[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/mailutils/sendmail.c b/ap/app/busybox/src/mailutils/sendmail.c
new file mode 100644
index 0000000..c426e9d
--- /dev/null
+++ b/ap/app/busybox/src/mailutils/sendmail.c
@@ -0,0 +1,357 @@
+/* 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 source tree.
+ */
+
+//kbuild:lib-$(CONFIG_SENDMAIL) += sendmail.o mail.o
+
+//usage:#define sendmail_trivial_usage
+//usage: "[OPTIONS] [RECIPIENT_EMAIL]..."
+//usage:#define sendmail_full_usage "\n\n"
+//usage: "Read email from stdin and send it\n"
+//usage: "\nStandard options:"
+//usage: "\n -t Read additional recipients from message body"
+//usage: "\n -f SENDER Sender (required)"
+//usage: "\n -o OPTIONS Various options. -oi implied, others are ignored"
+//usage: "\n -i -oi synonym. implied and ignored"
+//usage: "\n"
+//usage: "\nBusybox specific options:"
+//usage: "\n -v Verbose"
+//usage: "\n -w SECS Network timeout"
+//usage: "\n -H 'PROG ARGS' Run connection helper"
+//usage: "\n Examples:"
+//usage: "\n -H 'exec openssl s_client -quiet -tls1 -starttls smtp"
+//usage: "\n -connect smtp.gmail.com:25' <email.txt"
+//usage: "\n [4<username_and_passwd.txt | -auUSER -apPASS]"
+//usage: "\n -H 'exec openssl s_client -quiet -tls1"
+//usage: "\n -connect smtp.gmail.com:465' <email.txt"
+//usage: "\n [4<username_and_passwd.txt | -auUSER -apPASS]"
+//usage: "\n -S HOST[:PORT] Server"
+//usage: "\n -auUSER Username for AUTH LOGIN"
+//usage: "\n -apPASS Password for AUTH LOGIN"
+////usage: "\n -amMETHOD Authentication method. Ignored. LOGIN is implied"
+//usage: "\n"
+//usage: "\nOther options are silently ignored; -oi -t is implied"
+//usage: IF_MAKEMIME(
+//usage: "\nUse makemime to create emails with attachments"
+//usage: )
+
+#include "libbb.h"
+#include "mail.h"
+
+// limit maximum allowed number of headers to prevent overflows.
+// set to 0 to not limit
+#define MAX_HEADERS 256
+
+static void send_r_n(const char *s)
+{
+ if (verbose)
+ bb_error_msg("send:'%s'", s);
+ printf("%s\r\n", s);
+}
+
+static int smtp_checkp(const char *fmt, const char *param, int code)
+{
+ char *answer;
+ char *msg = send_mail_command(fmt, param);
+ // read stdin
+ // if the string has a form NNN- -- 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 (verbose)
+ bb_error_msg("recv:'%.*s'", (int)(strchrnul(answer, '\r') - answer), answer);
+ if (strlen(answer) <= 3 || '-' != answer[3])
+ break;
+ free(answer);
+ }
+ if (answer) {
+ int n = atoi(answer);
+ if (timeout)
+ alarm(0);
+ free(answer);
+ if (-1 == code || n == code) {
+ free(msg);
+ return n;
+ }
+ }
+ bb_error_msg_and_die("%s failed", msg);
+}
+
+static int smtp_check(const char *fmt, int code)
+{
+ return smtp_checkp(fmt, NULL, code);
+}
+
+// strip argument of bad chars
+static char *sane_address(char *str)
+{
+ char *s = str;
+ char *p = s;
+ while (*s) {
+ if (isalnum(*s) || '_' == *s || '-' == *s || '.' == *s || '@' == *s) {
+ *p++ = *s;
+ }
+ s++;
+ }
+ *p = '\0';
+ return str;
+}
+
+static void rcptto(const char *s)
+{
+ // N.B. we don't die if recipient is rejected, for the other recipients may be accepted
+ if (250 != smtp_checkp("RCPT TO:<%s>", s, -1))
+ bb_error_msg("Bad recipient: <%s>", s);
+}
+
+int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int sendmail_main(int argc UNUSED_PARAM, char **argv)
+{
+ char *opt_connect = opt_connect;
+ char *opt_from;
+ char *s;
+ llist_t *list = NULL;
+ char *host = sane_address(safe_gethostname());
+ unsigned nheaders = 0;
+ int code;
+
+ enum {
+ //--- 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!
+ OPT_i = 1 << 3, // IMPLIED!
+ //--- BB specific options
+ OPT_w = 1 << 4, // network timeout
+ OPT_H = 1 << 5, // use external connection helper
+ OPT_S = 1 << 6, // specify connection string
+ OPT_a = 1 << 7, // authentication tokens
+ OPT_v = 1 << 8, // verbosity
+ };
+
+ // init global variables
+ INIT_G();
+
+ // save initial stdin since body is piped!
+ xdup2(STDIN_FILENO, 3);
+ G.fp0 = xfdopen_for_read(3);
+
+ // parse options
+ // -v is a counter, -f is required. -H and -S are mutually exclusive, -a is a list
+ opt_complementary = "vv: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:iw:H:S:a::v", &opt_from, NULL,
+ &timeout, &opt_connect, &opt_connect, &list, &verbose);
+ //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
+
+ // connection helper ordered? ->
+ if (opts & OPT_H) {
+ const char *args[] = { "sh", "-c", opt_connect, NULL };
+ // plug it in
+ launch_helper(args);
+ // Now:
+ // our stdout will go to helper's stdin,
+ // helper's stdout will be available on our stdin.
