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- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include "sig.h"
- #include "getln.h"
- #include "stralloc.h"
- #include "substdio.h"
- #include "subfd.h"
- #include "scan.h"
- #include "case.h"
- #include "error.h"
- #include "auto_qmail.h"
- #include "control.h"
- #include "dns.h"
- #include "alloc.h"
- #include "quote.h"
- #include "ip.h"
- #include "ipalloc.h"
- #include "ipme.h"
- #include "gen_alloc.h"
- #include "gen_allocdefs.h"
- #include "str.h"
- #include "now.h"
- #include "exit.h"
- #include "constmap.h"
- #include "tcpto.h"
- #include "timeoutconn.h"
- #include "timeoutread.h"
- #include "timeoutwrite.h"
-
- #define HUGESMTPTEXT 5000
-
- #define PORT_SMTP 25 /* silly rabbit, /etc/services is for users */
- unsigned long port = PORT_SMTP;
-
- GEN_ALLOC_typedef(saa,stralloc,sa,len,a)
- GEN_ALLOC_readyplus(saa,stralloc,sa,len,a,i,n,x,10,saa_readyplus)
- static stralloc sauninit = {0};
-
- stralloc helohost = {0};
- stralloc routes = {0};
- struct constmap maproutes;
- stralloc routesip = {0};
- struct constmap maproutesip;
- stralloc host = {0};
- stralloc sender = {0};
-
- saa reciplist = {0};
-
- struct ip_address partner;
-
- void out(s) char *s; { if (substdio_puts(subfdout,s) == -1) _exit(0); }
- void zero() { if (substdio_put(subfdout,"\0",1) == -1) _exit(0); }
- void zerodie() { zero(); substdio_flush(subfdout); _exit(0); }
-
- void outsafe(sa) stralloc *sa; { int i; char ch;
- for (i = 0;i < sa->len;++i) {
- ch = sa->s[i]; if (ch < 33) ch = '?'; if (ch > 126) ch = '?';
- if (substdio_put(subfdout,&ch,1) == -1) _exit(0); } }
-
- void temp_nomem() { out("ZOut of memory. (#4.3.0)\n"); zerodie(); }
- void temp_oserr() { out("Z\
- System resources temporarily unavailable. (#4.3.0)\n"); zerodie(); }
- void temp_noconn() { out("Z\
- Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)\n"); zerodie(); }
- void temp_read() { out("ZUnable to read message. (#4.3.0)\n"); zerodie(); }
- char *addrtype;
- void temp_dnscanon() { out("Z"); out(addrtype); out(" \
- CNAME lookup failed temporarily. (#4.4.3)\n"); zerodie(); }
- void temp_dns() { out("Z\
- Sorry, I couldn't find any host by that name. (#4.1.2)\n"); zerodie(); }
- void temp_chdir() { out("Z\
- Unable to switch to home directory. (#4.3.0)\n"); zerodie(); }
- void temp_control() { out("Z\
- Unable to read control files. (#4.3.0)\n"); zerodie(); }
- void perm_partialline() { out("D\
- SMTP cannot transfer messages with partial final lines. (#5.6.2)\n"); zerodie(); }
- void perm_usage() { out("D\
- I (qmail-remote) was invoked improperly. (#5.3.5)\n"); zerodie(); }
- void perm_dns() { out("D\
- Sorry, I couldn't find any host named ");
- outsafe(&host);
- out(". (#5.1.2)\n"); zerodie(); }
- void perm_nomx() { out("D\
- Sorry, I couldn't find a mail exchanger or IP address. (#5.4.4)\n");
- zerodie(); }
- void perm_ambigmx() { out("D\
- Sorry. Although I'm listed as a best-preference MX or A for that host,\n\
- it isn't in my control/locals file, so I don't treat it as local. (#5.4.6)\n");
