sendmail: yet another maintainer's update
This commit is contained in:
Denis Vlasenko
parent
17db1a9ac1
commit
8195d20e36
@ -1035,10 +1035,8 @@ USE_FEATURE_BRCTL_FANCY("\n" \
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" -P password Authenticate with specified password\n" \
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" -X Use openssl connection helper for secured servers\n" \
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" -t Get only headers\n" \
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" -z Delete messages on server" \
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USE_FEATURE_FETCHMAIL_FILTER("\n" \
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" prog Run prog <message file> on message delivery" \
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)
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" -z Delete messages on server\n" \
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" prog Run prog <message file> on message delivery"
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#define findfs_trivial_usage \
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"LABEL=label or UUID=uuid"
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@ -678,39 +678,11 @@ config SENDMAIL
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help
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Barebones sendmail.
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config FEATURE_SENDMAIL_EHLO
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bool "Support EHLO command"
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default n
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depends on SENDMAIL
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help
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Support ESMTP EHLO command.
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config FEATURE_SENDMAIL_BLOATY
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bool "Be more verbose"
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default n
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depends on SENDMAIL
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help
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Should be turned off.
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config FETCHMAIL
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bool "fetchmail"
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default n
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help
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Barebone fetchmail.
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config FEATURE_FETCHMAIL_APOP
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bool "Support APOP authentication"
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default y
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depends on FETCHMAIL
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help
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Support secure APOP authentication.
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config FEATURE_FETCHMAIL_FILTER
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bool "Pipe through external filter"
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default n
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depends on FETCHMAIL
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help
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Support piping incoming messages through external filter.
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Barebones fetchmail.
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config SLATTACH
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bool "slattach"
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@ -63,20 +63,13 @@ static void uuencode(char *fname, const char *text)
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close(fd);
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}
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static const char *const init_xargs[9] = {
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"openssl", "s_client", "-quiet", "-connect",
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NULL, "-tls1", "-starttls", "smtp"
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};
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struct globals {
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pid_t helper_pid;
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unsigned timeout;
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// arguments for SSL connection helper
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const char *xargs[9];
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#if ENABLE_FEATURE_FETCHMAIL_FILTER
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// arguments for postprocess helper
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const char *fargs[3];
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#endif
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};
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#define G (*ptr_to_globals)
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#define helper_pid (G.helper_pid)
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@ -85,16 +78,21 @@ struct globals {
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#define fargs (G.fargs )
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#define INIT_G() do { \
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PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
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memcpy(xargs, init_xargs, sizeof(init_xargs)); \
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xargs[0] = "openssl"; \
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xargs[1] = "s_client"; \
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xargs[2] = "-quiet"; \
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xargs[3] = "-connect"; \
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/*xargs[4] = "server[:port]";*/ \
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xargs[5] = "-tls1"; \
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xargs[6] = "-starttls"; \
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xargs[7] = "smtp"; \
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fargs[0] = "utf-8"; \
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} while (0)
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#define opt_connect (xargs[4])
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#define opt_after_connect (xargs[5])
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#if ENABLE_FEATURE_FETCHMAIL_FILTER
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#define opt_charset (fargs[0])
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#define opt_subject (fargs[1])
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#endif
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static void kill_helper(void)
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{
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@ -116,11 +114,7 @@ static void signal_handler(int signo)
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// SIGCHLD. reap zombies
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if (wait_any_nohang(&err) > 0)
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if (WIFEXITED(err) && WEXITSTATUS(err))
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#if ENABLE_FEATURE_SENDMAIL_BLOATY
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bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err));
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#else
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bb_error_msg_and_die("child failed");
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#endif
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}
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static void launch_helper(const char **argv)
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@ -141,12 +135,11 @@ static void launch_helper(const char **argv)
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if (pipes[i] > STDOUT_FILENO)
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close(pipes[i]);
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if (!helper_pid) {
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// child - try to execute connection helper
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// close(STDERR_FILENO);
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// child: try to execute connection helper
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BB_EXECVP(*argv, (char **)argv);
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_exit(127);
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}
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// parent - check whether child is alive
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// parent: check whether child is alive
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bb_signals(0
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+ (1 << SIGCHLD)
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+ (1 << SIGALRM)
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@ -155,13 +148,12 @@ static void launch_helper(const char **argv)
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// child seems OK -> parent goes on
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}
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static char *command(const char *fmt, const char *param)
