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Matthew Ramsay
2000-08-01 01:26:26 +00:00
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AUTHORS Normal file
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NETtel DHCP Server Authors
--------------------------
Matthew Ramsay <matthewr@moreton.com.au> (Moreton Bay)
Chris Trew <christ@moreton.com.au> (Moreton Bay)
Other Credits:
--------------
Moreton Bay (http://www.moretonbay.com/)

339
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
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132
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0.8.29 (000323)
+ stable(?) release
0.8.28 (000323)
+ removed alarm as it was causing server to go down
+ removed debugging
+ break down dhcpd.c into manageable files
0.8.27 (000221)
+ OFFER also sends gateway/subnet (for picky dhcp clients)
+ multiple DNS now handled from resolv.conf if available
+ multiple WINS (from dhcpd.conf)
0.8.25 (000120)
+ now compiles *and* runs on a generic linux system
tested with a windows 98 client and the sample config
files in the samples directory.
0.8.24 (000117)
+ makeiplist tool has basic functionality in place
+ new sample config files
+ route add -host 255.255.255.255 dev eth0 added for generic linux
0.8.23 (000117)
+ NETtel specific fix for ignoring dhcp requests on 2nd interface
0.8.22 (000113)
+ minor changes to compile under a generic linux system
+ minor config file location changes for a generic linux system
+ makeiplist fixes.. still incomplete.. but etting closer
0.8.21 (000113)
+ now sends the correct server ip instead of hardcoded value
+ minor debugging fixes for critical messages
0.8.20 (000106)
+ cut out dhcp server checking.. this was causing dialout ppp
sessions with idle time set to never time out.
+ also removed the 10 second pause before launching.. as this
was originally to stop it replying to a dhcp client
on a NETtel which was really a bad way to do it in the
first place :-)
0.8.19 (000104)
+ fixes for route add -host on a machine that needs to run both
a DHCP client and server (dual eth box)
0.8.18 (991220)
+ Race conditions fixed by disabling alarm whilst the server is busy
+ Fixed continous clearing of the offered array so that it is only cleared
when it is dirty - (could change the position of when dirty is set)
0.8.17 (991212)
- has problems clearing out the offered array
0.8.16 (991203)
+ Non blocking error is changes to informational as it is not really
an error
0.8.15 (991129)
+ Servs the dns field 3 times (Nettel only) so that windows servers
dont time out whilst nettel is booting
0.8.14 (991126)
+ added owner check for the offered array so clean out time may be
increased
+ added new func to print out chadder/MAC
0.8.13 (991125)
+ added win95 support (w95 changed xid halfway through conversation)
+ had to change the offered array to use hardware addresses instead of xid
+ fixed re offered bug
+ added more debugging
0.8.12 (991111)
+ debugging was real bad.. cleaned up a bit.. needs overhaul
0.8.11 (991110)
+ fixed up offeredAddr array to actually be used now!! offeredAddr is
used to see if another simultaneous connecting client was offered
an address that we are about to offer another client (multiple
client bug)
+ removed re_offered variable as it breaks multiple client support
+ added lease time to ACK -- doesn't work if in OFFER
+ decreased internal array clear delay to 60 seconds
+ minor findAddr bug (returning -1 instead of 0)
+ if clients xid already in offeredAddr offer the same addr and don't add a
new addr to offered (caused by a client issuing multiple DISCOVERs)
0.8.10 (991105)
+ \n bug in arpping
+ minor debugging changes (removed printfs etc)
+ started browseiplist (not finished)
0.8.9 (19991105)
+ fixed options array size bug (options were cut off)
0.8.8 (19991105)
+ ignores requests from dhcpcd on the same machine
0.8.7 (19991104)
+ don't die if we can't bind to search for existing DHCP server
+ slightly more verbose syslogging
0.8.6 (19991103)
+ added makeiplist (not finished -- core dumps)
+ minor debug changes
0.8.5 (19991029)
+ exits if another DHCP server is already on the network
+ added Linux Makefile
0.8.4 (19991026)
+ minor bug fix in findaddr preventing an addr being found
0.8.3 (19991025)
+ fixed up debugging
+ minor hwaddr issues
0.8.2 (19991022)
+ free leases (new arpping code from dhcpcd)
+ fixed bug where crashes if no leases/iplist file
+ syslogging and debugging switch
+ serve DNS from resolv.conf
+ fixed bug where new lease added if same mac offered
+ now checks the ip is free b4 offering
+ now supports wins server

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EXEC = dhcpd
OBJS = dhcpd.o arpping.o socket.o options.o files.o debug.o nettel.o
ifdef BUILD_NETtel
CFLAGS += -DCONFIG_NETtel
endif
ifdef BUILD_NETtel1500
CFLAGS += -DCONFIG_NETtel
endif
all: $(EXEC)
$(EXEC): $(OBJS)
$(LD) $(LDFLAGS) -o $@.elf $(OBJS) $(LDLIBS)
$(CONVERT)
clean:
-rm -f $(EXEC) *.elf *.gdb *.o
$(OBJS): dhcpd.h socket.h options.h files.h debug.h nettel.h

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EXEC1 = dhcpd
OBJS1 = dhcpd.o arpping.o
EXEC2 = tools/makeiplist
OBJS2 = tools/makeiplist.o
EXEC3 = tools/browseiplist
OBJS3 = tools/browseiplist.o
all: $(EXEC1) $(EXEC2) $(EXEC3)
$(EXEC1): $(OBJS1)
gcc $(OBJS1) -o $(EXEC1)
$(EXEC2): $(OBJS2)
gcc $(OBJS2) -o $(EXEC2)
$(EXEC3): $(OBJS3)
gcc $(OBJS3) -o $(EXEC3)
clean:
-rm -f $(EXEC1) $(EXEC2) $(EXEC3) *.elf *.o core
$(OBJS1): dhcpd.h arpping.h
$(OBJS2):
$(OBJS3):

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Makefile.uClinux Normal file
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EXEC = dhcpd
OBJS = dhcpd.o arpping.o
all: $(EXEC)
$(EXEC): $(OBJS)
$(LD) $(LDFLAGS) -o $@.elf $(OBJS) $(LDLIBS)
$(CONVERT)
clean:
-rm -f $(EXEC) *.elf *.o
$(OBJS): dhcpd.h

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NETtel DHCP Server README
-------------------------
The NETtel DHCP Server is designed to run on a NETtel (which
runs on Greg Ungerer's uClinux-coldfire kernel) but will easily
run on normal Linux distributions for PCs.
