| 1 | #include <sys/types.h> |
| 2 | #include <sys/socket.h> |
| 3 | #include <netinet/in.h> |
| 4 | #include <arpa/inet.h> |
| 5 | #include "sig.h" |
| 6 | #include "stralloc.h" |
| 7 | #include "substdio.h" |
| 8 | #include "subfd.h" |
| 9 | #include "scan.h" |
| 10 | #include "case.h" |
| 11 | #include "error.h" |
| 12 | #include "auto_qmail.h" |
| 13 | #include "control.h" |
| 14 | #include "dns.h" |
| 15 | #include "alloc.h" |
| 16 | #include "quote.h" |
| 17 | #include "ip.h" |
| 18 | #include "ipalloc.h" |
| 19 | #include "ipme.h" |
| 20 | #include "gen_alloc.h" |
| 21 | #include "gen_allocdefs.h" |
| 22 | #include "str.h" |
| 23 | #include "now.h" |
| 24 | #include "exit.h" |
| 25 | #include "constmap.h" |
| 26 | #include "tcpto.h" |
| 27 | #include "readwrite.h" |
| 28 | #include "timeoutconn.h" |
| 29 | #include "timeoutread.h" |
| 30 | #include "timeoutwrite.h" |
| 31 | |
| 32 | #define HUGESMTPTEXT 5000 |
| 33 | |
| 34 | #define PORT_SMTP 25 /* silly rabbit, /etc/services is for users */ |
| 35 | unsigned long port = PORT_SMTP; |
| 36 | |
| 37 | GEN_ALLOC_typedef(saa,stralloc,sa,len,a) |
| 38 | GEN_ALLOC_readyplus(saa,stralloc,sa,len,a,i,n,x,10,saa_readyplus) |
| 39 | static stralloc sauninit = {0}; |
| 40 | |
| 41 | stralloc helohost = {0}; |
| 42 | stralloc routes = {0}; |
| 43 | struct constmap maproutes; |
| 44 | stralloc host = {0}; |
| 45 | stralloc sender = {0}; |
| 46 | |
| 47 | saa reciplist = {0}; |
| 48 | |
| 49 | struct ip_address partner; |
| 50 | |
| 51 | void out(s) char *s; { if (substdio_puts(subfdoutsmall,s) == -1) _exit(0); } |
| 52 | void zero() { if (substdio_put(subfdoutsmall,"\0",1) == -1) _exit(0); } |
| 53 | void zerodie() { zero(); substdio_flush(subfdoutsmall); _exit(0); } |
| 54 | void outsafe(sa) stralloc *sa; { int i; char ch; |
| 55 | for (i = 0;i < sa->len;++i) { |
| 56 | ch = sa->s[i]; if (ch < 33) ch = '?'; if (ch > 126) ch = '?'; |
| 57 | if (substdio_put(subfdoutsmall,&ch,1) == -1) _exit(0); } } |
| 58 | |
| 59 | void temp_nomem() { out("ZOut of memory. (#4.3.0)\n"); zerodie(); } |
| 60 | void temp_oserr() { out("Z\ |
| 61 | System resources temporarily unavailable. (#4.3.0)\n"); zerodie(); } |
| 62 | void temp_noconn() { out("Z\ |
| 63 | Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)\n"); zerodie(); } |
| 64 | void temp_read() { out("ZUnable to read message. (#4.3.0)\n"); zerodie(); } |
| 65 | void temp_dnscanon() { out("Z\ |
| 66 | CNAME lookup failed temporarily. (#4.4.3)\n"); zerodie(); } |
| 67 | void temp_dns() { out("Z\ |
| 68 | Sorry, I couldn't find any host by that name. (#4.1.2)\n"); zerodie(); } |
| 69 | void temp_chdir() { out("Z\ |
| 70 | Unable to switch to home directory. (#4.3.0)\n"); zerodie(); } |
| 71 | void temp_control() { out("Z\ |
| 72 | Unable to read control files. (#4.3.0)\n"); zerodie(); } |
| 73 | void perm_partialline() { out("D\ |
