2 #include <sys/socket.h>
3 #include <netinet/in.h>
12 #include "auto_qmail.h"
20 #include "gen_alloc.h"
21 #include "gen_allocdefs.h"
27 #include "readwrite.h"
28 #include "timeoutconn.h"
29 #include "timeoutread.h"
30 #include "timeoutwrite.h"
32 #define HUGESMTPTEXT 5000
34 #define PORT_SMTP 25 /* silly rabbit, /etc/services is for users */
35 unsigned long port = PORT_SMTP;
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};
41 stralloc helohost = {0};
42 stralloc routes = {0};
43 struct constmap maproutes;
45 stralloc sender = {0};
49 struct ip_address partner;
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); } }
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 ");
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");
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");
92 if (substdio_put(subfdoutsmall,x,ip_fmt(x,&partner)) == -1) _exit(0);
98 out("ZConnected to ");
100 out(" but connection died. ");
101 if (flagcritical) out("Possible duplicate! ");
106 int timeoutconnect = 60;
110 int saferead(fd,buf,len) int fd; char *buf; int len;
113 r = timeoutread(timeout,smtpfd,buf,len);
114 if (r <= 0) dropped();
117 int safewrite(fd,buf,len) int fd; char *buf; int len;
120 r = timeoutwrite(timeout,smtpfd,buf,len);
121 if (r <= 0) dropped();
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);
132 stralloc smtptext = {0};
137 substdio_get(&smtpfrom,ch,1);
139 if (smtptext.len < HUGESMTPTEXT)
140 if (!stralloc_append(&smtptext,ch)) temp_nomem();
143 unsigned long smtpcode()
148 if (!stralloc_copys(&smtptext,"")) temp_nomem();
150 get(&ch); code = ch - '0';
151 get(&ch); code = code * 10 + (ch - '0');
152 get(&ch); code = code * 10 + (ch - '0');
155 if (ch != '-') break;
156 while (ch != '\n') get(&ch);
161 while (ch != '\n') get(&ch);
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);
178 void quit(prepend,append)
182 substdio_putsflush(&smtpto,"QUIT\r\n");
183 /* waiting for remote side is just too ridiculous */
192 stralloc verh = {0}; /* quoted recipient */
193 int flagverh; /* argc */
194 char *vp; /* argv[3] */
198 unsigned int posat, i;
199 int flagdobody,flagheader;
203 posat = 0; /* stays 0 if no VERH */
204 flagdobody = 0; /* => 0 at first blank line */
206 if (flagverh == 4) { /* only if single recipient */
207 if (!quote2(&verh,vp)) temp_nomem(); /* non-canonicalized */
208 for (i = 0; i < verh.len; i++) /* \n would destroy message */
209 if (verh.s[i] == '\n') verh.s[i] = '_';
210 posat = byte_rchr(verh.s,verh.len,'@'); /* posat=0 if no VERH */
211 if (posat == verh.len) posat = 0;
214 r = substdio_get(&ssin,&ch,1);
216 if (r == -1) temp_read();
218 substdio_put(&smtpto,".",1);
220 if (ch == '\n') { /* header ends */
222 if (!flagdobody) posat = 0;
223 } else if (ch == '#') { /* # starting line => VERH ... */
224 flagdobody = 1; /* continues in body and ... */
225 continue; /* character is suppressed. */
229 if (ch == '#' && posat) { /* ... # */
230 r = substdio_get(&ssin,&ch,1);
231 if (r == 0) perm_partialline();
232 if (r == -1) temp_read();
233 if (ch == '#') { /* ... ## */
235 ch1 = *substdio_peek(&ssin);
236 if (ch1 != 'L' && ch1 != 'H') { /* ... ##x x!=L x!=H */
237 substdio_put(&smtpto,"#",1);
240 r = substdio_get(&ssin,&ch,1);
241 if (r == 0) perm_partialline();
242 if (r == -1) temp_read();
243 if (ch == 'L') /* ... ##L */
244 substdio_put(&smtpto,verh.s,posat);
246 substdio_put(&smtpto,verh.s + posat + 1,verh.len - posat - 1);
248 substdio_put(&smtpto,"#",1);
249 if (ch == '\n') break;
250 substdio_put(&smtpto,&ch,1);
253 substdio_put(&smtpto,&ch,1);
254 r = substdio_get(&ssin,&ch,1);
255 if (r == 0) perm_partialline();
256 if (r == -1) temp_read();
258 substdio_put(&smtpto,"\r\n",2);
262 substdio_put(&smtpto,".\r\n",3);
263 substdio_flush(&smtpto);
266 stralloc recip = {0};
274 if (smtpcode() != 220) quit("ZConnected to "," but greeting failed");
276 substdio_puts(&smtpto,"HELO ");
277 substdio_put(&smtpto,helohost.s,helohost.len);
278 substdio_puts(&smtpto,"\r\n");
279 substdio_flush(&smtpto);
280 if (smtpcode() != 250) quit("ZConnected to "," but my name was rejected");