The NETtel DHCP Server is designed deliberately to be a small,
lean, DHCP server. It does not implement the entire protocol
but only what is necessary to serve the following:
IP address (and its subnet)
Gateway address
DNS Server address
WINS (NetBIOS Name Server)
The lease times are hard coded to 10 days (from memory :-)
The NETtel DHCP Server employs a number of simple config files:
dhcpd.iplist
------------
Binary list of ip addresses that the server may offer. This list may
include ip addresses already leased out.
dhcpd.leased
------------
Binary list of leased ip addresses and their respective MAC address.
format:
16 byte MAC
8 byte ip address
16 byte MAC
8 byte ip address
.
etc.
example: hexdump dhcpd.leases
0: 00 AB 00 00 00 00 00 00-00 FF 00 00 00 00 00 01 ................
10: CB 18 97 78 00 BB 00 00-00 00 00 00 00 AA 00 00 ...x............
20: 00 00 00 CC CB 18 97 79-00 80 5F 94 28 2A 00 00 .......y.._.(*..
30: 00 00 00 00 00 00 00 00-CB 18 97 7A ...........z
dhcpd.conf
----------
/etc/config> cat dhcpd.conf
subnet 255.255.255.0
router 203.24.151.121
wins 203.50.0.24
/etc/config>
---
DNS is grabbed from resolv.conf:
nameserver x.x.x.x
nameserver y.y.y.y
nameserver z.z.z.z
Up to 3 DNS servers are supported.
---
Q&A
Q. Isn't this all very complicated for a lease/ip pool?
A. yes.. but it saves space :-)
Have fun!
-Moreton Bay DHCP Server development team.

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TODO Normal file
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TODO
----
+ if the number of simultaneous clients reaches MAX_SIMUL_CLIENTS the offer_num
count will reset and previously OFFERed clients may be temporarily NAKed
until the count stabalises
+ little/big endian issue probable cause for segmentation fault on i86 platform
+ makeiplist basic functionality works.. more user friendly interface required
+ browseiplist incomplete
+ better standard linux distro support

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arpping.c Normal file
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/*
* arpping.c
*
* Mostly stolen from: dhcpcd - DHCP client daemon
* by Yoichi Hariguchi <yoichi@fore.com>
*/
#include "arpping.h"
#define DEBUG 0
/* local prototypes */
int arpCheck(u_long inaddr, struct ifinfo *ifbuf, long timeout);
void mkArpMsg(int opcode, u_long tInaddr, u_char *tHaddr, u_long sInaddr, u_char *sHaddr, struct arpMsg *msg);
int openRawSocket (int *s, u_short type);
/* args: yiaddr - what IP to ping (eg. on the NETtel cb189701)
* retn: 1 addr free
* 0 addr used
* -1 error
*/
int arpping(u_int32_t yiaddr) {
int rv;
struct ifinfo ifbuf;
int n;
static int nr = 0;
unsigned char *ep;
/*unsigned char ep[6] = {0x00,0xd0,0xcf,0x00,0x01,0x0f};*/
/*
u_int32_t yiaddr = 0xcb189701;
u_int32_t yiaddr = 0xcb189778;
*/
strcpy(ifbuf.ifname, "eth0");
ifbuf.addr = 0xcb1897aa; /* this addr appears to be irrelevant */
/* ifbuf.mask = 0xffffff00;
ifbuf.bcast = 0xcb1897ff; */
ifbuf.mask = 0x0;
ifbuf.bcast = 0x0;
#if CONFIG_NETtel
/* rip the HW addr out of the flash :-)
* points to the memory where hwaddr is located */
ep = (unsigned char *) (0xf0006000);/* + (nr++ * 6));*/
#if 0
if ((ep[0] == 0xff) && (ep[1] == 0xff) && (ep[2] == 0xff) &&
(ep[3] == 0xff) && (ep[4] == 0xff) && (ep[5] == 0xff)) {
#if DEBUG
syslog(LOG_INFO, "DHCPD - oops! bad hwaddr (0xff)");
#endif
return -1;
} else if ((ep[0] == 0) && (ep[1] == 0) && (ep[2] == 0) &&
(ep[3] == 0) && (ep[4] == 0) && (ep[5] == 0)) {
#if DEBUG
syslog(LOG_INFO, "DHCPD - oops! bad hwaddr (0x00)");
#endif
return -1;
}
#endif
#endif
#if 0
printf("arpping hwaddr: ");
#endif
for(n=0;n<6;n++) {
#if 0
printf("%02x", ep[n]);
#endif
ifbuf.haddr[n] = ep[n];
}
#if 0
printf("\n");
#endif
ifbuf.flags = 0;
rv = arpCheck(yiaddr, &ifbuf, 3);
#if 0
printf("rv = %d (1=free, 0=used)\n", rv);
#endif
return rv;
}
int arpCheck(u_long inaddr, struct ifinfo *ifbuf, long timeout) {
int s; /* socket */
int rv; /* return value */
struct sockaddr addr; /* for interface name */
struct arpMsg arp;
fd_set fdset;
