total overhaul of mail applets. again. Vladimir as usual.

7 files changed, 61 insertions, 626 deletions

diff --git a/Config.in b/Config.in
index d2eab538e..4fd9d1111 100644
--- a/Config.in
+++ b/Config.in
@@ -596,6 +596,7 @@ source util-linux/Config.in
 source miscutils/Config.in
 source networking/Config.in
 source printutils/Config.in
+source mailutils/Config.in
 source procps/Config.in
 source runit/Config.in
 source selinux/Config.in
diff --git a/Makefile b/Makefile
index 5d6546716..495b16cab 100644
--- a/Makefile
+++ b/Makefile
@@ -456,6 +456,7 @@ libs-y		:= \
                 libbb/ \
                 libpwdgrp/ \
                 loginutils/ \
+                mailutils/ \
                 miscutils/ \
                 modutils/ \
                 networking/ \
diff --git a/include/applets.h b/include/applets.h
index d52f9f034..0e4cbd5a3 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -151,7 +151,6 @@ USE_FBSPLASH(APPLET(fbsplash, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_FDFLUSH(APPLET_ODDNAME(fdflush, freeramdisk, _BB_DIR_BIN, _BB_SUID_NEVER, fdflush))
 USE_FDFORMAT(APPLET(fdformat, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FDISK(APPLET(fdisk, _BB_DIR_SBIN, _BB_SUID_NEVER))
-//USE_FETCHMAIL(APPLET(fetchmail, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_FEATURE_GREP_FGREP_ALIAS(APPLET_ODDNAME(fgrep, grep, _BB_DIR_BIN, _BB_SUID_NEVER, fgrep))
 USE_FIND(APPLET_NOEXEC(find, find, _BB_DIR_USR_BIN, _BB_SUID_NEVER, find))
 USE_FINDFS(APPLET(findfs, _BB_DIR_SBIN, _BB_SUID_MAYBE))
@@ -237,8 +236,8 @@ USE_LSATTR(APPLET(lsattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_LSMOD(APPLET(lsmod, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, _BB_DIR_SBIN, _BB_SUID_NEVER, modprobe))
 USE_UNLZMA(APPLET_ODDNAME(lzmacat, unlzma, _BB_DIR_USR_BIN, _BB_SUID_NEVER, lzmacat))
-USE_FEATURE_SENDMAIL_MAILX(APPLET_ODDNAME(mail, sendmail, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sendmail))
 USE_MAKEDEVS(APPLET(makedevs, _BB_DIR_SBIN, _BB_SUID_NEVER))
+USE_MAKEMIME(APPLET(makemime, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_MAN(APPLET(man, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MATCHPATHCON(APPLET(matchpathcon, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_MD5SUM(APPLET_ODDNAME(md5sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, md5sum))
@@ -281,6 +280,7 @@ USE_PING6(APPLET(ping6, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_PIPE_PROGRESS(APPLET(pipe_progress, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_PIVOT_ROOT(APPLET(pivot_root, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_PKILL(APPLET_ODDNAME(pkill, pgrep, _BB_DIR_USR_BIN, _BB_SUID_NEVER, pkill))
+USE_POPMAILDIR(APPLET(popmaildir, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_HALT(APPLET_ODDNAME(poweroff, halt, _BB_DIR_SBIN, _BB_SUID_NEVER, poweroff))
 USE_PRINTENV(APPLET(printenv, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_PRINTF(APPLET_NOFORK(printf, printf, _BB_DIR_USR_BIN, _BB_SUID_NEVER, printf))
@@ -295,6 +295,7 @@ USE_READLINK(APPLET(readlink, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_READPROFILE(APPLET(readprofile, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_REALPATH(APPLET(realpath, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_HALT(APPLET_ODDNAME(reboot, halt, _BB_DIR_SBIN, _BB_SUID_NEVER, reboot))
+USE_REFORMIME(APPLET(reformime, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_RENICE(APPLET(renice, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_RESET(APPLET(reset, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_RESIZE(APPLET(resize, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