- zerodie(); }
-
- int timeout = 1200;
- int timeoutconnect = 60;
-
- void getcontrols()
- {
- int r;
- if (control_init() == -1)
- { if (errno == error_nomem) temp_nomem(); temp_control(); }
-
- if (control_readint(&timeout,"control/timeoutremote") == -1)
- { if (errno == error_nomem) temp_nomem(); temp_control(); }
- if (control_readint(&timeoutconnect,"control/timeoutconnect") == -1)
- { if (errno == error_nomem) temp_nomem(); temp_control(); }
-
- r = control_rldef(&helohost,"control/helohost",1,(char *) 0);
- if (r == -1) if (errno == error_nomem) temp_nomem();
- if (r != 1) temp_control();
-
- switch(control_readfile(&routes,"control/smtproutes",0))
- {
- case -1:
- if (errno == error_nomem) temp_nomem(); temp_control();
- case 0:
- if (!constmap_init(&maproutes,"",0,1)) temp_nomem(); break;
- case 1:
- if (!constmap_init(&maproutes,routes.s,routes.len,1)) temp_nomem(); break;
- }
-
- switch(control_readfile(&routesip,"control/smtproutesip",0))
- {
- case -1:
- if (errno == error_nomem) temp_nomem(); temp_control();
- case 0:
- if (!constmap_init(&maproutesip,"",0,1)) temp_nomem(); break;
- case 1:
- if (!constmap_init(&maproutesip,routesip.s,routesip.len,1)) temp_nomem(); break;
- }
- }
-
- char smtptobuf[1024];
- char smtpfrombuf[128];
- stralloc smtpline = {0};
- stralloc smtptext = {0};
-
- void outsmtptext()
- {
- int i;
- if (smtptext.s) if (smtptext.len) if (smtptext.len < HUGESMTPTEXT)
- {
- if (substdio_puts(subfdout,"Remote host said: ") == -1) _exit(0);
- for (i = 0;i < smtptext.len;++i)
- if (!smtptext.s[i]) smtptext.s[i] = '?';
- if (substdio_put(subfdout,smtptext.s,smtptext.len) == -1) _exit(0);
- smtptext.len = 0;
- }
- }
-
- unsigned long smtpcode(ss)
- substdio *ss;
- {
- int match;
- unsigned long code;
-
- if (!stralloc_copys(&smtptext,"")) return 421;
- do
- {
- if (getln(ss,&smtpline,&match,'\n') != 0) return 421;
- if (!match) return 421;
- if ((smtpline.len >= 2) && (smtpline.s[smtpline.len - 2] == '\r'))
- {
- smtpline.s[smtpline.len - 2] = '\n';
- --smtpline.len;
- }
- if (!stralloc_cat(&smtptext,&smtpline)) return 421;
- if (scan_nbblong(smtpline.s,smtpline.len,10,0,&code) != 3) return 421;
- if (smtpline.len == 3) return code;
- }
- while (smtpline.s[3] == '-');
-
- return code;
- }
-
- void outhost()
- {
- char x[IPFMT];
-
- x[ip_fmt(x,&partner)] = 0;
- out(x);
- }
-
- void writeerr()
- {
- out("ZConnected to "); outhost();
- out(" but communications failed. (#4.4.2)\n");
- zerodie();
- }
-
- void quit(ssto,ssfrom)
- substdio *ssto;
- substdio *ssfrom;
- {
- outsmtptext();
- if (substdio_putsflush(ssto,"QUIT\r\n") != -1)
- smtpcode(ssfrom); /* protocol design stupidity */
- zerodie();
- }
-
- stralloc dataline = {0};
-
- void blast(ssto,ssfrom)
- substdio *ssto;
- substdio *ssfrom;
- {
- int match;
-
- for (;;)
- {
- if (getln(ssfrom,&dataline,&match,'\n') != 0) temp_read();
- if (!match && !dataline.len) break;
- if (!match) perm_partialline();
- --dataline.len;
- if (dataline.len && (dataline.s[0] == '.'))