struct timeval tm;
time_t prevTime;
rv = 1;
openRawSocket(&s, ETH_P_ARP);
/* send arp request */
mkArpMsg(ARPOP_REQUEST, inaddr, NULL, ifbuf->addr, ifbuf->haddr, &arp);
bzero(&addr, sizeof(addr));
strcpy(addr.sa_data, ifbuf->ifname);
if ( sendto(s, &arp, sizeof(arp), 0, &addr, sizeof(addr)) < 0 ) {
#if 0
printf("sendto (arpCheck)");
#endif
rv = 0;
}
/* wait arp reply, and check it */
tm.tv_usec = 0;
time(&prevTime);
while ( timeout > 0 ) {
FD_ZERO(&fdset);
FD_SET(s, &fdset);
tm.tv_sec = timeout;
if ( select(s+1, &fdset, (fd_set *)NULL, (fd_set *)NULL, &tm) < 0 ) {
#if 0
printf("select (arpCheck)");
#endif
rv = 0;
}
if ( FD_ISSET(s, &fdset) ) {
if (recv(s, &arp, sizeof(arp), 0) < 0 ) {
#if 0
printf("recv (arpCheck)");
#endif
rv = 0;
}
if(arp.operation == htons(ARPOP_REPLY) && bcmp(arp.tHaddr, ifbuf->haddr, 6) == 0 && *((u_int *)arp.sInaddr) == inaddr ) {
rv = 0;
break;
}
}
timeout -= time(NULL) - prevTime;
time(&prevTime);
}
close(s);
return rv;
}
void mkArpMsg(int opcode, u_long tInaddr, u_char *tHaddr,
u_long sInaddr, u_char *sHaddr, struct arpMsg *msg) {
bzero(msg, sizeof(*msg));
bcopy(MAC_BCAST_ADDR, msg->ethhdr.h_dest, 6); /* MAC DA */
bcopy(sHaddr, msg->ethhdr.h_source, 6); /* MAC SA */
msg->ethhdr.h_proto = htons(ETH_P_ARP); /* protocol type (Ethernet) */
msg->htype = htons(ARPHRD_ETHER); /* hardware type */
msg->ptype = htons(ETH_P_IP); /* protocol type (ARP message) */
msg->hlen = 6; /* hardware address length */
msg->plen = 4; /* protocol address length */
msg->operation = htons(opcode); /* ARP op code */
*((u_int *)msg->sInaddr) = sInaddr; /* source IP address */
bcopy(sHaddr, msg->sHaddr, 6); /* source hardware address */
*((u_int *)msg->tInaddr) = tInaddr; /* target IP address */
if ( opcode == ARPOP_REPLY ) {
bcopy(tHaddr, msg->tHaddr, 6); /* target hardware address */
}
}
int openRawSocket (int *s, u_short type) {
int optval = 1;
if((*s = socket (AF_INET, SOCK_PACKET, htons (type))) == -1) {
#if 0
perror("socket");
printf("socket err\n");
#endif
return -1;
}
if(setsockopt (*s, SOL_SOCKET, SO_BROADCAST, &optval, sizeof (optval)) == -1) {
#if 0
perror("setsockopt");
printf("setsockopt err\n");
#endif
return -1;
}
}

50
arpping.h Normal file
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@@ -0,0 +1,50 @@
/*
* arpping .h
*/
#ifndef ARPPING_H
#define ARPPING_H
#define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
struct arpMsg {
struct ethhdr ethhdr; /* Ethernet header */
u_short htype; /* hardware type (must be ARPHRD_ETHER) */
u_short ptype; /* protocol type (must be ETH_P_IP) */
u_char hlen; /* hardware address length (must be 6) */
u_char plen; /* protocol address length (must be 4) */
u_short operation; /* ARP opcode */
u_char sHaddr[6]; /* sender's hardware address */
u_char sInaddr[4]; /* sender's IP address */
u_char tHaddr[6]; /* target's hardware address */
u_char tInaddr[4]; /* target's IP address */
u_char pad[18]; /* pad for min. Ethernet payload (60 bytes) */
};
struct ifinfo {
char ifname[IFNAMSIZ];
u_long addr; /* network byte order */
u_long mask; /* network byte order */
u_long bcast; /* network byte order */
u_char haddr[6];
short flags;
};
/* function prototypes */
int arpping(u_int32_t yiaddr);
#endif

16
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/* debug.c -- DHCP server debug specific functions */
#include "debug.h"
#include <syslog.h>
#if DEBUG
void print_chaddr(u_int8_t *chaddr,char *title) {
syslog(LOG_INFO,"%s = %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x",
title,chaddr[0],chaddr[1],chaddr[2],chaddr[4],
chaddr[4],chaddr[5],chaddr[6],chaddr[7],
chaddr[8],chaddr[9],chaddr[10],chaddr[11],
chaddr[12],chaddr[13],chaddr[14],chaddr[15]);
}
#endif

20
debug.h Normal file
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@@ -0,0 +1,20 @@
/* debug.h */
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#define DEBUG 0
#if DEBUG
void print_chaddr(u_int8_t *chaddr, char *title);
#endif

806
dhcpd.c Normal file
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/* dhcpd.c