282 substdio_puts(&smtpto,"MAIL FROM:<");
283 substdio_put(&smtpto,sender.s,sender.len);
284 substdio_puts(&smtpto,">\r\n");
285 substdio_flush(&smtpto);
287 if (code >= 500) quit("DConnected to "," but sender was rejected");
288 if (code >= 400) quit("ZConnected to "," but sender was rejected");
291 for (i = 0;i < reciplist.len;++i) {
292 substdio_puts(&smtpto,"RCPT TO:<");
293 substdio_put(&smtpto,reciplist.sa[i].s,reciplist.sa[i].len);
294 substdio_puts(&smtpto,">\r\n");
295 substdio_flush(&smtpto);
298 out("h"); outhost(); out(" does not like recipient.\n");
299 outsmtptext(); zero();
301 else if (code >= 400) {
302 out("s"); outhost(); out(" does not like recipient.\n");
303 outsmtptext(); zero();
310 if (!flagbother) quit("DGiving up on ","");
312 substdio_putsflush(&smtpto,"DATA\r\n");
314 if (code >= 500) quit("D"," failed on DATA command");
315 if (code >= 400) quit("Z"," failed on DATA command");
320 if (code >= 500) quit("D"," failed after I sent the message");
321 if (code >= 400) quit("Z"," failed after I sent the message");
322 quit("K"," accepted message");
325 stralloc canonhost = {0};
326 stralloc canonbox = {0};
328 void addrmangle(saout,s,flagalias,flagcname)
329 stralloc *saout; /* host has to be canonical, box has to be quoted */
336 *flagalias = flagcname;
340 if (!stralloc_copys(saout,s)) temp_nomem();
343 if (!stralloc_copys(&canonbox,s)) temp_nomem();
345 if (!quote(saout,&canonbox)) temp_nomem();
346 if (!stralloc_cats(saout,"@")) temp_nomem();
348 if (!stralloc_copys(&canonhost,s + j + 1)) temp_nomem();
350 switch(dns_cname(&canonhost)) {
351 case 0: *flagalias = 0; break;
352 case DNS_MEM: temp_nomem();
353 case DNS_SOFT: temp_dnscanon();
354 case DNS_HARD: ; /* alias loop, not our problem */
357 if (!stralloc_cat(saout,&canonhost)) temp_nomem();
362 if (control_init() == -1) temp_control();
363 if (control_readint(&timeout,"control/timeoutremote") == -1) temp_control();
364 if (control_readint(&timeoutconnect,"control/timeoutconnect") == -1)
366 if (control_rldef(&helohost,"control/helohost",1,(char *) 0) != 1)
368 switch(control_readfile(&routes,"control/smtproutes",0)) {
372 if (!constmap_init(&maproutes,"",0,1)) temp_nomem(); break;
374 if (!constmap_init(&maproutes,routes.s,routes.len,1)) temp_nomem(); break;
382 static ipalloc ip = {0};
384 unsigned long random;
386 unsigned long prefme;
392 if (argc < 4) perm_usage();
395 if (chdir(auto_qmail) == -1) temp_chdir();
399 if (!stralloc_copys(&host,argv[1])) temp_nomem();
402 for (i = 0;i <= host.len;++i)
403 if ((i == 0) || (i == host.len) || (host.s[i] == '.'))
404 if (relayhost = constmap(&maproutes,host.s + i,host.len - i))
406 if (relayhost && !*relayhost) relayhost = 0;
409 i = str_chr(relayhost,':');
411 scan_ulong(relayhost + i + 1,&port);
414 if (!stralloc_copys(&host,relayhost)) temp_nomem();
418 addrmangle(&sender,argv[2],&flagalias,0);
420 if (!saa_readyplus(&reciplist,0)) temp_nomem();
421 if (ipme_init() != 1) temp_oserr();
426 if (!saa_readyplus(&reciplist,1)) temp_nomem();
427 reciplist.sa[reciplist.len] = sauninit;
428 addrmangle(reciplist.sa + reciplist.len,*recips,&flagalias,!relayhost);
429 if (!flagalias) flagallaliases = 0;
435 random = now() + (getpid() << 16);
436 switch (relayhost ? dns_ip(&ip,&host) : dns_mxip(&ip,&host,random)) {
437 case DNS_MEM: temp_nomem();
438 case DNS_SOFT: temp_dns();
439 case DNS_HARD: perm_dns();
441 if (ip.len <= 0) temp_dns();
444 if (ip.len <= 0) perm_nomx();
447 for (i = 0;i < ip.len;++i)
448 if (ipme_is(&ip.ix[i].ip))
449 if (ip.ix[i].pref < prefme)
450 prefme = ip.ix[i].pref;
452 if (relayhost) prefme = 300000;
453 if (flagallaliases) prefme = 500000;
455 for (i = 0;i < ip.len;++i)
456 if (ip.ix[i].pref < prefme)
462 for (i = 0;i < ip.len;++i) if (ip.ix[i].pref < prefme) {
463 if (tcpto(&ip.ix[i].ip)) continue;
465 smtpfd = socket(AF_INET,SOCK_STREAM,0);
466 if (smtpfd == -1) temp_oserr();
468 if (timeoutconn(smtpfd,&ip.ix[i].ip,(unsigned int) port,timeoutconnect) == 0) {
469 tcpto_err(&ip.ix[i].ip,0);
470 partner = ip.ix[i].ip;
471 smtp(); /* does not return */
473 tcpto_err(&ip.ix[i].ip,errno == error_timeout);