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static const char *command(const char *fmt, const char *param)
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{
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char *msg = (char *)fmt;
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const char *msg = fmt;
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alarm(timeout);
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if (msg) {
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// if (param)
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msg = xasprintf(fmt, param);
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msg = xasprintf(fmt, param);
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printf("%s\r\n", msg);
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}
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fflush(stdout);
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@ -171,25 +163,20 @@ static char *command(const char *fmt, const char *param)
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static int smtp_checkp(const char *fmt, const char *param, int code)
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{
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char *answer;
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char *msg = command(fmt, param);
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const char *msg = command(fmt, param);
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// read stdin
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// if the string has a form \d\d\d- -- read next string. E.g. EHLO response
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// parse first bytes to a number
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// if code = -1 then just return this number
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// if code != -1 then checks whether the number equals the code
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// if not equal -> die saying msg
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#if ENABLE_FEATURE_SENDMAIL_EHLO
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while ((answer = xmalloc_getline(stdin)) != NULL)
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if (strlen(answer) <= 3 || '-' != answer[3])
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break;
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#else
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answer = xmalloc_getline(stdin);
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#endif
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if (answer) {
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int n = atoi(answer);
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alarm(0);
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(msg);
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free(answer);
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}
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if (-1 == code || n == code) {
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@ -200,7 +187,7 @@ static int smtp_checkp(const char *fmt, const char *param, int code)
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bb_error_msg_and_die("%s failed", msg);
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}
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static int smtp_check(const char *fmt, int code)
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static int inline smtp_check(const char *fmt, int code)
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{
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return smtp_checkp(fmt, NULL, code);
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}
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@ -223,7 +210,7 @@ static char *sane(char *str)
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#if ENABLE_FETCHMAIL
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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 = command(fmt, param);
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const char *msg = command(fmt, param);
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char *answer = xmalloc_getline(stdin);
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if (answer && '+' == *answer) {
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alarm(0);
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@ -237,7 +224,7 @@ static void pop3_checkr(const char *fmt, const char *param, char **ret)
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bb_error_msg_and_die("%s failed", msg);
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}
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static void pop3_check(const char *fmt, const char *param)
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static void inline 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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@ -249,7 +236,7 @@ static void pop3_message(const char *filename)
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// create and open file filename
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// read stdin, copy to created file
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fd = xopen(filename, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL);
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while ((answer = xmalloc_fgets_str(stdin, "\r\n"))) {
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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) {
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if ('.' == answer[1])
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@ -268,10 +255,6 @@ int sendgetmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sendgetmail_main(int argc, char **argv)
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{
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llist_t *opt_recipients = NULL;
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#if !ENABLE_FEATURE_FETCHMAIL_FILTER
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char *opt_subject;
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char *opt_charset = (char *)"utf-8";
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#endif
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const char *opt_user;
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const char *opt_pass;
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@ -295,8 +278,12 @@ int sendgetmail_main(int argc, char **argv)
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const char *options;
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unsigned opts;
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// init global variables
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INIT_G();
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// parse options, different option sets for sendmail and fetchmail
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// N.B. opt_after_connect hereafter is NULL if we are called as fetchmail
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// and is NOT NULL if we are called as sendmail
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if (!ENABLE_FETCHMAIL || 's' == applet_name[0]) {
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// SENDMAIL
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// save initial stdin (body or attachements can be piped!)
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@ -313,7 +300,6 @@ int sendgetmail_main(int argc, char **argv)
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&timeout, &opt_user, &opt_pass,
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&opt_subject, &opt_charset, &opt_recipients
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);
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//argc -= optind;
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argv += optind;
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@ -321,20 +307,29 @@ int sendgetmail_main(int argc, char **argv)
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opt_connect = *argv++;
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// connect to server
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// SSL ordered? ->
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if (opts & OPT_X) {
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// ... use openssl helper
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launch_helper(xargs);
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// no SSL ordered? ->
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} else {
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// no connection helper provided -> make plain connect
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int fd = create_and_connect_stream_or_die(opt_connect, 0);
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// ... make plain connect
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int fd = create_and_connect_stream_or_die(opt_connect, 25);
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// make ourselves a simple IO filter
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// from now we know nothing about network :)
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xmove_fd(fd, STDIN_FILENO);
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xdup2(STDIN_FILENO, STDOUT_FILENO);
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}
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#if ENABLE_FETCHMAIL
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// we are sendmail?