*
* Moreton Bay DHCP Server
* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
* Chris Trew <ctrew@moreton.com.au>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <syslog.h>
#include <signal.h>
#include <errno.h>
#ifndef EMBED
#include <sys/ioctl.h>
#endif
#include "debug.h"
#include "dhcpd.h"
#include "arpping.h"
#include "socket.h"
#include "options.h"
#include "files.h"
#include "nettel.h"
/* prototypes */
int log_pid();
int getPacket(struct dhcpMessage *packet, int server_socket);
int sendOffer(int client_socket, struct dhcpMessage *oldpacket);
int sendNAK(int client_socket, struct dhcpMessage *oldpacket);
int sendACK(int client_socket, struct dhcpMessage *oldpacket);
u_int32_t findAddr(u_int8_t *chaddr, u_int32_t xid);
int test_ip(u_int32_t ipaddr);
u_int32_t freeIPAddresses(u_int32_t leased[],int num_leased);
/* globals */
struct dhcpOfferedAddr offeredAddr[MAX_SIMUL_CLIENTS];
int offer_num = 0; /* how many offers we are currently serving */
unsigned char server_ipaddr[4];
int main() {
int server_socket;
int client_socket;
int bytes;
struct dhcpMessage packet;
unsigned char *state, *hw_addr;
unsigned char *server_id;
int search_result;
/* server ip addr */
int fd = -1;
struct ifreq ifr;
struct sockaddr_in *sin;
/* by default 10.10.10.10 -- server id */
server_ipaddr[0] = 0xA;
server_ipaddr[1] = 0xA;
server_ipaddr[2] = 0xA;
server_ipaddr[3] = 0xA;
openlog("dhcpd", 0, 0);
syslog(LOG_INFO, "Moreton Bay DHCP Server (v%s) started", VERSION);
log_pid();
if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
strcpy(ifr.ifr_name, "eth0");
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
sin = (struct sockaddr_in *)&ifr.ifr_addr;
#if EMBED
sin->sin_addr.s_addr = htonl(sin->sin_addr.s_addr);
#endif
#if DEBUG
syslog(LOG_INFO, "eth0 (server_ip) = %s", inet_ntoa(sin->sin_addr));
#endif
memcpy(server_ipaddr, &sin->sin_addr, 4);
}
}
while(1) { /* loop until universe collapses */
server_socket = serverSocket(LISTEN_PORT);
if(server_socket == -1) {
syslog(LOG_ERR, "couldn't create server socket -- au revoir");
exit(0);
}
bytes = getPacket(&packet, server_socket); /* this waits for a packet - idle */
close(server_socket);
if(bytes < 0)
continue;
#ifdef CONFIG_NETtel
/*******************************************************************************************/
/* Now check to see if the request came from this NETtel.
* if so we wish to ignore its cries for an address */
if((state = getOption(packet.options, DHCP_CLIENT_ID)) == NULL) {
#if DEBUG
syslog(LOG_ERR, "couldnt get option from packet (CLIENT_ID) -- ignoring");
syslog(LOG_ERR, "maybe RedHat pump is the client.. -- ignore missing CLIENT_ID");
#endif
} else {
state++; /* move pointer up as state[0] == ARPHRD_ETHER == 0x01 */
hw_addr = (unsigned char *) (0xf0006000);
/* state should now be pointing to the hardware address as will
* hw_addr which points to a memory location inside the nettel */
#if DEBUG
syslog(LOG_INFO, "state = %02x%02x%02x%02x%02x%02x",state[0],state[1],state[2],state[3],state[4],state[5]);
syslog(LOG_INFO, "hw1 = %02x%02x%02x%02x%02x%02x",hw_addr[0],hw_addr[1],hw_addr[2],hw_addr[3],hw_addr[4],hw_addr[5]);
syslog(LOG_INFO, "hw2 = %02x%02x%02x%02x%02x%02x",hw_addr[6],hw_addr[7],hw_addr[8],hw_addr[9],hw_addr[10],hw_addr[11]);
#endif
if(memcmp(hw_addr,state,6) == 0) {
#if DEBUG
syslog(LOG_INFO, "not responding to my other half self");
#endif
continue; /* skip everything and listen to another request */
} else if(memcmp(hw_addr+6,state, 6) == 0) {
#if DEBUG
syslog(LOG_INFO, "not responding to my other half self");
#endif
continue; /* skip everything and listen to another request */
}
}
/*******************************************************************************************/
#endif
if((state = getOption(packet.options, DHCP_MESSAGE_TYPE)) == NULL) {
#if DEBUG
syslog(LOG_ERR, "couldnt get option from packet (MSG_TYPE) -- ignoring");
#endif
continue;
}
#ifdef CONFIG_NETtel
/* 1. why don't we add a 'route add -host allones eth0' here as
* an experiment.
