mirror of
https://gitlab.isc.org/isc-projects/dhcp
synced 2025-08-30 05:47:45 +00:00
Major rewrite
This commit is contained in:
Ted Lemon
parent
98dd66895c
commit
e581d6150f
@ -42,6 +42,9 @@
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#include "dhcpd.h"
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#include "dhctoken.h"
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void do_a_packet (int);
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void do_a_line (int);
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TIME cur_time;
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unsigned char packbuf [65536]; /* Should cover the gnarliest MTU... */
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@ -77,7 +80,7 @@ int main (argc, argv, envp)
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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_port = htons (2001);
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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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@ -99,157 +102,13 @@ int main (argc, argv, envp)
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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 (sock, &w);
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FD_SET (sock, &x);
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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) || FD_ISSET (sock, &w)
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|| FD_ISSET (sock, &x)) {
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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.options, bufs);
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if (decl.ciaddr) {
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tree_evaluate (decl.ciaddr);
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memcpy (&raw.ciaddr,
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decl.ciaddr -> value,
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decl.ciaddr -> len);
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} else
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memset (&raw.ciaddr, 0, sizeof raw.ciaddr);
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if (decl.yiaddr) {
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tree_evaluate (decl.yiaddr);
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memcpy (&raw.yiaddr,
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decl.yiaddr -> value,
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decl.yiaddr -> len);
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} else
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memset (&raw.yiaddr, 0, sizeof raw.yiaddr);
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if (decl.siaddr) {
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tree_evaluate (decl.siaddr);
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memcpy (&raw.siaddr,
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decl.siaddr -> value,
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decl.siaddr -> len);
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} else
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memset (&raw.siaddr, 0, sizeof raw.siaddr);
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if (decl.giaddr) {
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tree_evaluate (decl.giaddr);
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memcpy (&raw.giaddr,
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decl.giaddr -> value,
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decl.giaddr -> len);
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} else
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memset (&raw.giaddr, 0, sizeof raw.giaddr);
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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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to.sin_addr.s_addr = INADDR_BROADCAST;
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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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if (fork() > 0) {
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while (1)
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do_a_packet (sock);
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} else {
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while (1)
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do_a_line (sock);
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}
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}
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/* statement :== host_statement */
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@ -286,3 +145,158 @@ void parse_client_statement (cfile, decl)
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void cleanup ()
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{
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}
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void do_a_packet (sock)
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int sock;
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{
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struct sockaddr_in name;
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int flag;
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struct dhcp_packet incoming;
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struct packet ip;
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struct sockaddr_in from;
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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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int xid = 1;
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if ((result = recvfrom (sock, packbuf, sizeof packbuf, 0,
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(struct sockaddr *)&from, &fromlen)) < 0) {
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warn ("recvfrom failed: %m");
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sleep (5);
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return;
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}
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note ("request from %s, port %d",
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inet_ntoa (from.sin_addr), 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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dump_packet (&ip);
