int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sendmail_main(int argc UNUSED_PARAM, char **argv)
{
-#if ENABLE_FEATURE_SENDMAIL_MAILX
- llist_t *opt_attachments = NULL;
- const char *opt_subject;
-#if ENABLE_FEATURE_SENDMAIL_MAILXX
- llist_t *opt_carboncopies = NULL;
- char *opt_errors_to;
-#endif
-#endif
char *opt_connect = opt_connect;
- char *opt_from, *opt_fullname;
- char *boundary;
- llist_t *l;
- llist_t *headers = NULL;
+ char *opt_from;
+ char *s;
+ llist_t *list = NULL;
char *domain = sane_address(safe_getdomainname());
int code;
enum {
- OPT_w = 1 << 0, // network timeout
- OPT_t = 1 << 1, // read message for recipients
- OPT_N = 1 << 2, // request notification
- OPT_f = 1 << 3, // sender address
- OPT_F = 1 << 4, // sender name, overrides $NAME
- OPT_s = 1 << 5, // subject
- OPT_j = 1 << 6, // assumed charset
- OPT_a = 1 << 7, // attachment(s)
- OPT_H = 1 << 8, // use external connection helper
- OPT_S = 1 << 9, // specify connection string
- OPT_c = 1 << 10, // carbon copy
- OPT_e = 1 << 11, // errors-to address
+ //--- standard options
+ OPT_t = 1 << 0, // read message for recipients, append them to those on cmdline
+ OPT_f = 1 << 1, // sender address
+ OPT_o = 1 << 2, // various options. -oi IMPLIED! others are IGNORED!
+ //--- BB specific options
+ OPT_w = 1 << 3, // network timeout
+ OPT_H = 1 << 4, // use external connection helper
+ OPT_S = 1 << 5, // specify connection string
+ OPT_a = 1 << 6, // authentication tokens
};
// init global variables
G.fp0 = fdopen(3, "r");
// parse options
- opt_complementary = "w+" USE_FEATURE_SENDMAIL_MAILX(":a::H--S:S--H") USE_FEATURE_SENDMAIL_MAILXX(":c::");
- opts = getopt32(argv,
- "w:t" "N:f:F:" USE_FEATURE_SENDMAIL_MAILX("s:j:a:H:S:") USE_FEATURE_SENDMAIL_MAILXX("c:e:")
- "X:V:vq:R:O:o:nmL:Iih:GC:B:b:A:" // postfix compat only, ignored
- // r:Q:p:M:Dd are candidates from another man page. TODO?
- "46E", // ssmtp introduces another quirks. TODO?: -a[upm] (user, pass, method) to be supported
- &timeout /* -w */, NULL, &opt_from, &opt_fullname,
- USE_FEATURE_SENDMAIL_MAILX(&opt_subject, &G.opt_charset, &opt_attachments, &opt_connect, &opt_connect,)
- USE_FEATURE_SENDMAIL_MAILXX(&opt_carboncopies, &opt_errors_to,)
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
- );
+ // -f is required. -H and -S are mutually exclusive
+ opt_complementary = "f:w+:H--S:S--H:a::";
+ // N.B. since -H and -S are mutually exclusive they do not interfere in opt_connect
+ // -a is for ssmtp (http://downloads.openwrt.org/people/nico/man/man8/ssmtp.8.html) compatibility,
+ // it is still under development.
+ opts = getopt32(argv, "tf:o:w:H:S:a::", &opt_from, NULL, &timeout, &opt_connect, &opt_connect, &list);
//argc -= optind;
argv += optind;
+ // process -a[upm]<token> options
+ if ((opts & OPT_a) && !list)
+ bb_show_usage();
+ while (list) {
+ char *a = (char *) llist_pop(&list);
+ if ('u' == a[0])
+ G.user = xstrdup(a+1);
+ if ('p' == a[0])
+ G.pass = xstrdup(a+1);
+ // N.B. we support only AUTH LOGIN so far
+ //if ('m' == a[0])
+ // G.method = xstrdup(a+1);
+ }
+ // N.B. list == NULL here
+ //bb_info_msg("OPT[%x] AU[%s], AP[%s], AM[%s], ARGV[%s]", opts, au, ap, am, *argv);
+
// connect to server
-#if ENABLE_FEATURE_SENDMAIL_MAILX
- // N.B. -H and -S are mutually exclusive so they do not spoil opt_connect
// connection helper ordered? ->
if (opts & OPT_H) {
const char *args[] = { "sh", "-c", opt_connect, NULL };
// plug it in
launch_helper(args);
// vanilla connection
- } else
-#endif
- {
+ } else {
int fd;
- // host[:port] not explicitly specified ? -> use $SMTPHOST
+ // host[:port] not explicitly specified? -> use $SMTPHOST
// no $SMTPHOST ? -> use localhost
if (!(opts & OPT_S)) {
opt_connect = getenv("SMTPHOST");
// wait for initial server OK
// N.B. if we used openssl the initial 220 answer is already swallowed during openssl TLS init procedure
- // so we need to push the server to see whether we are ok
+ // so we need to kick the server to see whether we are ok
code = smtp_check("NOOP", -1);
// 220 on plain connection, 250 on openssl-helped TLS session
if (220 == code)
if (250 != smtp_checkp("EHLO %s", domain, -1)) {
smtp_checkp("HELO %s", domain, 250);
}
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(domain);
+
+ // perform authentication
+ if (opts & OPT_a) {
+ smtp_check("AUTH LOGIN", 334);
+ // we must read credentials unless they are given via -a[up] options
+ if (!G.user || !G.pass)
+ get_cred_or_die(4);
+ encode_base64(NULL, G.user, NULL);
+ smtp_check("", 334);
+ encode_base64(NULL, G.pass, NULL);
+ smtp_check("", 235);
+ }
// set sender
// N.B. we have here a very loosely defined algotythm
// file descriptor (e.g. 4), or again from a secured file.