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if (opt_after_connect)
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#endif
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{
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// SENDMAIL
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/***************************************************
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* SENDMAIL
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***************************************************/
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char *opt_from;
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int code;
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char *boundary;
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@ -342,44 +337,45 @@ int sendgetmail_main(int argc, char **argv)
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const char *p;
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char *q;
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// wait for initial OK on plain connect
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if (!(opts & OPT_X))
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// we didn't use SSL helper? ->
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if (!(opts & OPT_X)) {
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// ... wait for initial server OK
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smtp_check(NULL, 220);
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}
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// get specified sender
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// get the sender
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opt_from = sane(*argv++);
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// introduce to server
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// should we respect modern (but useless here) EHLO?
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// or should they respect we wanna be tiny?!
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if (!ENABLE_FEATURE_SENDMAIL_EHLO || 250 != smtp_checkp("EHLO %s", opt_from, -1)) {
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// we should start with modern EHLO
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if (250 != smtp_checkp("EHLO %s", opt_from, -1)) {
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smtp_checkp("HELO %s", opt_from, 250);
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}
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// set sender
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// NOTE: if password has not been specified ->
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// no authentication is possible
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// NOTE: if password has not been specified
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// then no authentication is possible
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code = (opts & OPT_P) ? -1 : 250;
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// first try softly without authentication
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while (250 != smtp_checkp("MAIL FROM:<%s>", opt_from, code)) {
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// MAIL FROM failed -> authentication needed
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// do we have username?
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// have we got username?
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if (!(opts & OPT_U)) {
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// no! fetch it from "from" option
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//opts |= OPT_U;
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opt_user = xstrdup(opt_from);
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*strchrnul(opt_user, '@') = '\0';
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}
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// now it seems we have username
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// try to authenticate
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// now we've got username
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// so try to authenticate
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if (334 == smtp_check("AUTH LOGIN", -1)) {
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uuencode(NULL, opt_user);
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smtp_check("", 334);
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uuencode(NULL, opt_pass);
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smtp_check("", 235);
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}
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// authenticated -> retry set sender
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// but now die on failure
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// authenticated OK? -> retry to set sender
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// but this time die on failure!
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code = 250;
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}
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@ -388,13 +384,15 @@ int sendgetmail_main(int argc, char **argv)
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smtp_checkp("RCPT TO:<%s>", sane(to->data), 250);
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}
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// now put message
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// enter "put message" mode
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smtp_check("DATA", 354);
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// put address headers
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printf("From: %s\r\n", opt_from);
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for (llist_t *to = opt_recipients; to; to = to->link) {
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printf("To: %s\r\n", to->data);
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}
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// put encoded subject
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if (opts & OPTS_c)
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sane((char *)opt_charset);
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@ -403,17 +401,17 @@ int sendgetmail_main(int argc, char **argv)
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uuencode(NULL, opt_subject);
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printf("?=\r\n");
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}
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// put notification
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if (opts & OPTS_n)
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printf("Disposition-Notification-To: %s\r\n", opt_from);
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// make a random string -- it will delimit message parts
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srand(monotonic_us());
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boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
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// put common headers and body start
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// randomize
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#if ENABLE_FEATURE_SENDMAIL_BLOATY
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srand(time(NULL));
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#endif
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boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
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printf(
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USE_FEATURE_SENDMAIL_BLOATY("X-Mailer: busybox " BB_VER " sendmail\r\n")
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"Message-ID: <%s>\r\n"
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"Mime-Version: 1.0\r\n"
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"%smultipart/mixed; boundary=\"%s\"\r\n"
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@ -421,8 +419,10 @@ int sendgetmail_main(int argc, char **argv)
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, "Content-Type: "
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, boundary
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);
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// put body + attachment(s)
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// put body + attachment(s)
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// N.B. all these weird things just to be tiny
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// by reusing string patterns!
