webcit/locate_host.c

   1 /*
   2  * $Id$
   3  */
   4 /**
   5  * \defgroup Hostlookup Examine a socket and determine the name/address of the originating host.
   6  * \ingroup WebcitHttpServer
   7  */
   8 /*@{*/
   9
  10 #include "webcit.h"
  11
  12 /**
  13  * \brief get a hostname
  14  * \todo buffersize?
  15  * \param tbuf the returnbuffer
  16  * \param client_socket the sock fd where the client is connected
  17  */
  18 void locate_host(StrBuf *tbuf, int client_socket)
  19 {
  20         struct sockaddr_in cs;
  21         struct hostent *ch;
  22         socklen_t len;
  23         char *i;
  24         int a1, a2, a3, a4;
  25
  26         len = sizeof(cs);
  27         if (getpeername(client_socket, (struct sockaddr *) &cs, &len) < 0) {
  28                 StrBufAppendBufPlain(tbuf, HKEY("<unknown>"), 0);
  29                 return;
  30         }
  31         if ((ch = gethostbyaddr((char *) &cs.sin_addr, sizeof(cs.sin_addr),
  32                                 AF_INET)) == NULL) {
  33                 i = (char *) &cs.sin_addr;
  34                 a1 = ((*i++) & 0xff);
  35                 a2 = ((*i++) & 0xff);
  36                 a3 = ((*i++) & 0xff);
  37                 a4 = ((*i++) & 0xff);
  38                 StrBufPrintf(tbuf, "%d.%d.%d.%d", a1, a2, a3, a4);
  39                 return;
  40         }
  41         StrBufAppendBufPlain(tbuf, ch->h_name, -1, 0);
  42 }
  43
  44 /*@}*/