tools/purge/convert.cc

   1 #include "squid.h"
   2
   3 // Author:  Jens-S. V?ckler <voeckler@rvs.uni-hannover.de>
   4 //
   5 // File:    convert.cc
   6 //          Thu Oct 30 1997
   7 //
   8 // (c) 1997 Lehrgebiet Rechnernetze und Verteilte Systeme
   9 //          Universit?t Hannover, Germany
  10 //
  11 // Permission to use, copy, modify, distribute, and sell this software
  12 // and its documentation for any purpose is hereby granted without fee,
  13 // provided that (i) the above copyright notices and this permission
  14 // notice appear in all copies of the software and related documentation,
  15 // and (ii) the names of the Lehrgebiet Rechnernetze und Verteilte
  16 // Systeme and the University of Hannover may not be used in any
  17 // advertising or publicity relating to the software without the
  18 // specific, prior written permission of Lehrgebiet Rechnernetze und
  19 // Verteilte Systeme and the University of Hannover.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  23 // WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  24 //
  25 // IN NO EVENT SHALL THE LEHRGEBIET RECHNERNETZE UND VERTEILTE SYSTEME OR
  26 // THE UNIVERSITY OF HANNOVER BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
  27 // INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES
  28 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT
  29 // ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY,
  30 // ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  31 // SOFTWARE.
  32 //
  33 // Revision 1.3  2000/06/20 09:43:01  voeckler
  34 // added FreeBSD related fixes and support.
  35 //
  36 // Revision 1.2  1999/01/19 11:00:50  voeckler
  37 // Linux glibc2 fixes for sockets.
  38 //
  39 // Revision 1.1  1998/08/13 21:38:04  voeckler
  40 // Initial revision
  41 //
  42 //
  43
  44 #include "convert.hh"
  45
  46 #include <cstdlib>
  47 #include <cstring>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <netdb.h>
  51
  52 #ifndef SA
  53 #define SA struct sockaddr
  54 #endif
  55
  56 const char*
  57 my_inet_ntoa( const struct in_addr& a, HostAddress output )
  58 // purpose: thread-safely convert IPv4 address -> ASCII representation
  59 // paramtr: a (IN): networked representation of IPv4 address
  60 //          buffer (OUT): storage area to store representation into.
  61 // returns: pointer to buffer
  62 // goodies: INADDR_ANY will be converted to "*"
  63 {
  64     if ( a.s_addr == ntohl(INADDR_ANY) ) {
  65         // 'default' or '*' or ...
  66         output[0] = '*';
  67         output[1] = '\0';
  68     } else {
  69         // ANSI C++ forbids casting to an array type, nag, nag, nag...
  70         unsigned char s[sizeof(a.s_addr)];
  71         memcpy( s, &a.s_addr, sizeof(a.s_addr) );
  72
  73         snprintf(output, sizeof(HostAddress), "%d.%d.%d.%d", s[0], s[1], s[2], s[3] );
  74     }
  75     return output;
  76 }
  77
  78 const char*
  79 my_sock_ntoa( const struct sockaddr_in& a, SockAddress buffer )
  80 // purpose: thread-safely convert IPv4 socket pair into ASCII rep.
  81 // paramtr: a (IN): sockaddr_in address
  82 //          buffer (OUT): storage area to store representation into.
  83 // returns: pointer to buffer
  84 {
  85     HostAddress host;
  86     snprintf( buffer, sizeof(SockAddress), "%s:%u",
  87               my_inet_ntoa(a.sin_addr,host), ntohs(a.sin_port) );
  88     return buffer;
  89 }
  90
  91 const char*
  92 my_sock_fd2a( int fd, SockAddress buffer, bool peer )
  93 // purpose: thread-safely convert IPv4 socket FD associated address
  94 //          to ASCII representation
  95 // paramtr: fd (IN): open socket FD
  96 //          buffer (OUT): storage area
  97 //          peer (IN): true, use peer (remote) socket pair
  98 //                     false, use own (local) socket pair
  99 // returns: NULL in case of error, or pointer to buffer otherwise
 100 //          Refer to errno in case of error (usually unconnected fd...)
 101 {
 102     struct sockaddr_in socket;
 103     socklen_t len = sizeof(socket);
 104
 105     if ( (peer ? getpeername( fd, (SA*) &socket, &len ) :
 106             getsockname( fd, (SA*) &socket, &len )) == -1 )
 107         return NULL;
 108     else
 109         return my_sock_ntoa( socket, buffer );
 110 }
 111
 112 int
 113 convertHostname( const char* host, in_addr& dst )
 114 // purpose: convert a numeric or symbolic hostname
 115 // paramtr: host (IN): host description to convert
 116 //          dst (OUT): the internet address in network byteorder.
 117 // returns: -1 in case of error, see h_errno; 0 otherwise.
 118 {
 119     if ( host == 0 ) return -1;
 120     unsigned long int h = inet_addr(host);
 121     if ( h == 0xFFFFFFFF && strncmp(host,"255.255.255.255",15) != 0 ) {
 122         // symbolic host
 123         struct hostent* dns = gethostbyname(host);
 124         if ( dns == NULL ) return -1;
 125         else memcpy( &dst.s_addr, dns->h_addr, dns->h_length );
 126     } else {
 127         // numeric host
 128         dst.s_addr = h;
 129     }
 130     return 0;
 131 }
 132
 133 int
 134 convertPortname( const char* port, unsigned short& dst )
 135 // purpose: convert a numeric or symbolic port number
 136 // paramtr: port (IN): port description to convert
 137 //          dst (OUT): port number in network byteorder.
 138 // returns: -1 in case of error, see errno; 0 otherwise.
 139 {
 140     int p = strtoul(port,0,0);
 141
 142     if ( p == 0 ) {
 143         // symbolic port
 144         struct servent* proto = getservbyname( port, "tcp" );
 145         if ( proto == NULL ) return -1;
 146         else dst = proto->s_port;
 147     } else {
 148         // numeric port
 149         dst = htons(p);
 150     }
 151     return 0;
 152 }