* 2. we should lock the DHCP client from working until route_del_host()
*/
route_add_host(ADD);
#endif
if((client_socket = clientSocket(LISTEN_PORT, SEND_PORT)) == -1) {
syslog(LOG_ERR, "couldn't create client socket -- i'll try again");
continue;
}
switch(state[0]) {
case DHCPDISCOVER:
#if DEBUG
syslog(LOG_INFO,"received DISCOVER");
#endif
if(sendOffer(client_socket, &packet) == -1) {
syslog(LOG_ERR, "send OFFER failed -- ignoring");
close(client_socket);
continue; /* error occoured */
}
break;
case DHCPREQUEST:
#if DEBUG
syslog(LOG_INFO,"received REQUEST");
#endif
server_id = getOption(packet.options, 0x36);
if(server_id == NULL) {
#if DEBUG
syslog(LOG_INFO, "get option on 0x36 failed! NAKing");
#endif
sendNAK(client_socket, &packet);
/* Let's send an offer as well */
if(sendOffer(client_socket, &packet) == -1) {
syslog(LOG_ERR, "send OFFER failed -- ignoring");
close(client_socket);
continue; /* error occoured */
}
} else {
#if DEBUG
syslog(LOG_INFO, "server_id = %02x%02x%02x%02x", server_id[0], server_id[1],
server_id[2], server_id[3]);
#endif
if(memcmp(server_id, server_ipaddr, 4) == 0) {
if (sendACK(client_socket, &packet) == -1)
sendNAK(client_socket, &packet);
} else {
sendNAK(client_socket, &packet);
}
}
break;
default:
syslog(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
}
close(client_socket);
#ifdef CONFIG_NETtel
route_add_host(DEL); /* what the hell is this */
#endif
}
/* should never executes */
syslog(LOG_ERR, "exit");
closelog();
return 0;
}
int log_pid() {
int fd;
pid_t pid;
char *pidfile = PID_FILE;
pid = getpid();
if((fd = open(pidfile, O_WRONLY | O_CREAT, 0660)) < 0)
return -1;
write(fd, (void *) &pid, sizeof(pid));
close(fd);
}
int getPacket(struct dhcpMessage *packet, int server_socket) {
char buf[sizeof(struct dhcpMessage)];
u_int32_t magic;
int bytes;
#if DEBUG
syslog(LOG_INFO, "listening for any DHCP messages on network...");
#endif
memset(buf, 0, sizeof(buf));
bytes = read(server_socket, (char *)buf, sizeof(buf));
if(bytes < 0) {
#if DEBUG
syslog(LOG_INFO, "couldn't read on server socket -- ignoring");
#endif
return -1;
}
memcpy(packet, buf, sizeof(buf));
memcpy(&magic, &packet->cookie, 4);
if(htonl(magic) != MAGIC) {
syslog(LOG_ERR, "client sent bogus message -- ignoring");
return -1;
}
#if DEBUG
syslog(LOG_INFO, "oooooh!!! got some!");
#endif
return bytes;
}
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(int client_socket, struct dhcpMessage *oldpacket) {
FILE *in;
struct dhcpMessage packet;
char buf[sizeof(struct dhcpMessage)];
int bytes;
int n,k;
int address_used = FALSE;
int found_one = FALSE;
char tmp[32];
struct in_addr inp;
memset(&packet, 0, sizeof(packet));
packet.op = BOOTREPLY;
packet.htype = ETH_10MB;
packet.hlen = ETH_10MB_LEN;
packet.xid = oldpacket->xid;
if((packet.yiaddr = findAddr(oldpacket->chaddr, oldpacket->xid)) == 0) {
syslog(LOG_WARNING, "no IP addresses to give -- OFFER abandoned");
return -1;
}
memcpy(&packet.chaddr, oldpacket->chaddr, 16);
memcpy(&packet.cookie, "\x63\x82\x53\x63", 4);
memcpy(&packet.options, "\xff", 1);
addOption(packet.options, 0x35, 0x01, "\x02");
addOption(packet.options, 0x36, 0x04, server_ipaddr);
/* lease time */
addOption(packet.options, 0x33, 0x04, LEASE_TIME);
/* subnet */
if((search_config_file(DHCPD_CONF_FILE, "subnet", tmp)) == 1) {
inet_aton(tmp, &inp);
addOption(packet.options, 0x01, 0x04, (char *)&inp.s_addr);
}
/* gateway */
if((search_config_file(DHCPD_CONF_FILE, "router", tmp)) == 1) {
inet_aton(tmp, &inp);
addOption(packet.options, 0x03, 0x04, (char *)&inp.s_addr);
}
memcpy(buf, &packet, sizeof(packet));
#if DEBUG
syslog(LOG_INFO, "sending OFFER");
#endif
bytes = send(client_socket, buf, sizeof(buf), 0);
if(bytes == -1) {
#if DEBUG
syslog(LOG_ERR, "couldn't write to client_socket -- OFFER abandoned");
#endif
return -1;
}
return 0;
}