- if (substdio_put(ssto,".",1) == -1) writeerr();
- if (substdio_put(ssto,dataline.s,dataline.len) == -1) writeerr();
- if (substdio_put(ssto,"\r\n",2) == -1) writeerr();
- }
- if (substdio_put(ssto,".\r\n",3) == -1) writeerr();
- if (substdio_flush(ssto) == -1) writeerr();
- }
-
- stralloc recip = {0};
-
- void smtp(fd)
- int fd;
- {
- substdio ssto;
- substdio ssfrom;
- unsigned long code;
- int flaganyrecipok;
- int i;
-
- substdio_fdbuf(&ssto,timeoutwrite,TIMEOUTWRITE(timeout,fd),smtptobuf,sizeof(smtptobuf));
- substdio_fdbuf(&ssfrom,timeoutread,TIMEOUTREAD(timeout,fd),smtpfrombuf,sizeof(smtpfrombuf));
-
- if (smtpcode(&ssfrom) != 220)
- {
- out("ZConnected to "); outhost(); out(" but greeting failed.\n");
- quit(&ssto,&ssfrom);
- }
-
- if (substdio_puts(&ssto,"HELO ") == -1) writeerr();
- if (substdio_put(&ssto,helohost.s,helohost.len) == -1) writeerr();
- if (substdio_puts(&ssto,"\r\n") == -1) writeerr();
- if (substdio_flush(&ssto) == -1) writeerr();
-
- if (smtpcode(&ssfrom) != 250)
- {
- out("ZConnected to "); outhost(); out(" but my name was rejected.\n");
- quit(&ssto,&ssfrom);
- }
-
- if (substdio_puts(&ssto,"MAIL FROM:<") == -1) writeerr();
- if (substdio_put(&ssto,sender.s,sender.len) == -1) writeerr();
- if (substdio_puts(&ssto,">\r\n") == -1) writeerr();
- if (substdio_flush(&ssto) == -1) writeerr();
-
- code = smtpcode(&ssfrom);
- if (code >= 500)
- {
- out("DConnected to "); outhost(); out(" but sender was rejected.\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 400)
- {
- out("ZConnected to "); outhost(); out(" but sender was rejected.\n");
- quit(&ssto,&ssfrom);
- }
-
- flaganyrecipok = 0;
- for (i = 0;i < reciplist.len;++i)
- {
- if (substdio_puts(&ssto,"RCPT TO:<") == -1) writeerr();
- if (substdio_put(&ssto,reciplist.sa[i].s,reciplist.sa[i].len) == -1) writeerr();
- if (substdio_puts(&ssto,">\r\n") == -1) writeerr();
- if (substdio_flush(&ssto) == -1) writeerr();
-
- code = smtpcode(&ssfrom);
- if (code == 421)
- {
- out("ZConnected to "); outhost(); out(" but connection died.\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 500)
- {
- out("h"); outhost(); out(" does not like recipient.\n");
- outsmtptext(); zero();
- }
- else if (code >= 400)
- {
- out("s"); outhost(); out(" does not like recipient.\n");
- outsmtptext(); zero();
- }
- else
- {
- out("r"); zero();
- flaganyrecipok = 1;
- }
- }
-
- if (!flaganyrecipok)
- {
- out("DGiving up.\n");
- quit(&ssto,&ssfrom);
- }
-
- if (substdio_putsflush(&ssto,"DATA\r\n") == -1) writeerr();
-
- code = smtpcode(&ssfrom);
- if (code == 421)
- {
- out("ZConnected to "); outhost(); out(" but connection died.\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 500)
- {
- out("D"); outhost(); out(" failed on DATA command.\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 400)
- {
- out("Z"); outhost(); out(" failed on DATA command.\n");
- quit(&ssto,&ssfrom);
- }
-
- blast(&ssto,subfdin);
-
- code = smtpcode(&ssfrom);
- if (code == 421)
- {
- out("ZConnected to "); outhost(); out(" but connection died. Possible duplicate!\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 500)
- {
- out("D"); outhost(); out(" failed after I sent the message.\n");
- quit(&ssto,&ssfrom);
- }
- if (code >= 400)
- {
- out("Z"); outhost(); out(" failed after I sent the message.\n");
- quit(&ssto,&ssfrom);
- }
-
- out("K"); outhost(); out(" accepted message.\n");
- quit(&ssto,&ssfrom);
- }
-
- stralloc canonhost = {0};
- stralloc canonbox = {0};
-
- void addrmangle(saout,s,flagalias,flagcname)
- stralloc *saout; /* host has to be canonical, box has to be quoted */
- char *s;
- int *flagalias;
- int flagcname;
- {
- int j;
-
- *flagalias = flagcname;
-
- j = str_rchr(s,'@');
- if (!s[j])
- {
- if (!stralloc_copys(saout,s)) temp_nomem();
- return;
- }
- if (!stralloc_copys(&canonbox,s)) temp_nomem();
- canonbox.len = j;
- if (!quote(saout,&canonbox)) temp_nomem();
- if (!stralloc_cats(saout,"@")) temp_nomem();
-
- if (!stralloc_copys(&canonhost,s + j + 1)) temp_nomem();
- if (flagcname)
- switch(dns_cname(&canonhost))
- {
- case 0: *flagalias = 0; break;
- case DNS_MEM: temp_nomem();
- case DNS_SOFT: temp_dnscanon();
- case DNS_HARD: ; /* alias loop, not our problem */
- }
-
- if (!stralloc_cat(saout,&canonhost)) temp_nomem();
- }
-
- void main(argc,argv)
- int argc;
- char **argv;
- {
- static ipalloc ip = {0};
- int i;
- unsigned long random;
- char **recips;
- unsigned long prefme;
- int flagallaliases;
- int flagalias;
- char *relayhost;
-
- sig_pipeignore();
- if (argc < 4) perm_usage();
- if (chdir(auto_qmail) == -1) temp_chdir();
- getcontrols();
-
-
- if (!stralloc_copys(&host,argv[1])) temp_nomem();
-
- relayhost = 0;
- for (i = 0;i <= host.len;++i)
- if ((i == 0) || (i == host.len) || (host.s[i] == '.'))