diff --git a/include/usage.h b/include/usage.h
index 4ee82059e..19af3486a 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1095,18 +1095,6 @@
      "\n        -H HEADS\n" \
      "\n        -S SECTORS" \
 
-#define fetchmail_trivial_usage \
-       "[-w timeout] [-H [user:pass@]server[:port]] [-S] [-t] [-z] maildir [prog]"
-#define fetchmail_full_usage "\n\n" \
-       "Fetch content of remote mailbox to local maildir\n" \
-     "\nOptions:" \
-     "\n        -w timeout      Network timeout" \
-     "\n        -H [user:pass@]server[:port] Server" \
-     "\n        -S              Use openssl connection helper for secure servers" \
-     "\n        -t              Get only headers" \
-     "\n        -z              Delete messages on server" \
-     "\n        prog            Run 'prog <message_file>' on message delivery" \
-
 #define blkid_trivial_usage \
        ""
 #define blkid_full_usage "\n\n" \
@@ -2378,6 +2366,16 @@
        "/dev/hda[0-15]\n"
 #endif
 
+#define makemime_trivial_usage \
+       "[OPTION]... [FILE]..."
+#define makemime_full_usage "\n\n" \
+       "Create MIME-encoded message\n" \
+     "\nOptions:" \
+     "\n        -C      Charset" \
+     "\n        -e      Tranfer encoding. Ignored. base64 is assumed" \
+     "\n" \
+     "\nOther options are silently ignored." \
+
 #define man_trivial_usage \
        "[OPTION]... [MANPAGE]..."
 #define man_full_usage "\n\n" \
@@ -3095,6 +3093,33 @@
      "\n        -v      Negate the matching" \
      "\n        -x      Match whole name (not substring)" \
 
+#define popmaildir_trivial_usage \
+       "[OPTIONS] Maildir [connection-helper ...]"
+#define popmaildir_full_usage "\n\n" \
+       "Fetch content of remote mailbox to local maildir\n" \
+     "\nOptions:" \
+     "\n        -b              Binary mode. Ignored" \
+     "\n        -d              Debug. Ignored" \
+     "\n        -m              Show used memory. Ignored" \
+     "\n        -V              Show version. Ignored" \
+     "\n        -c              Use tcpclient. Ignored" \
+     "\n        -a              Use APOP protocol. Implied. If server supports APOP -> use it" \
+     "\n        -s              Skip authorization" \
+     "\n        -T              Get messages with TOP instead with RETR" \
+     "\n        -k              Keep retrieved messages on the server" \
+     "\n        -t timeout      Set network timeout" \
+     USE_FEATURE_POPMAILDIR_DELIVERY( \
+     "\n        -F \"program arg1 arg2 ...\"    Filter by program. May be multiple" \
+     "\n        -M \"program arg1 arg2 ...\"    Deliver by program" \
+     ) \
+     "\n        -R size         Remove old messages on the server >= size (in bytes). Ignored" \
+     "\n        -Z N1-N2        Remove messages from N1 to N2 (dangerous). Ignored" \
+     "\n        -L size         Do not retrieve new messages >= size (in bytes). Ignored" \
+     "\n        -H lines        Type specified number of lines of a message. Ignored"
+#define popmaildir_example_usage \
+       "$ popmaildir -k ~/Maildir -- nc pop.drvv.ru 110 [<password_file]\n" \
+       "$ popmaildir ~/Maildir -- openssl s_client -quiet -connect pop.gmail.com:995 [<password_file]\n"
+
 #define poweroff_trivial_usage \
        "[-d delay] [-n] [-f]"
 #define poweroff_full_usage "\n\n" \
@@ -3250,6 +3275,17 @@
      "\n        -n      No call to sync()" \
      "\n        -f      Force reboot (don't go through init)" \
 
+#define reformime_trivial_usage \
+       "[OPTION]... [FILE]..."
