| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | |
| 21 | #include <config.h> |
| 22 | #include "types.h" |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <errno.h> |
| 26 | #include <stdarg.h> |
| 27 | #include <sys/socket.h> |
| 28 | #include <netdb.h> |
| 29 | #include <unistd.h> |
| 30 | #include <gcrypt.h> |
| 31 | #include <time.h> |
| 32 | #include <netinet/in.h> |
| 33 | |
| 34 | #include "syscalls.h" |
| 35 | #include "log.h" |
| 36 | #include "configuration.h" |
| 37 | #include "inputline.h" |
| 38 | #include "addr.h" |
| 39 | #include "hostname.h" |
| 40 | #include "sendmail.h" |
| 41 | #include "base64.h" |
| 42 | |
| 43 | /** @brief Get a server response |
| 44 | * @param tag Server name |
| 45 | * @param in Input stream |
| 46 | * @return Response code 0-999 or -1 on error |
| 47 | */ |
| 48 | static int getresponse(const char *tag, FILE *in) { |
| 49 | char *line; |
| 50 | |
| 51 | while(!inputline(tag, in, &line, CRLF)) { |
| 52 | if(line[0] >= '0' && line[0] <= '9' |
| 53 | && line[1] >= '0' && line[1] <= '9' |
| 54 | && line[2] >= '0' && line[2] <= '9') { |
| 55 | const int rc = 10 * (10 * line[0] + line[1]) + line[2] - 111 * '0'; |
| 56 | if(rc >= 400 && rc <= 599) |
| 57 | error(0, "%s: %s", tag, line); |
| 58 | if(line[3] != '-') { |
| 59 | return rc; |
| 60 | } |
| 61 | /* else go round for further response lines */ |
| 62 | } else { |
| 63 | error(0, "%s: malformed response: %s", tag, line); |
| 64 | return -1; |
| 65 | } |
| 66 | } |
| 67 | if(ferror(in)) |
| 68 | error(errno, "%s: read error", tag); |
| 69 | else |
| 70 | error(0, "%s: server closed connection", tag); |
| 71 | return -1; |
| 72 | } |
| 73 | |
| 74 | /** @brief Send a command to the server |
| 75 | * @param tag Server name |
| 76 | * @param out stream to send commands to |
| 77 | * @param fmt Format string |
| 78 | * @return 0 on success, non-0 on error |
| 79 | */ |
| 80 | static int sendcommand(const char *tag, FILE *out, const char *fmt, ...) { |
| 81 | va_list ap; |
| 82 | int rc; |
| 83 | |
| 84 | va_start(ap, fmt); |
| 85 | rc = vfprintf(out, fmt, ap); |
| 86 | va_end(ap); |
| 87 | if(rc >= 0) |
| 88 | rc = fputs("\r\n", out); |
| 89 | if(rc >= 0) |
| 90 | rc = fflush(out); |
| 91 | if(rc >= 0) |
| 92 | return 0; |
| 93 | error(errno, "%s: write error", tag); |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | /** @brief Send a mail message |
| 98 | * @param tag Server name |
| 99 | * @param in Stream to read responses from |
| 100 | * @param out Stream to send commands to |
| 101 | * @param sender Sender address (can be "") |
| 102 | * @param pubsender Visible sender address (must not be "") |
| 103 | * @param recipient Recipient address |
| 104 | * @param subject Subject string |
| 105 | * @param encoding Body encoding |
| 106 | * @param body_type Content-type of body |
| 107 | * @param body Text of body (encoded, but \n for newline) |
| 108 | * @return 0 on success, non-0 on error |
| 109 | */ |
| 110 | static int sendmailfp(const char *tag, FILE *in, FILE *out, |
| 111 | const char *sender, |
| 112 | const char *pubsender, |
| 113 | const char *recipient, |
| 114 | const char *subject, |
| 115 | const char *encoding, |
| 116 | const char *content_type, |
| 117 | const char *body) { |
| 118 | int rc, sol = 1; |
| 119 | const char *ptr; |
| 120 | uint8_t idbuf[20]; |
| 121 | char *id; |
| 122 | struct tm ut; |
| 123 | time_t now; |
| 124 | char date[128]; |
| 125 | |
| 126 | time(&now); |
| 127 | gmtime_r(&now, &ut); |
| 128 | strftime(date, sizeof date, "%a, %d %b %Y %H:%M:%S +0000", &ut); |
| 129 | gcry_create_nonce(idbuf, sizeof idbuf); |
| 130 | id = mime_to_base64(idbuf, sizeof idbuf); |
| 131 | if((rc = getresponse(tag, in)) / 100 != 2) |
| 132 | return -1; |
| 133 | if(sendcommand(tag, out, "HELO %s", local_hostname())) |
| 134 | return -1; |
| 135 | if((rc = getresponse(tag, in)) / 100 != 2) |
| 136 | return -1; |
| 137 | if(sendcommand(tag, out, "MAIL FROM:<%s>", sender)) |
| 138 | return -1; |
| 139 | if((rc = getresponse(tag, in)) / 100 != 2) |
| 140 | return -1; |
| 141 | if(sendcommand(tag, out, "RCPT TO:<%s>", recipient)) |
| 142 | return -1; |
| 143 | if((rc = getresponse(tag, in)) / 100 != 2) |
| 144 | return -1; |
| 145 | if(sendcommand(tag, out, "DATA", sender)) |
| 146 | return -1; |
| 147 | if((rc = getresponse(tag, in)) / 100 != 3) |
| 148 | return -1; |
| 149 | if(fprintf(out, "From: %s\r\n", pubsender) < 0 |
| 150 | || fprintf(out, "To: %s\r\n", recipient) < 0 |
| 151 | || fprintf(out, "Subject: %s\r\n", subject) < 0 |
