mirror of
https://gitlab.isc.org/isc-projects/dhcp
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258 lines
7.2 KiB
C
258 lines
7.2 KiB
C
/* dhclient.c
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DHCP client program. Intended for testing. */
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/*
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* Copyright (c) 1996 The Internet Software Consortium. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#include "dhcpd.h"
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#include "dhctoken.h"
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TIME cur_time;
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unsigned char packbuf [65536]; /* Should cover the gnarliest MTU... */
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int main (argc, argv, envp)
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int argc;
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char **argv;
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char **envp;
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{
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FILE *cfile = stdin;
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char *val;
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struct sockaddr_in name;
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int sock;
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int flag;
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int token;
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struct dhcp_packet incoming, raw;
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struct packet ip, outgoing;
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struct sockaddr_in from, to;
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struct iaddr ifrom;
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int fromlen = sizeof from;
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int max = 0;
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int count;
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int result;
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int i;
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struct host_decl decl;
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int xid = 1;
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memset (&ip, 0, sizeof ip);
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/* Set up the initial dhcp option universe. */
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initialize_universes ();
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/* Get the current time... */
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GET_TIME (&cur_time);
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name.sin_family = AF_INET;
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name.sin_port = htons (2000);
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name.sin_addr.s_addr = htonl (INADDR_ANY);
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memset (name.sin_zero, 0, sizeof (name.sin_zero));
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/* List addresses on which we're listening. */
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note ("Receiving on %s, port %d",
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inet_ntoa (name.sin_addr), htons (name.sin_port));
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if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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error ("Can't create dhcp socket: %m");
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flag = 1;
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if (setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
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&flag, sizeof flag) < 0)
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error ("Can't set SO_REUSEADDR option on dhcp socket: %m");
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if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
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&flag, sizeof flag) < 0)
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error ("Can't set SO_BROADCAST option on dhcp socket: %m");
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if (bind (sock, (struct sockaddr *)&name, sizeof name) < 0)
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error ("Can't bind to dhcp address: %m");
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do {
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fd_set r, w, x;
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FD_ZERO (&r);
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FD_ZERO (&w);
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FD_ZERO (&x);
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FD_SET (sock, &r);
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FD_SET (0, &r); /* stdin */
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if (select (sock + 1, &r, &w, &x, (struct timeval *)0) < 0) {
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error ("select: %m");
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}
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if (FD_ISSET (sock, &r)) {
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if ((result =
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recvfrom (sock, packbuf, sizeof packbuf, 0,
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(struct sockaddr *)&from, &fromlen))
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< 0) {
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warn ("recvfrom failed: %m");
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sleep (5);
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continue;
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}
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note ("request from %s, port %d",
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inet_ntoa (from.sin_addr),
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htons (from.sin_port));
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ifrom.len = 4;
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memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
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memcpy (&incoming, packbuf, result);
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memset (&ip, 0, sizeof ip);
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ip.raw = &incoming;
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ip.packet_length = result;
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ip.client_port = ntohs (from.sin_port);
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ip.client_addr = ifrom;
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ip.client_sock = sock;
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parse_options (&ip);
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printf ("\nPacket from %s, port %d\n",
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piaddr (ip.client_addr), ip.client_port);
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for (i = 0; i < 256; i++)
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if (ip.options [i].len)
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printf ("%s = %s;\n",
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dhcp_options [i].name,
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pretty_print_option
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(i,
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ip.options [i].data,
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ip.options [i].len));
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} else if (FD_ISSET (0, &r)) {
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int bufs = 0;
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/* Parse a packet declaration from stdin, or
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exit if we've hit EOF. */
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token = peek_token (&val, cfile);
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if (token == EOF)
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break;
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memset (&decl, 0, sizeof decl);
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parse_client_statement (cfile, &decl);
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/* Fill in a packet based on the information
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entered by the user. */
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memset (&outgoing, 0, sizeof outgoing);
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memset (&raw, 0, sizeof raw);
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outgoing.raw = &raw;
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/* Copy in the filename if given; otherwise, flag
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the filename buffer as available for options. */
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if (decl.filename)
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strncpy (raw.file,
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decl.filename, sizeof raw.file);
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else
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bufs |= 1;
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/* Copy in the server name if given; otherwise, flag
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the server_name buffer as available for options. */
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if (decl.server_name)
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strncpy (raw.sname,
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decl.server_name, sizeof raw.sname);
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else
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bufs |= 2;
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if (decl.interface_count) {
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memcpy (raw.chaddr,
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decl.interfaces [0].haddr,
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decl.interfaces [0].hlen);
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raw.htype = decl.interfaces [0].htype;
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raw.hlen = decl.interfaces [0].hlen;
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if (decl.interface_count > 1)
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note ("Only one interface used.");
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} else {
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raw.htype = raw.hlen = 0;
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}
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cons_options ((struct packet *)0,
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&outgoing, &decl, bufs);
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memset (&raw.ciaddr, 0, sizeof raw.ciaddr);
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memset (&raw.yiaddr, 0, sizeof raw.ciaddr);
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memset (&raw.siaddr, 0, sizeof raw.ciaddr);
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memset (&raw.giaddr, 0, sizeof raw.ciaddr);
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raw.xid = xid++;
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raw.xid = htons (raw.xid);
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raw.secs = 0;
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raw.flags = 0;
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raw.hops = 0;
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raw.op = BOOTREQUEST;
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to.sin_port = htons (2001);
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inet_aton ("206.119.204.48", &to.sin_addr);
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to.sin_family = AF_INET;
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to.sin_len = sizeof to;
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memset (to.sin_zero, 0, sizeof to.sin_zero);
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note ("Sending dhcp request to %s, port %d",
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inet_ntoa (to.sin_addr), htons (to.sin_port));
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errno = 0;
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result = sendto (sock, &raw,
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outgoing.packet_length,
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0, (struct sockaddr *)&to, sizeof to);
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if (result < 0)
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warn ("sendto: %m");
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}
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} while (1);
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exit (0);
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}
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/* statement :== host_statement */
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void parse_client_statement (cfile, decl)
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FILE *cfile;
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struct host_decl *decl;
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{
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char *val;
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jmp_buf bc;
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int token;
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switch (next_token (&val, cfile)) {
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case PACKET:
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memset (decl, 0, sizeof decl);
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if (!setjmp (bc)) {
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do {
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token = peek_token (&val, cfile);
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if (token == SEMI) {
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token = next_token (&val, cfile);
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break;
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}
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parse_host_decl (cfile, &bc, decl);
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} while (1);
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}
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break;
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default:
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parse_warn ("expecting a declaration.");
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skip_to_semi (cfile);
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break;
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}
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}
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void cleanup ()
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{
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}
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