int sendNAK(int client_socket, struct dhcpMessage *oldpacket) {
struct dhcpMessage packet;
char buf[sizeof(struct dhcpMessage)];
int bytes;
memset(&packet, 0, sizeof(packet));
packet.op = BOOTREPLY;
packet.htype = ETH_10MB;
packet.hlen = ETH_10MB_LEN;
packet.xid = oldpacket->xid;
memcpy(&packet.chaddr, oldpacket->chaddr, 16);
memcpy(&packet.cookie, "\x63\x82\x53\x63", 4);
memcpy(&packet.options, "\xff", 1);
/* options should look like this:
* 0x350106 -- NAK
* 0x3604serverid - server id */
addOption(packet.options, 0x35, 0x01, "\x06");
addOption(packet.options, 0x36, 0x04, server_ipaddr);
memcpy(buf, &packet, sizeof(packet));
#if DEBUG
syslog(LOG_INFO, "sending NAK");
#endif
bytes = send(client_socket, buf, sizeof(buf), 0);
if(bytes == -1) {
#if DEBUG
syslog(LOG_ERR, "error writing to client -- NAK abandoned");
#endif
return -1;
}
return 0;
}
int sendACK(int client_socket, struct dhcpMessage *oldpacket) {
struct dhcpMessage packet;
char buf[sizeof(struct dhcpMessage)];
int bytes;
int k;
char tmp[96];
char tmp1[32];
char tmp2[32];
char tmp3[32];
struct in_addr inp;
struct in_addr inp1;
struct in_addr inp2;
struct in_addr inp3;
int result = FALSE;
int num;
memset(&packet, 0, sizeof(packet));
packet.op = BOOTREPLY;
packet.htype = ETH_10MB;
packet.hlen = ETH_10MB_LEN;
packet.xid = oldpacket->xid;
packet.ciaddr = oldpacket->ciaddr;
memcpy(&packet.chaddr, oldpacket->chaddr, 16);
memcpy(&packet.chaddr, oldpacket->chaddr, 16);
memcpy(&packet.cookie, "\x63\x82\x53\x63", 4);
memcpy(&packet.options, "\xff", 1);
/* loop thru offeredAddr to find which addr we
* offered this client */
#if DEBUG
syslog(LOG_INFO, "cycling thru offered array of size %d", offer_num);
#endif
for(k=0;k<offer_num;k++) { /* cycle through the offered array */
if(memcmp(offeredAddr[k].chaddr,packet.chaddr, 16) == 0) {
#if DEBUG
syslog(LOG_INFO, "chaddr matches what I have in my internel offer array");
#endif
packet.yiaddr = offeredAddr[k].yiaddr;
inp.s_addr = packet.yiaddr;
#if DEBUG
syslog(LOG_INFO,"i'll attempt to ACK with ip_addr %s", inet_ntoa(inp));
#else
syslog(LOG_INFO,"serving %s", inet_ntoa(inp));
#endif
offeredAddr[k].yiaddr = offeredAddr[offer_num-1].yiaddr;
memcpy(offeredAddr[k].chaddr, offeredAddr[offer_num-1].chaddr, 16);
offer_num--;
result = TRUE;
break;
}
}
if (result != TRUE) { /* if we cant find it in the offered array somthing has gone wrong */
syslog(LOG_ERR, "couldn't find in offer array -- ACK abandoned");
return -1;
}
/* options should look like this:
* 0x350106 -- NAK
* 0x3604 serverid - server id */
addOption(packet.options, 0x35, 0x01, "\x05");
addOption(packet.options, 0x36, 0x04, server_ipaddr);
addOption(packet.options, 0x33, 0x04, LEASE_TIME);
/* subnet */
if((search_config_file(DHCPD_CONF_FILE, "subnet", tmp)) == 1) {
inet_aton(tmp, &inp);
addOption(packet.options, 0x01, 0x04, (char *)&inp.s_addr);
}
/* gateway */
if((search_config_file(DHCPD_CONF_FILE, "router", tmp)) == 1) {
inet_aton(tmp, &inp);
addOption(packet.options, 0x03, 0x04, (char *)&inp.s_addr);
}
/* DNS */
#ifdef CONFIG_NETtel
if((num = get_multiple_entries("/etc/config/resolv.conf", "nameserver", tmp1, tmp2, tmp3)) > 0) {
#else
if((num = get_multiple_entries("/etc/resolv.conf", "nameserver", tmp1,tmp2,tmp3)) > 0) {
#endif
if(num>0) {
inet_aton(tmp1, &inp1);
if(num>1) {
inet_aton(tmp2, &inp2);
if(num>2) {
inet_aton(tmp3, &inp3);
}
}
}
if(num == 1) {
add_multiple_option(packet.options, 0x06, 0x04, (char *)&inp1.s_addr, NULL, NULL);
} else if(num == 2) {
add_multiple_option(packet.options, 0x06, 0x08, (char *)&inp1.s_addr, (char *)&inp2.s_addr, NULL);
} else if (num == 3) {
add_multiple_option(packet.options, 0x06, 0x0c, (char *)&inp1.s_addr, (char *)&inp2.s_addr, (char *)&inp3.s_addr);
}
}
/* WINS */
if((search_config_file(DHCPD_CONF_FILE, "wins", tmp)) == 1) {
inet_aton(tmp, &inp);
addOption(packet.options, 0x2C, 0x04, (char *)&inp.s_addr);