// got no sender address? -> use system username as a resort
- if (!(opts & OPT_f)) {
- // N.B. IMHO getenv("USER") can be way easily spoofed!
- G.user = xuid2uname(getuid());
- opt_from = xasprintf("%s@%s", G.user, domain);
- }
- if (ENABLE_FEATURE_CLEAN_UP)
- free(domain);
-
- code = -1; // first try softly without authentication
- while (250 != smtp_checkp("MAIL FROM:<%s>", opt_from, code)) {
- // MAIL FROM failed -> authentication needed
- if (334 == smtp_check("AUTH LOGIN", -1)) {
- // we must read credentials
- get_cred_or_die(4);
- encode_base64(NULL, G.user, NULL);
- smtp_check("", 334);
- encode_base64(NULL, G.pass, NULL);
- smtp_check("", 235);
- }
- // authenticated OK? -> retry to set sender
- // but this time die on failure!
- code = 250;
- }
-
- // recipients specified as arguments
- while (*argv) {
- char *s = sane_address(*argv);
- // loose test on email address validity
-// if (strchr(s, '@')) {
- rcptto(s);
- llist_add_to_end(&headers, xasprintf("To: %s", s));
-// }
- argv++;
- }
-
-#if ENABLE_FEATURE_SENDMAIL_MAILXX
- // carbon copies recipients specified as -c options
- for (l = opt_carboncopies; l; l = l->link) {
- char *s = sane_address(l->data);
- // loose test on email address validity
-// if (strchr(s, '@')) {
- rcptto(s);
- // TODO: do we ever need to mangle the message?
- //llist_add_to_end(&headers, xasprintf("Cc: %s", s));
-// }
- }
-#endif
-
- // if -t specified or no recipients specified -> read recipients from message
- // i.e. scan stdin for To:, Cc:, Bcc: lines ...
- // ... and then use the rest of stdin as message body
- // N.B. subject read from body can be further overrided with one specified on command line.
- // recipients are merged. Bcc: lines are deleted
- // N.B. other headers are collected and will be dumped verbatim
- if (opts & OPT_t || !headers) {
- // fetch recipients and (optionally) subject
- char *s;
- while ((s = xmalloc_fgetline(G.fp0)) != NULL) {
- if (0 == strncasecmp("To: ", s, 4) || 0 == strncasecmp("Cc: ", s, 4)) {
- rcptto(sane_address(s+4));
- llist_add_to_end(&headers, s);
- } else if (0 == strncasecmp("Bcc: ", s, 5)) {
- rcptto(sane_address(s+5));
- free(s);
- // N.B. Bcc vanishes from headers!
- } else if (0 == strncmp("Subject: ", s, 9)) {
- // we read subject -> use it verbatim unless it is specified
- // on command line
- if (!(opts & OPT_s))
- llist_add_to_end(&headers, s);
- else
- free(s);
- } else if (s[0]) {
- // misc header
- llist_add_to_end(&headers, s);
- } else {
- free(s);
- break; // stop on the first empty line
- }
- }
- }
-
- // enter "put message" mode
- smtp_check("DATA", 354);
-
- // put headers we could have preread with -t
- for (l = headers; l; l = l->link) {
- printf("%s\r\n", l->data);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(l->data);
- }
-
- // put (possibly encoded) subject
-#if ENABLE_FEATURE_SENDMAIL_MAILX
- if (opts & OPT_s) {
- printf("Subject: ");
- if (opts & OPT_j) {
- printf("=?%s?B?", G.opt_charset);
- encode_base64(NULL, opt_subject, NULL);
- printf("?=");
- } else {
- printf("%s", opt_subject);
- }
- printf("\r\n");
- }
-#endif
-
- // put sender name, $NAME is the default
- if (!(opts & OPT_F))
- opt_fullname = getenv("NAME");
- if (opt_fullname)
- printf("From: \"%s\" <%s>\r\n", opt_fullname, opt_from);
-
- // put notification
- if (opts & OPT_N)
- printf("Disposition-Notification-To: %s\r\n", opt_from);
-
-#if ENABLE_FEATURE_SENDMAIL_MAILXX
- // put errors recipient
- if (opts & OPT_e)
- printf("Errors-To: %s\r\n", opt_errors_to);
-#endif
-
- // make a random string -- it will delimit message parts
- srand(monotonic_us());
- boundary = xasprintf("%d=_%d-%d", rand(), rand(), rand());
-
- // put common headers
- // TODO: do we really need this?