| 74 | SMTP cannot transfer messages with partial final lines. (#5.6.2)\n"); zerodie(); } |
| 75 | void perm_usage() { out("D\ |
| 76 | I (qmail-remote) was invoked improperly. (#5.3.5)\n"); zerodie(); } |
| 77 | void perm_dns() { out("D\ |
| 78 | Sorry, I couldn't find any host named "); |
| 79 | outsafe(&host); |
| 80 | out(". (#5.1.2)\n"); zerodie(); } |
| 81 | void perm_nomx() { out("D\ |
| 82 | Sorry, I couldn't find a mail exchanger or IP address. (#5.4.4)\n"); |
| 83 | zerodie(); } |
| 84 | void perm_ambigmx() { out("D\ |
| 85 | Sorry. Although I'm listed as a best-preference MX or A for that host,\n\ |
| 86 | it isn't in my control/locals file, so I don't treat it as local. (#5.4.6)\n"); |
| 87 | zerodie(); } |
| 88 | |
| 89 | void outhost() |
| 90 | { |
| 91 | char x[IPFMT]; |
| 92 | if (substdio_put(subfdoutsmall,x,ip_fmt(x,&partner)) == -1) _exit(0); |
| 93 | } |
| 94 | |
| 95 | int flagcritical = 0; |
| 96 | |
| 97 | void dropped() { |
| 98 | out("ZConnected to "); |
| 99 | outhost(); |
| 100 | out(" but connection died. "); |
| 101 | if (flagcritical) out("Possible duplicate! "); |
| 102 | out("(#4.4.2)\n"); |
| 103 | zerodie(); |
| 104 | } |
| 105 | |
| 106 | int timeoutconnect = 60; |
| 107 | int smtpfd; |
| 108 | int timeout = 1200; |
| 109 | |
| 110 | int saferead(fd,buf,len) int fd; char *buf; int len; |
| 111 | { |
| 112 | int r; |
| 113 | r = timeoutread(timeout,smtpfd,buf,len); |
| 114 | if (r <= 0) dropped(); |
| 115 | return r; |
| 116 | } |
| 117 | int safewrite(fd,buf,len) int fd; char *buf; int len; |
| 118 | { |
| 119 | int r; |
| 120 | r = timeoutwrite(timeout,smtpfd,buf,len); |
| 121 | if (r <= 0) dropped(); |
| 122 | return r; |
| 123 | } |
| 124 | |
| 125 | char inbuf[1024]; |
| 126 | substdio ssin = SUBSTDIO_FDBUF(read,0,inbuf,sizeof inbuf); |
| 127 | char smtptobuf[1024]; |
| 128 | substdio smtpto = SUBSTDIO_FDBUF(safewrite,-1,smtptobuf,sizeof smtptobuf); |
| 129 | char smtpfrombuf[128]; |
| 130 | substdio smtpfrom = SUBSTDIO_FDBUF(saferead,-1,smtpfrombuf,sizeof smtpfrombuf); |
| 131 | |
| 132 | stralloc smtptext = {0}; |
| 133 | |
| 134 | void get(ch) |
| 135 | char *ch; |
| 136 | { |
| 137 | substdio_get(&smtpfrom,ch,1); |
| 138 | if (*ch != '\r') |
| 139 | if (smtptext.len < HUGESMTPTEXT) |
| 140 | if (!stralloc_append(&smtptext,ch)) temp_nomem(); |
| 141 | } |
| 142 | |
| 143 | unsigned long smtpcode() |
| 144 | { |
| 145 | unsigned char ch; |
| 146 | unsigned long code; |
| 147 | |
| 148 | if (!stralloc_copys(&smtptext,"")) temp_nomem(); |
| 149 | |
| 150 | get(&ch); code = ch - '0'; |
| 151 | get(&ch); code = code * 10 + (ch - '0'); |
| 152 | get(&ch); code = code * 10 + (ch - '0'); |
| 153 | for (;;) { |
| 154 | get(&ch); |
| 155 | if (ch != '-') break; |
| 156 | while (ch != '\n') get(&ch); |
| 157 | get(&ch); |
| 158 | get(&ch); |
| 159 | get(&ch); |
| 160 | } |