}
memcpy(buf, &packet, sizeof(packet));
#if DEBUG
syslog(LOG_INFO, "sending ACK");
#endif
bytes = send(client_socket, buf, sizeof(buf), 0);
if(bytes == -1) {
#if DEBUG
syslog(LOG_ERR, "error writing to client_socket -- ACK abandoned");
#endif
return -1;
}
/* write new ip to lease section of config file
* check that we dont write a lease that is already in the
* lease file (ie. reusing address since MAC is the same
* if it came from the lease file already dont re add it */
if(check_if_already_leased(packet.yiaddr) == 0) {
addLeased(packet.yiaddr, packet.chaddr);
}
#ifdef CONFIG_NETtel
if(commitChanges() == -1)
return -1;
#endif
return 0;
}
u_int32_t findAddr(u_int8_t *chaddr, u_int32_t xid) {
u_int32_t yiaddr = 0;
u_int32_t iplist[MAX_IP_ADDR];
u_int32_t leased[MAX_IP_ADDR];
FILE *in = NULL;
int n = 0;
int k,i;
size_t items; /* return value for fread */
int num_ip_addr;
int num_leased;
u_int8_t mac_addr[16];
u_int32_t ip_addr;
int ip_leased = FALSE; /* is the addressed leased? */
int already_in_offered = FALSE;
/* see if this chaddr is in the offered pool first */
/* don't add this addr to offeredAddr if chaddr already in there! */
/* win95 has a bad habbit of changing xid's halfway thru a conversation */
for(n=0;n<offer_num;n++) {
if(memcmp(offeredAddr[n].chaddr,chaddr,16) == 0) {
#if DEBUG
syslog(LOG_INFO, "chaddr already in offer array");
#endif
already_in_offered = TRUE;
break;
}
}
if (already_in_offered == TRUE) {
#if DEBUG
syslog(LOG_INFO, "i've already offered you an address -- have it again (%x)", offeredAddr[n].yiaddr);
#endif
return offeredAddr[n].yiaddr;
} else {
#if DEBUG
syslog(LOG_INFO, "searching for new address for new client");
#endif
}
/* open up dhcpd.iplist */
if((in = fopen(DHCPD_IPLIST_FILE, "r")) == NULL) {
syslog(LOG_ERR, "%s not found -- no IP pool to draw from", DHCPD_IPLIST_FILE);
return -1;
}
/* Read in all the values into the iplist Array*/
while(TRUE) {
items = fread(&iplist[n++], sizeof(u_int32_t), 1, in);
if(items < 1)
break;
}
fclose(in);
num_ip_addr = n-1;
if((in = fopen(DHCPD_LEASES_FILE, "r")) == NULL) {
#if DEBUG
syslog(LOG_WARNING, "dhcpd.leases not found -- no leases");
#endif
}
n=0;
/* Read in the mac - IP pair from the leases file */
while(TRUE) {
if(in == NULL)
break;
items = fread(&mac_addr, sizeof(mac_addr), 1, in);
if(items < 1)
break;
items = fread(&ip_addr, sizeof(ip_addr), 1, in);
if(items < 1)
break;
#if DEBUG
syslog(LOG_INFO,"file yielded valid MAC/IP pair - ip_addr = %x", ip_addr);
print_chaddr(mac_addr,"MAC");
print_chaddr(mac_addr,"CDR");
#endif
if(memcmp(mac_addr, chaddr, sizeof(mac_addr)) == 0) {
#if DEBUG
syslog(LOG_INFO, "hey! i've seen you around before...");
#endif
/* ooh! the connecting clients MAC address
* is already in lease file!! let's offer him
* the address he used last time */
#if DEBUG
syslog(LOG_INFO, "i found an address you've used before.. have it again");
#endif
memcpy(offeredAddr[offer_num].chaddr,chaddr,16);
offeredAddr[offer_num].yiaddr = ip_addr;
if(offer_num < MAX_SIMUL_CLIENTS)
offer_num++;
else {
syslog(LOG_ERR, "Ahhh!! i'm not configured to handle that many simultaneous clients!!");
syslog(LOG_ERR, "I'm resetteing my offer count and trying again");
offer_num=0;
}
return ip_addr;
} else {
/* Add it to the array for later comparison between available leases
* and the ones that are already leased */
#if DEBUG
syslog(LOG_INFO, "added lease to array");
#endif
leased[n++] = ip_addr;
}
}
if(in != NULL)
fclose(in);
num_leased = n;
/* compare the leased addresses with the actual list and
* find the first free address */
/* also check the offeredAddr array so we don't offer the same
* addr to simultaneously connecting clients */
for(n=0;n<num_ip_addr;n++) {
for(k=0;k<num_leased;k++) {
if(iplist[n] == leased[k]) {
/* address already leased */
#if DEBUG