| 152 | || fprintf(out, "Message-ID: <%s@%s>\r\n", id, local_hostname()) < 0 |
| 153 | || fprintf(out, "MIME-Version: 1.0\r\n") < 0 |
| 154 | || fprintf(out, "Content-Type: %s\r\n", content_type) < 0 |
| 155 | || fprintf(out, "Content-Transfer-Encoding: %s\r\n", encoding) < 0 |
| 156 | || fprintf(out, "Date: %s\r\n", date) < 0 |
| 157 | || fprintf(out, "\r\n") < 0) { |
| 158 | write_error: |
| 159 | error(errno, "%s: write error", tag); |
| 160 | return -1; |
| 161 | } |
| 162 | for(ptr = body; *ptr; ++ptr) { |
| 163 | if(sol && *ptr == '.') |
| 164 | if(fputc('.', out) < 0) |
| 165 | goto write_error; |
| 166 | if(*ptr == '\n') { |
| 167 | if(fputc('\r', out) < 0) |
| 168 | goto write_error; |
| 169 | sol = 1; |
| 170 | } else |
| 171 | sol = 0; |
| 172 | if(fputc(*ptr, out) < 0) |
| 173 | goto write_error; |
| 174 | } |
| 175 | if(!sol) |
| 176 | if(fputs("\r\n", out) < 0) |
| 177 | goto write_error; |
| 178 | if(fprintf(out, ".\r\n") < 0 |
| 179 | || fflush(out) < 0) |
| 180 | goto write_error; |
| 181 | if((rc = getresponse(tag, in)) / 100 != 2) |
| 182 | return -1; |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /** @brief Send a mail message |
| 187 | * @param sender Sender address (can be "") |
| 188 | * @param pubsender Visible sender address (must not be "") |
| 189 | * @param recipient Recipient address |
| 190 | * @param subject Subject string |
| 191 | * @param encoding Body encoding |
| 192 | * @param content_type Content-type of body |
| 193 | * @param body Text of body (encoded, but \n for newline) |
| 194 | * @return 0 on success, non-0 on error |
| 195 | * |
| 196 | * See mime_encode_text() for encoding of text bodies. |
| 197 | */ |
| 198 | int sendmail(const char *sender, |
| 199 | const char *pubsender, |
| 200 | const char *recipient, |
| 201 | const char *subject, |
| 202 | const char *encoding, |
| 203 | const char *content_type, |
| 204 | const char *body) { |
| 205 | struct stringlist a; |
| 206 | char *s[2]; |
| 207 | struct addrinfo *ai; |
| 208 | char *tag; |
| 209 | int fdin, fdout, rc; |
| 210 | FILE *in, *out; |
| 211 | |
| 212 | static const struct addrinfo pref = { |
| 213 | 0, |
| 214 | PF_INET, |
| 215 | SOCK_STREAM, |
| 216 | IPPROTO_TCP, |
| 217 | 0, |
| 218 | 0, |
| 219 | 0, |
| 220 | 0 |
| 221 | }; |
| 222 | |
| 223 | /* Find the SMTP server */ |
| 224 | a.n = 2; |
| 225 | a.s = s; |
| 226 | s[0] = config->smtp_server; |
| 227 | s[1] = (char *)"smtp"; |
| 228 | if(!(ai = get_address(&a, &pref, &tag))) |
| 229 | return -1; |
| 230 | fdin = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
| 231 | if(connect(fdin, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 232 | error(errno, "error connecting to %s", tag); |
| 233 | xclose(fdin); |
| 234 | return -1; |
| 235 | } |
| 236 | if((fdout = dup(fdin)) < 0) |
| 237 | fatal(errno, "error calling dup2"); |
| 238 | if(!(in = fdopen(fdin, "rb"))) |
| 239 | fatal(errno, "error calling fdopen"); |
| 240 | if(!(out = fdopen(fdout, "wb"))) |
| 241 | fatal(errno, "error calling fdopen"); |
| 242 | rc = sendmailfp(tag, in, out, sender, pubsender, recipient, subject, |
| 243 | encoding, content_type, body); |
| 244 | fclose(in); |
| 245 | fclose(out); |
| 246 | return rc; |
| 247 | } |
| 248 | |
| 249 | /** @brief Start a subproces to send a mail message |
| 250 | * @param sender Sender address (can be "") |
| 251 | * @param pubsender Visible sender address (must not be "") |
| 252 | * @param recipient Recipient address |
| 253 | * @param subject Subject string |
| 254 | * @param encoding Body encoding |
| 255 | * @param content_type Content-type of body |
| 256 | * @param body Text of body (encoded, but \n for newline) |
| 257 | * @return Subprocess PID on success, -1 on error |
| 258 | */ |
| 259 | pid_t sendmail_subprocess(const char *sender, |
| 260 | const char *pubsender, |
| 261 | const char *recipient, |
| 262 | const char *subject, |
| 263 | const char *encoding, |
| 264 | const char *content_type, |
| 265 | const char *body) { |
| 266 | pid_t pid; |
| 267 | |
| 268 | if(!(pid = fork())) { |
| 269 | exitfn = _exit; |
| 270 | if(sendmail(sender, pubsender, recipient, subject, |
| 271 | encoding, content_type, body)) |
| 272 | _exit(1); |
| 273 | _exit(0); |
| 274 | } |
| 275 | if(pid < 0) |
| 276 | error(errno, "error calling fork"); |
| 277 | return pid; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | Local Variables: |
| 282 | c-basic-offset:2 |
| 283 | comment-column:40 |
| 284 | fill-column:79 |
| 285 | indent-tabs-mode:nil |
| 286 | End: |
| 287 | */ |