qmail-postgrey.c

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#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "stralloc.h"
#include "logmsg.h"
#include "ip.h"
#include "case.h"
#include "str.h"
#include "exit.h"
#include "scan.h"
#include "timeout.h"
#include "timeoutconn.h"
#include "socket_if.h"
 
#define WHO "qmail-postgrey"
 
#define CT 10 /* Connect timeout */
#define WT 10 /* Write timeout   */
#define RT 10 /* Read timeout    */
 
unsigned int port = 60000; /* default port */
 
int main(int argc,char * const *argv)
{
  struct ip4_address ip4;
  struct ip6_address ip6;
  stralloc query = {0};
  char buf[64];
  char *remoteip = 0;
  char *netif = 0;
  uint32 ifidx = 0;
  int pgfd;
  int i, j, r;
 
  if (argc != 6)
    logmsg(WHO,100,USAGE,"qmail-postgrey ip%ifidx;port sender recipient client_address client_name");
 
  remoteip = argv[1];
  i = str_chr(remoteip,':');
  if (remoteip[i] == ':') {
    j = str_chr(remoteip,'%');                                   /* IF index */
    if (remoteip[j] == '%') {
      remoteip[j] = 0;
      netif = &remoteip[j + 1];
      ifidx = socket_getifidx(netif);
    }
    if (!ip6_scan(remoteip,(char *)&ip6.d)) 
      logmsg(WHO,111,FATAL,B("No valid IPv6 address provided: ",remoteip));
    pgfd = socket(AF_INET6,SOCK_STREAM,0);
    if (pgfd == -1) 
      logmsg(WHO,111,FATAL,"Can't bind to IPv6 socket.");
    r = timeoutconn6(pgfd,(char *)&ip6.d,port,CT,ifidx);
  } else {
    if (!ip4_scan(remoteip,(char *)&ip4.d)) 
      logmsg(WHO,111,FATAL,B("No valid IPv6 address provided: ",remoteip));
    pgfd = socket(AF_INET,SOCK_STREAM,0);
    if (pgfd == -1) 
      logmsg(WHO,111,FATAL,"Can't bind to IPv4 socket.");
    r = timeoutconn4(pgfd,(char *)&ip4.d,port,CT);
  }
  if (r != 0) {
    if (errno == ETIMEDOUT) 
    close(pgfd);
    logmsg(WHO,111,FATAL,B("Can't communicate with postgrey server: ",remoteip));
    _exit(1);
  }
 
  /* Provide SMTP connect vector to postgrey server */
 
  if (!stralloc_copys(&query,"request=smtpd_access_policy\nclient_address=")) _exit(1);
  if (!stralloc_cats(&query,argv[4])) _exit(1);
  if (!stralloc_cats(&query,"\nclient_name=")) _exit(1);
  if (!stralloc_cats(&query,argv[5])) _exit(1);
  if (!stralloc_cats(&query,"\nsender=")) _exit(1);
  if (!stralloc_cats(&query,argv[2])) _exit(1);
  if (!stralloc_cats(&query,"\nrecipient=")) _exit(1);
  if (!stralloc_cats(&query,argv[3])) _exit(1);
  if (!stralloc_cats(&query,"\n\n")) _exit(1);
 
  do {
     r = timeoutwrite(WT,pgfd,query.s,query.len);
  } while (r == -1 && errno == EINTR);
 
  if (r != query.len) { close(pgfd); _exit(1); }
 
  /* Read response */
 
  do {
    r = timeoutread(RT,pgfd,buf,sizeof(buf));
  } while (r == -1 && errno == EINTR);
 
  if (r == -1) { close(pgfd); _exit(1); }
  close(pgfd);
 
//  logmsg(WHO,0,INFO,buf);
 
  if (r >= 12)
    if (!case_diffb(buf,12,"action=dunno")) _exit(0);
  if (r >= 14)
    if (!case_diffb(buf,14,"action=prepend")) _exit(0);
  if (r >= 22)
    if (!case_diffb(buf,22,"action=defer_if_permit")) _exit(10);
 
  exit(1);
}