+#define reformime_full_usage "\n\n" \
+       "Parse MIME-encoded message\n" \
+     "\nOptions:" \
+     "\n        -x prefix       Extract content of MIME sections to files" \
+     "\n        -X prog [args]  Filter content of MIME sections through prog." \
+     "\n                        Must be the last option" \
+     "\n" \
+     "\nOther options are silently ignored." \
+
 #define renice_trivial_usage \
        "{{-n INCREMENT} | PRIORITY} [[-p | -g | -u] ID...]"
 #define renice_full_usage "\n\n" \
@@ -3484,9 +3520,7 @@
 #define selinuxenabled_full_usage ""
 
 #define sendmail_trivial_usage \
-       "[-w timeout] [-H [user:pass@]server[:port]] [-S]\n" \
-       "[-N type] [-f sender] [-F fullname] " \
-       USE_FEATURE_SENDMAIL_MAILX("[-s subject] [-c cc-rcpt]... [-j charset] [-a attach]... [-e err-rcpt] ") "[-t] [rcpt]..."
+       "[OPTIONS] [rcpt]..."
 #define sendmail_full_usage "\n\n" \
        "Send an email\n" \
      "\nOptions:" \
@@ -3498,11 +3532,15 @@
      "\n        -F fullname     Sender full name. Overrides $NAME" \
         USE_FEATURE_SENDMAIL_MAILX( \
      "\n        -s subject      Subject" \
-     "\n        -c rcpt         Cc: recipient. May be multiple" \
-     "\n        -j charset      Assume charset for body and subject (" CONFIG_FEATURE_SENDMAIL_CHARSET ")" \
+     "\n        -j charset      Assume charset for body and subject (" CONFIG_FEATURE_MIME_CHARSET ")" \
      "\n        -a file         File to attach. May be multiple" \
+     "\n        -H \"prog args...\" Use external connection helper. E.g. openssl for secure servers" \
+     "\n        -S server[:port] Server" \
+        ) \
+        USE_FEATURE_SENDMAIL_MAILXX( \
+     "\n        -c rcpt         Cc: recipient. May be multiple" \
      "\n        -e rcpt         Errors-To: recipient" \
-        )
+        )
      "\n        -t              Read recipients and subject from body" \
      "\n" \
      "\nOther options are silently ignored; -oi is implied" \
diff --git a/networking/Config.in b/networking/Config.in
index 3ae77e119..95f894230 100644
--- a/networking/Config.in
+++ b/networking/Config.in
@@ -681,47 +681,6 @@ config ROUTE
         help
           Route displays or manipulates the kernel's IP routing tables.
 
-config SENDMAIL
-        bool "sendmail"
-        default n
-        help
-          Barebones sendmail.
-
-config FEATURE_SENDMAIL_MAILX
-        bool "Allow to specify subject, attachments and their charset"
-        default y
-        depends on SENDMAIL
-        help
-          Allow to specify subject, attachments and their charset.
-
-config FEATURE_SENDMAIL_MAILXX
-        bool "Allow to specify Cc: addresses and some additional headers"
-        default n
-        depends on FEATURE_SENDMAIL_MAILX
-        help
-          Allow to specify Cc: addresses and some additional headers:
-          Errors-To:
-
-config FEATURE_SENDMAIL_SSL
-        bool "Allow to communicate via SSL/TLS"
-        default y
-        depends on SENDMAIL
-        help
-          Allow to use secure connections provided by openssl. E.g. @gmail.com.
-
-config FEATURE_SENDMAIL_CHARSET
-        string "Default charset"
-        default "utf-8"
-        depends on SENDMAIL
-        help
-          Default charset of the message.
-
-config FETCHMAIL
-        bool "fetchmail"
-        default n
-        help
-          Barebones fetchmail.
