+/*
+ * This file is part of DisOrder
+ * Copyright (C) 2007 Richard Kettlewell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+#include <config.h>
+#include "types.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <gcrypt.h>
+
+#include "syscalls.h"
+#include "log.h"
+#include "configuration.h"
+#include "inputline.h"
+#include "addr.h"
+#include "hostname.h"
+#include "sendmail.h"
+#include "base64.h"
+
+/** @brief Get a server response
+ * @param tag Server name
+ * @param in Input stream
+ * @return Response code 0-999 or -1 on error
+ */
+static int getresponse(const char *tag, FILE *in) {
+ char *line;
+
+ while(!inputline(tag, in, &line, CRLF)) {
+ if(line[0] >= '0' && line[0] <= '9'
+ && line[1] >= '0' && line[1] <= '9'
+ && line[2] >= '0' && line[2] <= '9') {
+ const int rc = 10 * (10 * line[0] + line[1]) + line[2] - 111 * '0';
+ if(rc >= 400 && rc <= 599)
+ error(0, "%s: %s", tag, line);
+ if(line[3] != '-') {
+ return rc;
+ }
+ /* else go round for further response lines */
+ } else {
+ error(0, "%s: malformed response: %s", tag, line);
+ return -1;
+ }
+ }
+ if(ferror(in))
+ error(errno, "%s: read error", tag);
+ else
+ error(0, "%s: server closed connection", tag);
+ return -1;
+}
+
+/** @brief Send a command to the server
+ * @param tag Server name
+ * @param out stream to send commands to
+ * @param fmt Format string
+ * @return 0 on success, non-0 on error
+ */
+static int sendcommand(const char *tag, FILE *out, const char *fmt, ...) {
+ va_list ap;
+ int rc;
+
+ va_start(ap, fmt);
+ rc = vfprintf(out, fmt, ap);
+ va_end(ap);
+ if(rc >= 0)
+ rc = fputs("\r\n", out);
+ if(rc >= 0)
+ rc = fflush(out);
+ if(rc >= 0)
+ return 0;
+ error(errno, "%s: write error", tag);
+ return -1;
+}
+
+/** @brief Send a mail message
+ * @param tag Server name
+ * @param in Stream to read responses from
+ * @param out Stream to send commands to
+ * @param sender Sender address (can be "")
+ * @param pubsender Visible sender address (must not be "")
+ * @param recipient Recipient address
+ * @param subject Subject string
+ * @param encoding Body encoding
+ * @param body_type Content-type of body
+ * @param body Text of body (encoded, but \n for newline)
+ * @return 0 on success, non-0 on error
+ */
+static int sendmailfp(const char *tag, FILE *in, FILE *out,
+ const char *sender,
+ const char *pubsender,
+ const char *recipient,
+ const char *subject,
+ const char *encoding,
+ const char *content_type,
+ const char *body) {
+ int rc, sol = 1;
+ const char *ptr;
+ uint8_t idbuf[20];
+ char *id;
+
+ gcry_create_nonce(idbuf, sizeof idbuf);
+ id = mime_to_base64(idbuf, sizeof idbuf);
+ if((rc = getresponse(tag, in)) / 100 != 2)
+ return -1;
+ if(sendcommand(tag, out, "HELO %s", local_hostname()))
+ return -1;
+ if((rc = getresponse(tag, in)) / 100 != 2)
+ return -1;
+ if(sendcommand(tag, out, "MAIL FROM:<%s>", sender))
+ return -1;
+ if((rc = getresponse(tag, in)) / 100 != 2)
+ return -1;
+ if(sendcommand(tag, out, "RCPT TO:<%s>", recipient))
+ return -1;
+ if((rc = getresponse(tag, in)) / 100 != 2)
+ return -1;
+ if(sendcommand(tag, out, "DATA", sender))
+ return -1;
+ if((rc = getresponse(tag, in)) / 100 != 3)
+ return -1;
+ if(fprintf(out, "From: %s\r\n", pubsender) < 0
+ || fprintf(out, "To: %s\r\n", recipient) < 0
+ || fprintf(out, "Subject: %s\r\n", subject) < 0
+ || fprintf(out, "Message-ID: <%s@%s>\r\n", id, local_hostname()) < 0
+ || fprintf(out, "MIME-Version: 1.0\r\n") < 0
+ || fprintf(out, "Content-Type: %s\r\n", content_type) < 0
+ || fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0
+ || fprintf(out, "\r\n") < 0) {
+ write_error:
+ error(errno, "%s: write error", tag);
+ return -1;
+ }
+ for(ptr = body; *ptr; ++ptr) {
+ if(sol && *ptr == '.')
+ if(fputc('.', out) < 0)
+ goto write_error;
+ if(*ptr == '\n') {
+ if(fputc('\r', out) < 0)
+ goto write_error;
+ sol = 1;
+ } else
+ sol = 0;
+ if(fputc(*ptr, out) < 0)
+ goto write_error;
+ }
+ if(!sol)
+ if(fputs("\r\n", out) < 0)
+ goto write_error;
+ if(fprintf(out, ".\r\n") < 0
+ || fflush(out) < 0)
+ goto write_error;
+ if((rc = getresponse(tag, in)) / 100 != 2)
+ return -1;
+ return 0;
+}
+
+/** @brief Send a mail message
+ * @param sender Sender address (can be "")
+ * @param pubsender Visible sender address (must not be "")
+ * @param recipient Recipient address
+ * @param subject Subject string
+ * @param encoding Body encoding
+ * @param content_type Content-type of body
+ * @param body Text of body (encoded, but \n for newline)
+ * @return 0 on success, non-0 on error
+ *
+ * See mime_encode_text() for encoding of text bodies.
+ */
+int sendmail(const char *sender,
+ const char *pubsender,
+ const char *recipient,
+ const char *subject,
+ const char *encoding,
+ const char *content_type,
+ const char *body) {
+ struct stringlist a;
+ char *s[2];
+ struct addrinfo *ai;
+ char *tag;
+ int fdin, fdout, rc;
+ FILE *in, *out;
+
+ static const struct addrinfo pref = {
+ 0,
+ PF_INET,
+ SOCK_STREAM,
+ IPPROTO_TCP,
+ 0,
+ 0,
+ 0,
+ 0
+ };
+
+ /* Find the SMTP server */
+ a.n = 2;
+ a.s = s;
+ s[0] = config->smtp_server;
+ s[1] = (char *)"smtp";
+ if(!(ai = get_address(&a, &pref, &tag)))
+ return -1;
+ fdin = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if(connect(fdin, ai->ai_addr, ai->ai_addrlen) < 0) {
+ error(errno, "error connecting to %s", tag);
+ xclose(fdin);
+ return -1;
+ }
+ if((fdout = dup(fdin)) < 0)
+ fatal(errno, "error calling dup2");
+ if(!(in = fdopen(fdin, "rb")))
+ fatal(errno, "error calling fdopen");
+ if(!(out = fdopen(fdout, "wb")))
+ fatal(errno, "error calling fdopen");
+ rc = sendmailfp(tag, in, out, sender, pubsender, recipient, subject,
+ encoding, content_type, body);
+ fclose(in);
+ fclose(out);
+ return rc;
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
~mdw / disorder / commitdiff