mdw@git.distorted.org.uk Git - qmail/blob - remoteinfo.c

   1 #include <sys/types.h>
   2 #include <sys/socket.h>
   3 #include <netinet/in.h>
   4 #include <fcntl.h>
   5 #include "byte.h"
   6 #include "substdio.h"
   7 #include "ip.h"
   8 #include "fmt.h"
   9 #include "timeoutconn.h"
  10 #include "timeoutread.h"
  11 #include "timeoutwrite.h"
  12 #include "remoteinfo.h"
  13
  14 static char line[999];
  15
  16 char *remoteinfo_get(ipr,rp,ipl,lp,timeout)
  17 struct ip_address *ipr;
  18 unsigned long rp;
  19 struct ip_address *ipl;
  20 unsigned long lp;
  21 int timeout;
  22 {
  23   char *x;
  24   int s;
  25   struct sockaddr_in sin;
  26   substdio ss;
  27   char buf[32];
  28   unsigned int len;
  29   int numcolons;
  30   char ch;
  31
  32   s = socket(AF_INET,SOCK_STREAM,0);
  33   if (s == -1) return 0;
  34
  35   byte_zero(&sin,sizeof(sin));
  36   sin.sin_family = AF_INET;
  37   byte_copy(&sin.sin_addr,4,ipl);
  38   sin.sin_port = 0;
  39   if (bind(s,(struct sockaddr *) &sin,sizeof(sin)) == -1) { close(s); return 0; }
  40   if (timeoutconn(s,ipr,113,timeout) == -1) { close(s); return 0; }
  41   fcntl(s,F_SETFL,fcntl(s,F_GETFL,0) & ~O_NDELAY);
  42
  43   len = 0;
  44   len += fmt_ulong(line + len,rp);
  45   len += fmt_str(line + len," , ");
  46   len += fmt_ulong(line + len,lp);
  47   len += fmt_str(line + len,"\r\n");
  48
  49   substdio_fdbuf(&ss,timeoutwrite,TIMEOUTWRITE(timeout,s),buf,sizeof(buf));
  50   if (substdio_putflush(&ss,line,len) == -1) { close(s); return 0; }
  51
  52   substdio_fdbuf(&ss,timeoutread,TIMEOUTREAD(timeout,s),buf,sizeof(buf));
  53   x = line;
  54   numcolons = 0;
  55   for (;;) {
  56     if (substdio_get(&ss,&ch,1) != 1) { close(s); return 0; }
  57     if ((ch == ' ') || (ch == '\t') || (ch == '\r')) continue;
  58     if (ch == '\n') break;
  59     if (numcolons < 3) { if (ch == ':') ++numcolons; }
  60     else { *x++ = ch; if (x == line + sizeof(line) - 1) break; }
  61   }
  62   *x = 0;
  63   close(s);
  64   return line;
  65 }