-
 config SLATTACH
         bool "slattach"
         default n
diff --git a/networking/Kbuild b/networking/Kbuild
index 75cc20f58..63d0745f8 100644
--- a/networking/Kbuild
+++ b/networking/Kbuild
@@ -11,7 +11,6 @@ lib-$(CONFIG_BRCTL)        += brctl.o
 lib-$(CONFIG_DNSD)         += dnsd.o
 lib-$(CONFIG_ETHER_WAKE)   += ether-wake.o
 lib-$(CONFIG_FAKEIDENTD)   += isrv_identd.o isrv.o
-lib-$(CONFIG_FETCHMAIL)    += sendmail.o
 lib-$(CONFIG_FTPGET)       += ftpgetput.o
 lib-$(CONFIG_FTPPUT)       += ftpgetput.o
 lib-$(CONFIG_HOSTNAME)     += hostname.o
@@ -30,7 +29,6 @@ lib-$(CONFIG_PING)         += ping.o
 lib-$(CONFIG_PING6)        += ping.o
 lib-$(CONFIG_PSCAN)        += pscan.o
 lib-$(CONFIG_ROUTE)        += route.o
-lib-$(CONFIG_SENDMAIL)     += sendmail.o
 lib-$(CONFIG_SLATTACH)     += slattach.o
 lib-$(CONFIG_TC)           += tc.o
 lib-$(CONFIG_TELNET)       += telnet.o
diff --git a/networking/sendmail.c b/networking/sendmail.c
deleted file mode 100644
index 9602b89ec..000000000
--- a/networking/sendmail.c
+++ /dev/null
@@ -1,563 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * bare bones sendmail
- *
- * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
- *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
- */
-#include "libbb.h"
-
-struct globals {
-        pid_t helper_pid;
-        unsigned timeout;
-        FILE *fp0; // initial stdin
-        // arguments for SSL connection helper
-        const char *xargs[9];
-};
-#define G (*ptr_to_globals)
-#define helper_pid      (G.helper_pid)
-#define timeout         (G.timeout   )
-#define fp0             (G.fp0       )
-#define xargs           (G.xargs     )
-#define INIT_G() do { \
-        SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
-        xargs[0] = "openssl"; \
-        xargs[1] = "s_client"; \
-        xargs[2] = "-quiet"; \
-        xargs[3] = "-connect"; \
-        /*xargs[4] = "localhost";*/ \
-        xargs[5] = "-tls1"; \
-        xargs[6] = "-starttls"; \
-        xargs[7] = "smtp"; \
-} while (0)
-
-#define opt_connect (xargs[4])
-
-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
-        FILE *fp = fp;
-        ssize_t len = len;
-        char dst_buf[DST_BUF_SIZE + 1];
-
-        if (fname) {
-                fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : fp0;
-                src_buf = bb_common_bufsiz1;
-        // N.B. strlen(NULL) segfaults!