- if (relayhost = constmap(&maproutes,host.s + i,host.len - i))
- break;
- if (relayhost && !*relayhost) relayhost = 0;
-
- if (relayhost)
- {
- i = str_chr(relayhost,':');
- if (relayhost[i])
- {
- scan_ulong(relayhost + i + 1,&port);
- relayhost[i] = 0;
- }
- if (!stralloc_copys(&host,relayhost)) temp_nomem();
- }
-
-
- addrtype = "Sender";
- addrmangle(&sender,argv[2],&flagalias,!relayhost);
-
- if (!saa_readyplus(&reciplist,0)) temp_nomem();
- if (ipme_init() != 1) temp_oserr();
-
- addrtype = "Recipient";
- flagallaliases = 1;
- recips = argv + 3;
- while (*recips)
- {
- if (!saa_readyplus(&reciplist,1)) temp_nomem();
- reciplist.sa[reciplist.len] = sauninit;
- addrmangle(reciplist.sa + reciplist.len,*recips,&flagalias,!relayhost);
- if (!flagalias) flagallaliases = 0;
- ++reciplist.len;
- ++recips;
- }
-
-
- random = now() + (getpid() << 16);
- switch (relayhost ? dns_ip(&ip,&host) : dns_mxip(&ip,&host,random))
- {
- case DNS_MEM: temp_nomem();
- case DNS_SOFT: temp_dns();
- case DNS_HARD: perm_dns();
- case 1:
- if (ip.len <= 0) temp_dns();
- }
-
- if (ip.len <= 0) perm_nomx();
-
- prefme = 100000;
- for (i = 0;i < ip.len;++i)
- if (ipme_is(&ip.ix[i].ip))
- if (ip.ix[i].pref < prefme)
- prefme = ip.ix[i].pref;
-
- if (relayhost) prefme = 300000;
- if (flagallaliases) prefme = 500000;
-
- for (i = 0;i < ip.len;++i)
- if (ip.ix[i].pref < prefme)
- break;
-
- if (i >= ip.len)
- perm_ambigmx();
-
- for (i = 0;i < ip.len;++i) if (ip.ix[i].pref < prefme)
- {
- int s;
-
- /* Map IP numbers according to control/smtproutesip. */
- unsigned int j;
- int len;
- char hostip[16]; /* Enough to hold xxx.xxx.xxx.xxx */
- ipalloc ip2 = {0};
- stralloc host2 = {0};
- char *relayhost2 = 0;
- unsigned long connport = port, port2 = port;
-
- hostip[len = ip_fmt (hostip,&ip.ix[i].ip)] = '\0';
-
- for (j = len; (signed int) j > -1; j --)
- if ((j == len) || (j == 0) || (hostip[j - 1] == '.'))
- if ((relayhost2 = constmap (&maproutesip, hostip, j)))
- break;
- if (relayhost2 && !*relayhost2) relayhost2 = 0;
-
- if (relayhost2)
- {
- j = str_chr(relayhost2,':');
- if (relayhost2[j])
- {
- scan_ulong(relayhost2 + j + 1,&port2);
- relayhost2[j] = 0;
- }
- if (!stralloc_copys(&host2,relayhost2)) temp_nomem();
-
- switch (dns_ip (&ip2, &host2))
- {
- case DNS_HARD: break;
- case DNS_SOFT: temp_dns ();
- case DNS_MEM: temp_nomem ();
- case 1:
- if (ip2.len <= 0) temp_dns();
- }
-
- ip.ix[i].ip = ip2.ix[0].ip;
- connport = port2;
- if (!stralloc_copy(&host,&host2)) temp_nomem ();
- }
-
- if (tcpto(&ip.ix[i].ip)) continue;
-
- s = socket(AF_INET,SOCK_STREAM,0);
- if (s == -1) temp_oserr();
-
- if (timeoutconn(s,&ip.ix[i].ip, connport,timeoutconnect) == 0)
- {
- tcpto_err(&ip.ix[i].ip,0);
- partner = ip.ix[i].ip;
- smtp(s); /* does not return */
- }
- tcpto_err(&ip.ix[i].ip,errno == error_timeout);
- close(s);
- }
-
- temp_noconn();
- }
-