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}
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void do_a_line (sock)
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int sock;
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{
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int bufs = 0;
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FILE *cfile = stdin;
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char *val;
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int flag;
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int token;
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struct dhcp_packet raw;
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struct packet outgoing;
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struct sockaddr_in to;
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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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/* Parse a packet declaration from stdin, or exit if
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we've hit EOF. */
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token = peek_token (&val, cfile);
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if (token == EOF)
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return;
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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.options, bufs);
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if (decl.ciaddr) {
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tree_evaluate (decl.ciaddr);
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memcpy (&raw.ciaddr, decl.ciaddr -> value, decl.ciaddr -> len);
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} else
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memset (&raw.ciaddr, 0, sizeof raw.ciaddr);
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if (decl.yiaddr) {
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tree_evaluate (decl.yiaddr);
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memcpy (&raw.yiaddr,
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decl.yiaddr -> value,
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decl.yiaddr -> len);
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} else
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memset (&raw.yiaddr, 0, sizeof raw.yiaddr);
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if (decl.siaddr) {
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tree_evaluate (decl.siaddr);
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memcpy (&raw.siaddr,
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decl.siaddr -> value,
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decl.siaddr -> len);
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} else
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memset (&raw.siaddr, 0, sizeof raw.siaddr);
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if (decl.giaddr) {
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tree_evaluate (decl.giaddr);
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memcpy (&raw.giaddr,
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decl.giaddr -> value,
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decl.giaddr -> len);
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} else
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memset (&raw.giaddr, 0, sizeof raw.giaddr);
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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 (2000);
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to.sin_addr.s_addr = INADDR_BROADCAST;
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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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318
dhclient.c
318
dhclient.c
@ -42,6 +42,9 @@
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#include "dhcpd.h"
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#include "dhctoken.h"
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void do_a_packet (int);
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void do_a_line (int);
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TIME cur_time;
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unsigned char packbuf [65536]; /* Should cover the gnarliest MTU... */
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@ -77,7 +80,7 @@ int main (argc, argv, envp)
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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_port = htons (2001);
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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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@ -99,157 +102,13 @@ int main (argc, argv, envp)
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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 (sock, &w);
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FD_SET (sock, &x);
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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) || FD_ISSET (sock, &w)
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|| FD_ISSET (sock, &x)) {
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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.options, bufs);
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if (decl.ciaddr) {
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tree_evaluate (decl.ciaddr);
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memcpy (&raw.ciaddr,
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decl.ciaddr -> value,
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decl.ciaddr -> len);
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} else
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memset (&raw.ciaddr, 0, sizeof raw.ciaddr);
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if (decl.yiaddr) {
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tree_evaluate (decl.yiaddr);
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memcpy (&raw.yiaddr,
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decl.yiaddr -> value,
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decl.yiaddr -> len);
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} else
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memset (&raw.yiaddr, 0, sizeof raw.yiaddr);