-        } else if (text) {
-                // though we do not call uuencode(NULL, NULL) explicitly
-                // still we do not want to break things suddenly
-                len = strlen(text);
-        } else
-                return;
-
-        while (1) {
-                size_t size;
-                if (fname) {
-                        size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp);
-                        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) {
-                        printf("\r\n");
-                } else {
-                        src_buf += size;
-                        len -= size;
-                }
-                fwrite(dst_buf, 1, 4 * ((size + 2) / 3), stdout);
-        }
-        if (fname)
-                fclose(fp);
-#undef src_buf
-}
-
-
-#if ENABLE_FEATURE_SENDMAIL_SSL
-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)
-{
-#define err 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)) {
-//                      if (WEXITSTATUS(err))
-                                bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err));
-//                      else
-//                              kill(0, SIGCONT);
-                }
-#undef err
-}
-
-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, (char **)argv);
-                _exit(127);
-        }
-        // parent: check whether child is alive
-        bb_signals(0
-                + (1 << SIGCHLD)
-                + (1 << SIGALRM)
-                , signal_handler);
-        signal_handler(SIGCHLD);
-        // child seems OK -> parent goes on
-}
-#else
-#define kill_helper() ((void)0)
-#define launch_helper(x) bb_error_msg_and_die("no SSL support")
-#endif
-
-static const char *command(const char *fmt, const char *param)
-{
-        const char *msg = fmt;
-        alarm(timeout);
-        if (msg) {
-                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;
-        const 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
-        while ((answer = xmalloc_fgetline(stdin)) != NULL)
-                if (strlen(answer) <= 3 || '-' != answer[3])
-                        break;
-        if (answer) {
-                int n = atoi(answer);
-                alarm(0);
-                free(answer);
-                if (-1 == code || n == code)
-                        return n;
-        }
-        kill_helper();
-        bb_error_msg_and_die("%s failed", msg);
-}
-
-static inline int smtp_check(const char *fmt, int code)
-{
-        return smtp_checkp(fmt, NULL, code);
-}
-
-// 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;
-}
-
-// NB: parse_url can modify url[] (despite const), but only if '@' is there
-static const char *parse_url(const char *url, const char **user, const char **pass)
-{
-        // parse [user[:pass]@]host
-        // return host
-        char *s = strchr(url, '@');
-        *user = *pass = NULL;
-        if (s) {
-                *s++ = '\0';
-                *user = url;
-                url = s;
-                s = strchr(*user, ':');
-                if (s) {
-                        *s++ = '\0';
-                        *pass = s;
-                }
-        }
-        return url;
-}
-
-static void rcptto(const char *s)
-{
-        smtp_checkp("RCPT TO:<%s>", s, 250);
-}
-
-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;
-        const char *opt_charset = CONFIG_FEATURE_SENDMAIL_CHARSET;
-#if ENABLE_FEATURE_SENDMAIL_MAILXX
-        llist_t *opt_carboncopies = NULL;
-        char *opt_errors_to;
-#endif
-#endif
-        char *opt_from, *opt_fullname;
-        const char *opt_user;
-        const char *opt_pass;
-        int code;
-        char *boundary;
-        llist_t *l;
-        llist_t *headers = NULL;
-        char *domain = sane(safe_getdomainname());
-        unsigned opts;
-
-        enum {
-                OPT_w = 1 << 0,         // network timeout
-                OPT_H = 1 << 1,         // [user:password@]server[:port]
-                OPT_S = 1 << 2,         // connect using openssl s_client helper
-                OPT_t = 1 << 3,         // read message for recipients
-                OPT_N = 1 << 4,         // request notification
-                OPT_f = 1 << 5,         // sender address
-                OPT_F = 1 << 6,         // sender name, overrides $NAME
-#if ENABLE_FEATURE_SENDMAIL_MAILX
-                OPT_s = 1 << 7,         // subject
-                OPT_j = 1 << 8,         // assumed charset
-                OPT_a = 1 << 9,         // attachment(s)
-#if ENABLE_FEATURE_SENDMAIL_MAILXX
-                OPT_c = 1 << 10,        // carbon copy
-                OPT_e = 1 << 11,        // errors-to address
-#endif
-#endif
-        };
-
-        // init global variables
-        INIT_G();
-
-        // save initial stdin since body is piped!
-        xdup2(STDIN_FILENO, 3);
-        fp0 = fdopen(3, "r");
-
-        // parse options
-        opt_complementary = "w+:a::" USE_FEATURE_SENDMAIL_MAILXX("c::");
-        opts = getopt32(argv,
-                "w:H:St" "N:f:F:" USE_FEATURE_SENDMAIL_MAILX("s:j:a:") 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 */, &opt_connect /* -H */,
-                NULL, &opt_from, &opt_fullname,
-                USE_FEATURE_SENDMAIL_MAILX(&opt_subject, &opt_charset, &opt_attachments,)
-                USE_FEATURE_SENDMAIL_MAILXX(&opt_carboncopies, &opt_errors_to,)
-                NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
-        );
-        //argc -= optind;
-        argv += optind;
-
-        // connect to server
-        // host[:port] not specified ? -> use $SMTPHOST. no $SMTPHOST ? -> use localhost
-        if (!(opts & OPT_H)) {
-                opt_connect = getenv("SMTPHOST");
-                if (!opt_connect)
-                        opt_connect = "127.0.0.1";
-        }
-        // fetch username and password, if any
-        // NB: parse_url modifies opt_connect[] ONLY if '@' is there.