| 161 | while (ch != '\n') get(&ch); |
| 162 | |
| 163 | return code; |
| 164 | } |
| 165 | |
| 166 | void outsmtptext() |
| 167 | { |
| 168 | int i; |
| 169 | if (smtptext.s) if (smtptext.len) { |
| 170 | out("Remote host said: "); |
| 171 | for (i = 0;i < smtptext.len;++i) |
| 172 | if (!smtptext.s[i]) smtptext.s[i] = '?'; |
| 173 | if (substdio_put(subfdoutsmall,smtptext.s,smtptext.len) == -1) _exit(0); |
| 174 | smtptext.len = 0; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | void quit(prepend,append) |
| 179 | char *prepend; |
| 180 | char *append; |
| 181 | { |
| 182 | substdio_putsflush(&smtpto,"QUIT\r\n"); |
| 183 | /* waiting for remote side is just too ridiculous */ |
| 184 | out(prepend); |
| 185 | outhost(); |
| 186 | out(append); |
| 187 | out(".\n"); |
| 188 | outsmtptext(); |
| 189 | zerodie(); |
| 190 | } |
| 191 | |
| 192 | void blast() |
| 193 | { |
| 194 | int r; |
| 195 | char ch; |
| 196 | |
| 197 | for (;;) { |
| 198 | r = substdio_get(&ssin,&ch,1); |
| 199 | if (r == 0) break; |
| 200 | if (r == -1) temp_read(); |
| 201 | if (ch == '.') |
| 202 | substdio_put(&smtpto,".",1); |
| 203 | while (ch != '\n') { |
| 204 | substdio_put(&smtpto,&ch,1); |
| 205 | r = substdio_get(&ssin,&ch,1); |
| 206 | if (r == 0) perm_partialline(); |
| 207 | if (r == -1) temp_read(); |
| 208 | } |
| 209 | substdio_put(&smtpto,"\r\n",2); |
| 210 | } |
| 211 | |
| 212 | flagcritical = 1; |
| 213 | substdio_put(&smtpto,".\r\n",3); |
| 214 | substdio_flush(&smtpto); |
| 215 | } |
| 216 | |
| 217 | stralloc recip = {0}; |
| 218 | |
| 219 | void smtp() |
| 220 | { |
| 221 | unsigned long code; |
| 222 | int flagbother; |
| 223 | int i; |
| 224 | |
| 225 | if (smtpcode() != 220) quit("ZConnected to "," but greeting failed"); |
| 226 | |
| 227 | substdio_puts(&smtpto,"HELO "); |
| 228 | substdio_put(&smtpto,helohost.s,helohost.len); |
| 229 | substdio_puts(&smtpto,"\r\n"); |
| 230 | substdio_flush(&smtpto); |
| 231 | if (smtpcode() != 250) quit("ZConnected to "," but my name was rejected"); |
| 232 | |
| 233 | substdio_puts(&smtpto,"MAIL FROM:<"); |
| 234 | substdio_put(&smtpto,sender.s,sender.len); |
| 235 | substdio_puts(&smtpto,">\r\n"); |
| 236 | substdio_flush(&smtpto); |
| 237 | code = smtpcode(); |
| 238 | if (code >= 500) quit("DConnected to "," but sender was rejected"); |
| 239 | if (code >= 400) quit("ZConnected to "," but sender was rejected"); |
| 240 | |
| 241 | flagbother = 0; |
| 242 | for (i = 0;i < reciplist.len;++i) { |
| 243 | substdio_puts(&smtpto,"RCPT TO:<"); |
| 244 | substdio_put(&smtpto,reciplist.sa[i].s,reciplist.sa[i].len); |
| 245 | substdio_puts(&smtpto,">\r\n"); |
| 246 | substdio_flush(&smtpto); |
| 247 | code = smtpcode(); |
| 248 | if (code >= 500) { |
| 249 | out("h"); outhost(); out(" does not like recipient.\n"); |
| 250 | outsmtptext(); zero(); |
| 251 | } |
| 252 | else if (code >= 400) { |
