proxyscan/proxyscanconnect.c

   1 /* proxyscanconnect: handle connections etc. */
   2
   3 #include "proxyscan.h"
   4 #include <stdlib.h>
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7 #include <netinet/in.h>
   8 #include <errno.h>
   9 #include "../core/error.h"
  10 #include <sys/ioctl.h>
  11 #include <string.h>
  12
  13 int createconnectsocket(long ip, int socknum) {
  14   int fd;
  15   struct sockaddr_in sin;
  16   int res=1;
  17   unsigned int opt=1;
  18
  19   memset(&sin,0,sizeof(sin));
  20
  21   sin.sin_family=AF_INET;
  22   sin.sin_port=htons(socknum);
  23   sin.sin_addr.s_addr=htonl(ip);
  24
  25   if ((fd=socket(AF_INET,SOCK_STREAM,0))<0) {
  26     Error("proxyscan",ERR_ERROR,"Unable to create socket (%d)",errno);
  27     return -1;
  28   }
  29   if (ioctl(fd,FIONBIO,&res)!=0) {
  30     Error("proxyscan",ERR_ERROR,"Unable to make socket nonblocking");
  31     return -1;
  32   }
  33   if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *) &opt, sizeof(opt))!=0) {
  34     Error("proxyscan",ERR_ERROR,"Unable to set SO_REUSEADDR on scan socket.");
  35     return -1;
  36   }
  37 #ifdef __FreeBSD__
  38   opt=IP_PORTRANGE_HIGH;
  39   if (setsockopt(fd, IPPROTO_IP, IP_PORTRANGE, (char *) &opt, sizeof(opt))!=0) {
  40     Error("proxyscan",ERR_WARNING,"Error selecting high port range.");
  41   }
  42 #endif
  43   if (connect(fd,(const struct sockaddr *) &sin, sizeof(sin))) {
  44     if (errno != EINPROGRESS) {
  45       Error("proxyscan",ERR_ERROR,"Unable to connect socket (%d)",errno);
  46       return -1;
  47     }
  48   }
  49   return fd;
  50 }
  51