-        // Thus "127.0.0.1" won't be modified, an is ok that it is RO.
-        opt_connect = parse_url(opt_connect, &opt_user, &opt_pass);
-
-        // username must be defined!
-        if (!opt_user) {
-                // N.B. IMHO getenv("USER") can be way easily spoofed!
-                opt_user = bb_getpwuid(NULL, -1, getuid());
-        }
-
-        // SSL ordered? ->
-        if (opts & OPT_S) {
-                // ... use openssl helper
-                launch_helper(xargs);
-        // no SSL ordered? ->
-        } else {
-                // ... make plain connect
-                int fd = create_and_connect_stream_or_die(opt_connect, 25);
-                // make ourselves a simple IO filter
-                // from now we know nothing about network :)
-                xmove_fd(fd, STDIN_FILENO);
-                xdup2(STDIN_FILENO, STDOUT_FILENO);
-        }
-
-        // got no sender address? -> use username as a resort
-        if (!(opts & OPT_f)) {
-                opt_from = xasprintf("%s@%s", opt_user, domain);
-        }
-
-        // introduce to server
-
-        // we didn't use SSL helper? ->
-        if (!(opts & OPT_S)) {
-                // ... wait for initial server OK
-                smtp_check(NULL, 220);
-        }
-
-        // we should start with modern EHLO
-        if (250 != smtp_checkp("EHLO %s", domain, -1)) {
-                smtp_checkp("HELO %s", domain, 250);
-        }
-        if (ENABLE_FEATURE_CLEAN_UP)
-                free(domain);
-
-        // set sender
-        // NOTE: if password has not been specified
-        // then no authentication is possible
-        code = (opt_pass ? -1 : 250);
-        // 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)) {
-                        uuencode(NULL, opt_user); // opt_user != NULL
-                        smtp_check("", 334);
-                        uuencode(NULL, opt_pass);
-                        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(*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(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(fp0)) != NULL) {
-                        if (0 == strncasecmp("To: ", s, 4) || 0 == strncasecmp("Cc: ", s, 4)) {
-                                rcptto(sane(s+4));
-                                llist_add_to_end(&headers, s);
-                        } else if (0 == strncasecmp("Bcc: ", s, 5)) {
-                                rcptto(sane(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 ENABLE_FEATURE_SENDMAIL_MAILX
-                                if (opts & OPT_s)
-                                        free(s);
-                                else
-#endif
-                                        llist_add_to_end(&headers, 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_j)
-                sane((char *)opt_charset);
-        if (opts & OPT_s) {
-                printf("Subject: ");
-                if (opts & OPT_j) {
-                        printf("=?%s?B?", opt_charset);
-                        uuencode(NULL, opt_subject);
-                        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 = 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"
-                        ;
-                        uuencode(l->data, NULL);
-                        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(fp0)) != NULL) {
-                        // 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
-                        // whether it is single or not character on the line
-                        if ('.' == s[0] /*&& '\0' == s[1] */)
-                                printf(".");
-                        // dump read line
-                        printf("%s\r\n", s);
-                }
-        }
-
-        // leave "put message" mode
-        smtp_check(".", 250);
-        // ... and say goodbye
-        smtp_check("QUIT", 221);
-        // cleanup
-        if (ENABLE_FEATURE_CLEAN_UP)
-                fclose(fp0);
-
-        return EXIT_SUCCESS;
-}