| 253 | out("s"); outhost(); out(" does not like recipient.\n"); |
| 254 | outsmtptext(); zero(); |
| 255 | } |
| 256 | else { |
| 257 | out("r"); zero(); |
| 258 | flagbother = 1; |
| 259 | } |
| 260 | } |
| 261 | if (!flagbother) quit("DGiving up on ",""); |
| 262 | |
| 263 | substdio_putsflush(&smtpto,"DATA\r\n"); |
| 264 | code = smtpcode(); |
| 265 | if (code >= 500) quit("D"," failed on DATA command"); |
| 266 | if (code >= 400) quit("Z"," failed on DATA command"); |
| 267 | |
| 268 | blast(); |
| 269 | code = smtpcode(); |
| 270 | flagcritical = 0; |
| 271 | if (code >= 500) quit("D"," failed after I sent the message"); |
| 272 | if (code >= 400) quit("Z"," failed after I sent the message"); |
| 273 | quit("K"," accepted message"); |
| 274 | } |
| 275 | |
| 276 | stralloc canonhost = {0}; |
| 277 | stralloc canonbox = {0}; |
| 278 | |
| 279 | void addrmangle(saout,s,flagalias,flagcname) |
| 280 | stralloc *saout; /* host has to be canonical, box has to be quoted */ |
| 281 | char *s; |
| 282 | int *flagalias; |
| 283 | int flagcname; |
| 284 | { |
| 285 | int j; |
| 286 | |
| 287 | *flagalias = flagcname; |
| 288 | |
| 289 | j = str_rchr(s,'@'); |
| 290 | if (!s[j]) { |
| 291 | if (!stralloc_copys(saout,s)) temp_nomem(); |
| 292 | return; |
| 293 | } |
| 294 | if (!stralloc_copys(&canonbox,s)) temp_nomem(); |
| 295 | canonbox.len = j; |
| 296 | if (!quote(saout,&canonbox)) temp_nomem(); |
| 297 | if (!stralloc_cats(saout,"@")) temp_nomem(); |
| 298 | |
| 299 | if (!stralloc_copys(&canonhost,s + j + 1)) temp_nomem(); |
| 300 | if (flagcname) |
| 301 | switch(dns_cname(&canonhost)) { |
| 302 | case 0: *flagalias = 0; break; |
| 303 | case DNS_MEM: temp_nomem(); |
| 304 | case DNS_SOFT: temp_dnscanon(); |
| 305 | case DNS_HARD: ; /* alias loop, not our problem */ |
| 306 | } |
| 307 | |
| 308 | if (!stralloc_cat(saout,&canonhost)) temp_nomem(); |
| 309 | } |
| 310 | |
| 311 | void getcontrols() |
| 312 | { |
| 313 | if (control_init() == -1) temp_control(); |
| 314 | if (control_readint(&timeout,"control/timeoutremote") == -1) temp_control(); |
| 315 | if (control_readint(&timeoutconnect,"control/timeoutconnect") == -1) |
| 316 | temp_control(); |
| 317 | if (control_rldef(&helohost,"control/helohost",1,(char *) 0) != 1) |
| 318 | temp_control(); |
| 319 | switch(control_readfile(&routes,"control/smtproutes",0)) { |
| 320 | case -1: |
| 321 | temp_control(); |
| 322 | case 0: |
| 323 | if (!constmap_init(&maproutes,"",0,1)) temp_nomem(); break; |
| 324 | case 1: |
| 325 | if (!constmap_init(&maproutes,routes.s,routes.len,1)) temp_nomem(); break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | void main(argc,argv) |
| 330 | int argc; |
| 331 | char **argv; |
| 332 | { |
| 333 | static ipalloc ip = {0}; |
| 334 | int i; |
| 335 | unsigned long random; |
| 336 | char **recips; |
| 337 | unsigned long prefme; |