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fmt =
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"\r\n--%s\r\n"
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"%stext/plain; charset=%s\r\n"
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@ -453,44 +453,50 @@ int sendgetmail_main(int argc, char **argv)
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q = bb_get_last_path_component_strip(*argv);
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}
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// put terminator
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// put message terminator
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printf("\r\n--%s--\r\n" "\r\n", boundary);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(boundary);
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// end message and say goodbye
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smtp_check(".", 250);
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// leave "put message" mode
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smtp_check(".", 250);
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// ... and say goodbye
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smtp_check("QUIT", 221);
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#if ENABLE_FETCHMAIL
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} else {
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// FETCHMAIL
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/***************************************************
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* FETCHMAIL
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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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// cache fetch command
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// cache fetch command:
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// TOP will return only the headers
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// RETR will dump the whole message
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const char *retr = (opts & OPTF_t) ? "TOP %u 0" : "RETR %u";
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// goto maildir
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xchdir(*argv++);
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#if ENABLE_FEATURE_FETCHMAIL_FILTER
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// cache postprocess program
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*fargs = *argv;
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#endif
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// authenticate
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if (!(opts & OPT_U)) {
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//opts |= OPT_U;
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opt_user = getenv("USER");
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// N.B. IMHO getenv("USER") can be way easily spoofed!
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opt_user = bb_getpwuid(NULL, -1, getuid());
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}
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#if ENABLE_FEATURE_FETCHMAIL_APOP
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// get server greeting
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pop3_checkr(NULL, NULL, &buf);
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// server supports APOP?
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if ('<' == *buf) {
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md5_ctx_t md5;
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// yes. compose <stamp><password>
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// yes! compose <stamp><password>
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char *s = strchr(buf, '>');
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if (s)
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strcpy(s+1, opt_pass);
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@ -512,26 +518,22 @@ int sendgetmail_main(int argc, char **argv)
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free(s);
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free(buf-4); // buf is "+OK " away from malloc'ed string
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}
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// server ignores APOP -> use simple text authentication
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} else {
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#else
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{
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pop3_check(NULL, NULL);
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#endif
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// USER
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pop3_check("USER %s", opt_user);
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// PASS
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pop3_check("PASS %s", opt_pass);
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}
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// get statistics
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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 = xzalloc(MAXHOSTNAMELEN+1);
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gethostname(hostname, MAXHOSTNAMELEN);
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hostname = safe_gethostname();
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pid = getpid();
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|
||||
// get number of messages
|
||||
// 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
|
||||
@ -542,19 +544,19 @@ int sendgetmail_main(int argc, char **argv)
|
||||
|
||||
// loop through messages
|
||||
for (; nmsg; nmsg--) {
|
||||
|
||||
// generate unique filename
|
||||
char *filename = xasprintf("tmp/%llu.%u.%s", monotonic_us(), pid, hostname);
|
||||
char *target;
|
||||
#if ENABLE_FEATURE_FETCHMAIL_FILTER
|
||||
int rc;
|
||||
#endif
|
||||
// retrieve message in ./tmp
|
||||
int rc;
|
||||
|
||||
// retrieve message in ./tmp/
|
||||
pop3_check(retr, (const char *)nmsg);
|
||||
pop3_message(filename);
|
||||
// delete message from server
|
||||
if (opts & OPTF_z)
|
||||
pop3_check("DELE %u", (const char*)nmsg);
|
||||
|
||||
#if ENABLE_FEATURE_FETCHMAIL_FILTER
|
||||
// run postprocessing program
|
||||
if (*fargs) {
|
||||
fargs[1] = filename;
|
||||
@ -564,23 +566,18 @@ int sendgetmail_main(int argc, char **argv)
|
||||
if (1 == rc)
|
||||
goto skip;
|
||||
}
|
||||
#endif
|
||||
// atomically move message to ./new
|
||||
|
||||
// atomically move message to ./new/
|
||||
target = xstrdup(filename);
|
||||
strncpy(target, "new", 3);
|
||||
// ... or just stop receiving on error
|
||||
if (rename_or_warn(filename, target))
|
||||
break;
|
||||
free(target);
|
||||
#if ENABLE_FEATURE_FETCHMAIL_FILTER
|
||||
skip:
|
||||
#endif
|
||||
free(filename);
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_CLEAN_UP)
|
||||
free(hostname);
|
||||
|
||||
// Bye
|
||||
pop3_check("QUIT", NULL);
|
||||
#endif // ENABLE_FETCHMAIL
|
||||
|
||||
Loading…
Reference in New Issue
Block a user