 << 7, // dry run - no networking
- OPT_w = 1 << 8, // network timeout
- OPT_h = 1 << 9, // server
- OPT_p = 1 << 10, // port
- OPT_U = 1 << 11, // user specified
- OPT_P = 1 << 12, // password specified
+ 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
};
- // -f must be specified
- // -t, -b, -a may be multiple
- opt_complementary = "f:t::b::a::";
- opts = getopt32(argv,
- "f:t:n::s:b:a:c:" USE_FEATURE_SENDMAIL_NETWORK("dw:h:p:U:P:"),
- &from, &recipients, ¬ify, &subject, &bodies, &attachments, &charset
- USE_FEATURE_SENDMAIL_NETWORK(, &wsecs, &server, &port, &opt_user, &opt_pass)
+ 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;
- // sanitize user input
- sane(from);
- if (opts & OPT_c)
- sane(charset);
-
- // establish connection
-#if ENABLE_FEATURE_SENDMAIL_NETWORK
- timeout = xatou(wsecs);
- if (!(opts & OPT_d)) {
- // ask password if we need to and while we're still have terminal
- // TODO: get password directly from /dev/tty? or from a secret file?
- if ((opts & (OPT_U+OPT_P)) == OPT_U) {
- if (!isatty(STDIN_FILENO) || !(opt_pass = bb_askpass(0, "Password: "))) {
- bb_error_msg_and_die("no password");
- }
+ // 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 chat timeout
- alarm(timeout);
- // connect to server
- if (argv[0]) {
- // if connection helper given
- // 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]);
- // replace child with connection helper
- if (!helper_pid) {
- // child - try to execute connection helper
- BB_EXECVP(argv[0], argv);
- _exit(127);
+
+ // 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';
}
- // parent - check whether child is alive
- sig_catch(SIGCHLD, signal_handler);
- sig_catch(SIGALRM, signal_handler);
- signal_handler(SIGCHLD);
- // child seems OK -> parent goes on SMTP chat
- } else {
- // no connection helper provided -> make plain connect
- int fd = create_and_connect_stream_or_die(
- server,
- bb_lookup_port(port, "tcp", 25)
- );
- xmove_fd(fd, STDIN_FILENO);
- xdup2(STDIN_FILENO, STDOUT_FILENO);
- // wait for OK
- check(220, "INIT");
+ // 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;
}
- // mail user specified? try modern AUTHentication
- if ((opts & OPT_U)
- && (334 == puts_and_check("auth login", -1, "auth login"))
- ) {
- uuencode(NULL, opt_user);
- puts_and_check("", 334, "AUTH");
- uuencode(NULL, opt_pass);
- puts_and_check("", 235, "AUTH");
- // no mail user specified or modern AUTHentication is not supported?
- } else {
- // fallback to simple HELO authentication
- // fetch domain name (defaults to local)
- const char *domain = strchr(from, '@');
- if (domain)
- domain++;
- else
- domain = "local";
- printf("helo %s\r\n", domain);
- check(250, "HELO");
+ // set recipients
+ for (llist_t *to = recipients; to; to = to->link) {
+ smtp_checkp("RCPT TO:<%s>", sane(to->data), 250);
}
- // set addresses
- printf("mail from:<%s>\r\n", from);
- check(250, "MAIL FROM");
+ // 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("rcpt to:<%s>\r\n", sane(to->data));
- check(250, "RCPT TO");
+ printf("To: %s\r\n", to->data);
}
- puts_and_check("data", 354, "DATA");
- // no timeout while sending message
- alarm(0);
- }
-#endif
-
- // now put message
- // put address headers
- printf("From: %s\r\n", from);
- for (llist_t *to = recipients; to; to = to->link) {
- printf("To: %s\r\n", sane(to->data));
- }
- // put encoded subject
- if (opts & OPT_s) {
- printf("Subject: =?%s?B?", charset);
- uuencode(NULL, subject);
- puts("?=\r");
- }
- // put notification
- if (opts & OPT_n) {
- // -n without parameter?
- if (!notify)
- notify = from; // notify sender by default
- printf("Disposition-Notification-To: %s\r\n", sane(notify));
- }
- // put common headers and body start
- //srand(?);
- boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
- printf(
- "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"
- "\r\n"
- "--%s\r\n"
- "%stext/plain; charset=%s\r\n"
- "%s\r\n%s"
- , boundary
- , "Content-Type: "
- , boundary, boundary
- , "Content-Type: "
- , charset
- , "Content-Disposition: inline"
- , "Content-Transfer-Encoding: base64\r\n"
- );
- // put body(ies)
- for (llist_t *f = bodies; f; f = f->link) {
- uuencode(f->data, NULL);
- }
- // put attachment(s)
- for (llist_t *f = attachments; f; f = f->link) {
+ // 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(
- "\r\n--%s\r\n"
- "%sapplication/octet-stream\r\n"
- "%s; filename=\"%s\"\r\n"
- "%s"
+ 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: "
- , "Content-Disposition: inline"
- , bb_get_last_path_component_strip(f->data)
- , "Content-Transfer-Encoding: base64\r\n"
+ , boundary
);
- uuencode(f->data, NULL);
- }
- // put terminator
- printf("\r\n--%s--\r\n\r\n", boundary);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(boundary);
-
-#if ENABLE_FEATURE_SENDMAIL_NETWORK
- // end message and say goodbye
- if (!(opts & OPT_d)) {
- alarm(timeout);
- puts_and_check(".", 250, "BODY");
- puts_and_check("quit", 221, "QUIT");
+ // 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 thru external filter argv... if *argv
+
+ // cache fetch command
+ {
+ const char *retr = (opts & OPTF_t) ? "TOP %u 0" : "RETR %u";
+ // loop thru 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;
}
projects / oweals / busybox.git / commitdiff