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if (decl.siaddr) {
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tree_evaluate (decl.siaddr);
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memcpy (&raw.siaddr,
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decl.siaddr -> value,
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decl.siaddr -> len);
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} else
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memset (&raw.siaddr, 0, sizeof raw.siaddr);
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if (decl.giaddr) {
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tree_evaluate (decl.giaddr);
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memcpy (&raw.giaddr,
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decl.giaddr -> value,
|
||||
decl.giaddr -> len);
|
||||
} else
|
||||
memset (&raw.giaddr, 0, sizeof raw.giaddr);
|
||||
|
||||
raw.xid = xid++;
|
||||
raw.xid = htons (raw.xid);
|
||||
raw.secs = 0;
|
||||
raw.flags = 0;
|
||||
raw.hops = 0;
|
||||
raw.op = BOOTREQUEST;
|
||||
|
||||
to.sin_port = htons (2001);
|
||||
to.sin_addr.s_addr = INADDR_BROADCAST;
|
||||
to.sin_family = AF_INET;
|
||||
to.sin_len = sizeof to;
|
||||
memset (to.sin_zero, 0, sizeof to.sin_zero);
|
||||
|
||||
note ("Sending dhcp request to %s, port %d",
|
||||
inet_ntoa (to.sin_addr), htons (to.sin_port));
|
||||
|
||||
errno = 0;
|
||||
result = sendto (sock, &raw,
|
||||
outgoing.packet_length,
|
||||
0, (struct sockaddr *)&to, sizeof to);
|
||||
if (result < 0)
|
||||
warn ("sendto: %m");
|
||||
}
|
||||
} while (1);
|
||||
exit (0);
|
||||
if (fork() > 0) {
|
||||
while (1)
|
||||
do_a_packet (sock);
|
||||
} else {
|
||||
while (1)
|
||||
do_a_line (sock);
|
||||
}
|
||||
}
|
||||
|
||||
/* statement :== host_statement */
|
||||
@ -286,3 +145,158 @@ void parse_client_statement (cfile, decl)
|
||||
void cleanup ()
|
||||
{
|
||||
}
|
||||
|
||||
void do_a_packet (sock)
|
||||
int sock;
|
||||
{
|
||||
struct sockaddr_in name;
|
||||
int flag;
|
||||
struct dhcp_packet incoming;
|
||||
struct packet ip;
|
||||
struct sockaddr_in from;
|
||||
struct iaddr ifrom;
|
||||
int fromlen = sizeof from;
|
||||
int max = 0;
|
||||
int count;
|
||||
int result;
|
||||
int i;
|
||||
int xid = 1;
|
||||
|
||||
if ((result = recvfrom (sock, packbuf, sizeof packbuf, 0,
|
||||
(struct sockaddr *)&from, &fromlen)) < 0) {
|
||||
warn ("recvfrom failed: %m");
|
||||
sleep (5);
|
||||
return;
|
||||
}
|
||||
note ("request from %s, port %d",
|
||||
inet_ntoa (from.sin_addr), htons (from.sin_port));
|
||||
ifrom.len = 4;
|
||||
memcpy (ifrom.iabuf, &from.sin_addr, ifrom.len);
|
||||
memcpy (&incoming, packbuf, result);
|
||||
memset (&ip, 0, sizeof ip);
|
||||
ip.raw = &incoming;
|
||||
ip.packet_length = result;
|
||||
ip.client_port = ntohs (from.sin_port);
|
||||
ip.client_addr = ifrom;
|
||||
ip.client_sock = sock;
|
||||
parse_options (&ip);
|
||||
|
||||
dump_packet (&ip);
|
||||
}
|
||||
|
||||
void do_a_line (sock)
|
||||
int sock;
|
||||
{
|
||||
int bufs = 0;
|
||||
FILE *cfile = stdin;
|
||||
char *val;
|
||||
int flag;
|
||||
int token;
|
||||
struct dhcp_packet raw;
|
||||
struct packet outgoing;
|
||||
struct sockaddr_in to;
|
||||
int max = 0;
|
||||
int count;
|
||||
int result;
|
||||
int i;
|
||||
struct host_decl decl;
|
||||
int xid = 1;
|
||||
|
||||
/* Parse a packet declaration from stdin, or exit if
|
||||
we've hit EOF. */
|
||||
token = peek_token (&val, cfile);
|
||||
if (token == EOF)
|
||||
return;
|
||||
memset (&decl, 0, sizeof decl);
|
||||
parse_client_statement (cfile, &decl);
|
||||
|
||||
/* Fill in a packet based on the information
|
||||
entered by the user. */
|
||||
memset (&outgoing, 0, sizeof outgoing);
|
||||
memset (&raw, 0, sizeof raw);
|
||||
outgoing.raw = &raw;
|
||||
|
||||
/* Copy in the filename if given; otherwise, flag
|
||||
the filename buffer as available for options. */
|
||||
if (decl.filename)
|
||||
strncpy (raw.file,
|
||||
decl.filename, sizeof raw.file);
|
||||
else
|
||||
bufs |= 1;
|
||||
|
||||
/* Copy in the server name if given; otherwise, flag
|
||||
the server_name buffer as available for options. */
|
||||
if (decl.server_name)
|
||||
strncpy (raw.sname,
|
||||
decl.server_name, sizeof raw.sname);
|
||||
else
|
||||
bufs |= 2;
|
||||
|
||||
if (decl.interface_count) {
|
||||
memcpy (raw.chaddr,
|
||||
decl.interfaces [0].haddr,
|
||||
decl.interfaces [0].hlen);
|
||||
raw.htype = decl.interfaces [0].htype;
|
||||
raw.hlen = decl.interfaces [0].hlen;
|
||||
if (decl.interface_count > 1)
|
||||
note ("Only one interface used.");
|
||||
} else {
|
||||
raw.htype = raw.hlen = 0;
|
||||
}
|
||||
|
||||
cons_options ((struct packet *)0,
|
||||
&outgoing, decl.options, bufs);
|
||||
|
||||
if (decl.ciaddr) {
|
||||
tree_evaluate (decl.ciaddr);
|
||||
memcpy (&raw.ciaddr, decl.ciaddr -> value, decl.ciaddr -> len);
|
||||
} else
|
||||
memset (&raw.ciaddr, 0, sizeof raw.ciaddr);
|
||||
|
||||
if (decl.yiaddr) {
|
||||
tree_evaluate (decl.yiaddr);
|
||||
memcpy (&raw.yiaddr,
|
||||
decl.yiaddr -> value,
|
||||
decl.yiaddr -> len);
|
||||
} else
|
||||
memset (&raw.yiaddr, 0, sizeof raw.yiaddr);
|
||||
|
||||
if (decl.siaddr) {
|
||||
tree_evaluate (decl.siaddr);
|
||||
memcpy (&raw.siaddr,
|
||||
decl.siaddr -> value,
|
||||
decl.siaddr -> len);
|
||||
} else
|
||||
memset (&raw.siaddr, 0, sizeof raw.siaddr);
|
||||
|
||||
if (decl.giaddr) {
|
||||
tree_evaluate (decl.giaddr);
|
||||
memcpy (&raw.giaddr,
|
||||
decl.giaddr -> value,
|
||||
decl.giaddr -> len);
|
||||
} else
|
||||
memset (&raw.giaddr, 0, sizeof raw.giaddr);
|
||||
|
||||
raw.xid = xid++;
|
||||
raw.xid = htons (raw.xid);
|
||||
raw.secs = 0;
|
||||
raw.flags = 0;
|
||||
raw.hops = 0;
|
||||
raw.op = BOOTREQUEST;
|
||||
|
||||
to.sin_port = htons (2000);
|
||||
to.sin_addr.s_addr = INADDR_BROADCAST;
|
||||
to.sin_family = AF_INET;
|
||||
to.sin_len = sizeof to;
|
||||
memset (to.sin_zero, 0, sizeof to.sin_zero);
|
||||
|
||||
note ("Sending dhcp request to %s, port %d",
|
||||
inet_ntoa (to.sin_addr), htons (to.sin_port));
|
||||
|
||||
errno = 0;
|
||||
result = sendto (sock, &raw,
|
||||
outgoing.packet_length,
|
||||
0, (struct sockaddr *)&to, sizeof to);
|
||||
if (result < 0)
|
||||
warn ("sendto: %m");
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user