| 338 | int flagallaliases; |
| 339 | int flagalias; |
| 340 | char *relayhost; |
| 341 | |
| 342 | sig_pipeignore(); |
| 343 | if (argc < 4) perm_usage(); |
| 344 | if (chdir(auto_qmail) == -1) temp_chdir(); |
| 345 | getcontrols(); |
| 346 | |
| 347 | |
| 348 | if (!stralloc_copys(&host,argv[1])) temp_nomem(); |
| 349 | |
| 350 | relayhost = 0; |
| 351 | for (i = 0;i <= host.len;++i) |
| 352 | if ((i == 0) || (i == host.len) || (host.s[i] == '.')) |
| 353 | if (relayhost = constmap(&maproutes,host.s + i,host.len - i)) |
| 354 | break; |
| 355 | if (relayhost && !*relayhost) relayhost = 0; |
| 356 | |
| 357 | if (relayhost) { |
| 358 | i = str_chr(relayhost,':'); |
| 359 | if (relayhost[i]) { |
| 360 | scan_ulong(relayhost + i + 1,&port); |
| 361 | relayhost[i] = 0; |
| 362 | } |
| 363 | if (!stralloc_copys(&host,relayhost)) temp_nomem(); |
| 364 | } |
| 365 | |
| 366 | |
| 367 | addrmangle(&sender,argv[2],&flagalias,0); |
| 368 | |
| 369 | if (!saa_readyplus(&reciplist,0)) temp_nomem(); |
| 370 | if (ipme_init() != 1) temp_oserr(); |
| 371 | |
| 372 | flagallaliases = 1; |
| 373 | recips = argv + 3; |
| 374 | while (*recips) { |
| 375 | if (!saa_readyplus(&reciplist,1)) temp_nomem(); |
| 376 | reciplist.sa[reciplist.len] = sauninit; |
| 377 | addrmangle(reciplist.sa + reciplist.len,*recips,&flagalias,!relayhost); |
| 378 | if (!flagalias) flagallaliases = 0; |
| 379 | ++reciplist.len; |
| 380 | ++recips; |
| 381 | } |
| 382 | |
| 383 | |
| 384 | random = now() + (getpid() << 16); |
| 385 | switch (relayhost ? dns_ip(&ip,&host) : dns_mxip(&ip,&host,random)) { |
| 386 | case DNS_MEM: temp_nomem(); |
| 387 | case DNS_SOFT: temp_dns(); |
| 388 | case DNS_HARD: perm_dns(); |
| 389 | case 1: |
| 390 | if (ip.len <= 0) temp_dns(); |
| 391 | } |
| 392 | |
| 393 | if (ip.len <= 0) perm_nomx(); |
| 394 | |
| 395 | prefme = 100000; |
| 396 | for (i = 0;i < ip.len;++i) |
| 397 | if (ipme_is(&ip.ix[i].ip)) |
| 398 | if (ip.ix[i].pref < prefme) |
| 399 | prefme = ip.ix[i].pref; |
| 400 | |
| 401 | if (relayhost) prefme = 300000; |
| 402 | if (flagallaliases) prefme = 500000; |
| 403 | |
| 404 | for (i = 0;i < ip.len;++i) |
| 405 | if (ip.ix[i].pref < prefme) |
| 406 | break; |
| 407 | |
| 408 | if (i >= ip.len) |
| 409 | perm_ambigmx(); |
| 410 | |
| 411 | for (i = 0;i < ip.len;++i) if (ip.ix[i].pref < prefme) { |
| 412 | if (tcpto(&ip.ix[i].ip)) continue; |
| 413 | |
| 414 | smtpfd = socket(AF_INET,SOCK_STREAM,0); |
| 415 | if (smtpfd == -1) temp_oserr(); |
| 416 | |
| 417 | if (timeoutconn(smtpfd,&ip.ix[i].ip,(unsigned int) port,timeoutconnect) == 0) { |
| 418 | tcpto_err(&ip.ix[i].ip,0); |
| 419 | partner = ip.ix[i].ip; |
| 420 | smtp(); /* does not return */ |
| 421 | } |
| 422 | tcpto_err(&ip.ix[i].ip,errno == error_timeout); |
| 423 | close(smtpfd); |
| 424 | } |
| 425 | |
| 426 | temp_noconn(); |
| 427 | } |