+
+ // Wait for initial server message.
+ // If helper (such as openssl) invokes STARTTLS, the initial 220
+ // is swallowed by helper (and not repeated after TLS is initiated).
+ // We will send NOOP cmd to server and check the response.
+ // We should get 220+250 on plain connection, 250 on STARTTLSed session.
+ //
+ // The problem here is some servers delay initial 220 message,
+ // and consider client to be a spammer if it starts sending cmds
+ // before 220 reached it. The code below is unsafe in this regard:
+ // in non-STARTTLSed case, we potentially send NOOP before 220
+ // is sent by server.
+ // Ideas? (--delay SECS opt? --assume-starttls-helper opt?)
+ code = smtp_check("NOOP", -1);
+ if (code == 220)
+ // we got 220 - this is not STARTTLSed connection,
+ // eat 250 response to our NOOP
+ smtp_check(NULL, 250);
+ else
+ if (code != 250)
+ bb_error_msg_and_die("SMTP init failed");
+ } else {
+ // vanilla connection
+ int fd;
+ // host[:port] not explicitly specified? -> use $SMTPHOST
+ // no $SMTPHOST? -> use localhost
+ if (!(opts & OPT_S)) {
+ opt_connect = getenv("SMTPHOST");
+ if (!opt_connect)
+ opt_connect = (char *)"127.0.0.1";
+ }
+ // do connect
+ fd = create_and_connect_stream_or_die(opt_connect, 25);
+ // and make ourselves a simple IO filter
+ xmove_fd(fd, STDIN_FILENO);
+ xdup2(STDIN_FILENO, STDOUT_FILENO);
+
+ // Wait for initial server 220 message
+ smtp_check(NULL, 220);
+ }
+
+ // we should start with modern EHLO
+ if (250 != smtp_checkp("EHLO %s", host, -1))
+ smtp_checkp("HELO %s", host, 250);
+ free(host);
+
+ // 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 algorythm
+ // since sendmail historically offers no means to specify secrets on cmdline.
+ // 1) server can require no authentication ->
+ // we must just provide a (possibly fake) reply address.
+ // 2) server can require AUTH ->
+ // we must provide valid username and password along with a (possibly fake) reply address.
+ // For the sake of security username and password are to be read either from console or from a secured file.
+ // Since reading from console may defeat usability, the solution is either to read from a predefined
+ // file descriptor (e.g. 4), or again from a secured file.
+
+ // got no sender address? -> use system username as a resort
+ // 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);
+ //}
+ 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) {
+ dump:
+ // 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
+ // whether it is single or not character on the line
+ if ('.' == s[0] /*&& '\0' == s[1] */)
+ printf(".");
+ // dump read line
+ send_r_n(s);
+ free(s);
+ continue;
+ }
+
+ // analyze headers
+ // To: or Cc: headers add recipients
+ if (opts & OPT_t) {
+ if (0 == strncasecmp("To:", s, 3) || 0 == strncasecmp("Bcc:" + 1, s, 3)) {
+ rcptto(sane_address(s+3));
+ goto addheader;
+ }
+ // Bcc: header adds blind copy (hidden) recipient
+ if (0 == strncasecmp("Bcc:", s, 4)) {
+ rcptto(sane_address(s+4));
+ free(s);
+ continue; // N.B. Bcc: vanishes from headers!
+ }
+ }
+ if (strchr(s, ':') || (list && isspace(s[0]))) {
+ // other headers go verbatim
+ // N.B. RFC2822 2.2.3 "Long Header Fields" allows for headers to occupy several lines.
+ // Continuation is denoted by prefixing additional lines with whitespace(s).
+ // Thanks (stefan.seyfried at googlemail.com) for pointing this out.
+ addheader:
+ // N.B. we allow MAX_HEADERS generic headers at most to prevent attacks
+ if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)
+ goto bail;
+ llist_add_to_end(&list, s);
+ } else {
+ // a line without ":" (an empty line too, by definition) doesn't look like a valid header
+ // so stop "analyze headers" mode
+ reenter:
+ // put recipients specified on cmdline
+ while (*argv) {
+ char *t = sane_address(*argv);
+ rcptto(t);
+ //if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)
+ // goto bail;
+ llist_add_to_end(&list, xasprintf("To: %s", t));
+ argv++;
+ }
+ // enter "put message" mode
+ // N.B. DATA fails iff no recipients were accepted (or even provided)
+ // in this case just bail out gracefully
+ if (354 != smtp_check("DATA", -1))
+ goto bail;
+ // dump the headers
+ while (list) {
+ send_r_n((char *) llist_pop(&list));
+ }
+ // stop analyzing headers
+ code++;
+ // N.B. !s means: we read nothing, and nothing to be read in the future.
+ // just dump empty line and break the loop
+ if (!s) {
+ send_r_n("");
+ break;
+ }
+ // go dump message body
+ // N.B. "s" already contains the first non-header line, so pretend we read it from input
+ goto dump;
+ }
+ }
+ // odd case: we didn't stop "analyze headers" mode -> message body is empty. Reenter the loop
+ // N.B. after reenter code will be > 0
+ if (!code)
+ goto reenter;
+
+ // finalize the message
+ smtp_check(".", 250);
+ bail:
+ // ... and say goodbye
+ smtp_check("QUIT", 221);
+ // cleanup
+ if (ENABLE_FEATURE_CLEAN_UP)
+ fclose(G.fp0);
+
+ return EXIT_SUCCESS;
+}