-// printf("Message-ID: <%s>\r\n", boundary);
-
-#if ENABLE_FEATURE_SENDMAIL_MAILX
- // have attachments? -> compose multipart MIME
- if (opt_attachments) {
- const char *fmt;
- const char *p;
- char *q;
-
- printf(
- "Mime-Version: 1.0\r\n"
- "%smultipart/mixed; boundary=\"%s\"\r\n"
- , "Content-Type: "
- , boundary
- );
-
- // body is pseudo attachment read from stdin in first turn
- llist_add_to(&opt_attachments, (char *)"-");
-
- // put body + attachment(s)
- // N.B. all these weird things just to be tiny
- // by reusing string patterns!
- fmt =
- "\r\n--%s\r\n"
- "%stext/plain; charset=%s\r\n"
- "%s%s\r\n"
- "%s"
- ;
- p = G.opt_charset;
- q = (char *)"";
- l = opt_attachments;
- while (l) {
- 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"
- ;
- encode_base64(l->data, (const char *)G.fp0, "\r");
- l = l->link;
- if (l)
- q = bb_get_last_path_component_strip(l->data);
- }
-
- // put message terminator
- printf("\r\n--%s--\r\n" "\r\n", boundary);
-
- // no attachments? -> just dump message
- } else
-#endif
- {
- char *s;
- // terminate headers
- printf("\r\n");
- // put plain text respecting leading dots
- while ((s = xmalloc_fgetline(G.fp0)) != NULL) {
+ // N.B. we marked -f as required option!
+ //if (!G.user) {
+ // // N.B. IMHO getenv("USER") can be way easily spoofed!
+ // G.user = xuid2uname(getuid());
+ // opt_from = xasprintf("%s@%s", G.user, domain);
+ //}
+ //if (ENABLE_FEATURE_CLEAN_UP)
+ // free(domain);
+ smtp_checkp("MAIL FROM:<%s>", opt_from, 250);
+
+ // process message
+
+ // read recipients from message and add them to those given on cmdline.
+ // this means we scan stdin for To:, Cc:, Bcc: lines until an empty line
+ // and then use the rest of stdin as message body
+ code = 0; // set "analyze headers" mode
+ while ((s = xmalloc_fgetline(G.fp0)) != NULL) {
+ // put message lines doubling leading dots
+ if (code) {
// escape leading dots
// N.B. this feature is implied even if no -i (-oi) switch given
// N.B. we need to escape the leading dot regardless of
printf(".");
// dump read line
printf("%s\r\n", s);
+ free(s);
+ continue;
+ }
+
+ // analyze headers
+ // To: or Cc: headers add recipients
+ if (0 == strncasecmp("To: ", s, 4) || 0 == strncasecmp("Bcc: " + 1, s, 4)) {
+ rcptto(sane_address(s+4));
+// goto addh;
+ llist_add_to_end(&list, s);
+ // Bcc: header adds blind copy (hidden) recipient
+ } else if (0 == strncasecmp("Bcc: ", s, 5)) {
+ rcptto(sane_address(s+5));
+ free(s);
+ // N.B. Bcc: vanishes from headers!
+ // other headers go verbatim
+ } else if (s[0]) {
+// addh:
+ llist_add_to_end(&list, s);
+ // the empty line stops analyzing headers
+ } else {
+ free(s);
+ // put recipients specified on cmdline
+ while (*argv) {
+ s = sane_address(*argv);
+ rcptto(s);
+ llist_add_to_end(&list, xasprintf("To: %s", s));
+ argv++;
+ }
+ // enter "put message" mode
+ smtp_check("DATA", 354);
+ // dump the headers
+ while (list) {
+ printf("%s\r\n", (char *) llist_pop(&list));
+ }
+ printf("%s\r\n" + 2); // quirk for format string to be reused
+ // stop analyzing headers
+ code++;
}
}
- // leave "put message" mode
+ // finalize the message
smtp_check(".", 250);
// ... and say goodbye
smtp_check("QUIT", 221);
projects / platform / upstream / busybox.git / commitdiff