syslog(LOG_INFO, "address %x is already leased... skipping", iplist[n]);
#endif
ip_leased = TRUE;
break;
}
}
if(ip_leased == FALSE) { /* if the ip wasnt leased */
/* check that it is not in offered list */
for(i=0;i<offer_num;i++) { /* cycle thru offered array */
if(iplist[n] == offeredAddr[i].yiaddr) { /* already there.. hand it out again */
if (memcmp(offeredAddr[i].chaddr,chaddr,16) == 0) {
#if DEBUG
syslog(LOG_INFO, "already in offered array.. have it again!");
#endif
break;
}
#if DEBUG
syslog(LOG_INFO, "address already offered but not yet cleared..");
#endif
ip_leased = TRUE;
break;
}
}
if(ip_leased == FALSE) {
/* Now we test to see if the address is actually currently taken
* if it is we should also set it to leased in the leased file */
#if EMBED
if (test_ip(iplist[n]) == 0) {
/* it passed the test you are free to have it */
#if DEBUG
syslog(LOG_INFO, "address arped and is free");
#endif
yiaddr = iplist[n]; /* after setting the yiaddr for testing later */
break;/* breaks outer loop */
}
#if DEBUG
else {
/* looks like that IP is taken */
syslog(LOG_INFO, "free IP is not so free...");
}
#endif
#else
yiaddr = iplist[n];
#endif
} else {
#if DEBUG
syslog(LOG_INFO, "sorry.. another simultaneous client has been offered this address..");
#endif
}
}
ip_leased = FALSE;
}
/* If you wanted you could compare the num ip addresses leased (num_leased) to
* the total num ip addresses (num_ip_addr) and determine a ratio to start
* freeing up ip addresses -- HERE */
if(yiaddr == 0) {
/* no free ip addresses remain */
#if DEBUG
syslog(LOG_INFO, "no free IP addresses found in pool -- attempting to free one");
#endif
/* If the ip addresses are full then there is somthing wrong
* It will only occour when a network card has been replaced on a machine thus
* is very rare or there are more machines than addresses which is stoopid that
* is why we should only check this when the list is full and a machine is
* requesting an IP address.
* Also Arp.c should be checked to make sure all addresses are correct */
#if EMBED
if ((yiaddr = freeIPAddresses(leased,num_leased)) == 0) { /* No IP addresses could be freed */
#if DEBUG
syslog(LOG_ERR, "couldn't free any IP addresses -- add more to pool");
#endif
} else {
#if DEBUG
syslog(LOG_INFO, "i found a freeable IP address.. let's use that");
#endif
}
#else
syslog(LOG_INFO, "out of IP addresses -- add more to pool");
#endif
}
#if DEBUG
syslog(LOG_INFO, "the IP address i'll use is %x", yiaddr);
#endif
memcpy(offeredAddr[offer_num].chaddr,chaddr,16); /* cp chaddr to offered array */
offeredAddr[offer_num].yiaddr = yiaddr;
if(offer_num < MAX_SIMUL_CLIENTS)
offer_num++;
else {
syslog(LOG_ERR, "Ahhh!! i'm not configured to handle that many simultaneous clients!!");
syslog(LOG_ERR, "I'm resetteing my offer count and trying again");
offer_num=0;
}
return yiaddr;
}
u_int32_t freeIPAddresses (u_int32_t leased[],int num_leased) {
int i;
int found;
for(i=0;i<num_leased;i++) {
#if EMBED
found = arpping(htonl(leased[i]));
#else
found = arpping(leased[i]);
#endif
if (found == 1) { /* if free address */
/* if it timed out without a response */
#if DEBUG
syslog(LOG_INFO, "i found a spare address %x",leased[i]);
#endif
return(leased[i]);
break;
} else if (found == 0) { /* address used */
#if DEBUG
syslog(LOG_INFO, "address already active - %x",leased[i]);
#endif
}
}
return 0; /* Address not found */
}
/* Tests a free ip to check that it is not actually leased if it is it will
* add the lease to the lease file and return 1
* ret: 0 on success (not leased to another party )
* 1 on success (actually leased to another party but lease file successfully updated)
* -1 error */
int test_ip(u_int32_t ipaddr) {
int found;
u_int8_t chaddr[16] = {0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00};
#if DEBUG
syslog(LOG_INFO, "pinging IP to see if leased");
#endif
#if EMBED
found = arpping(htonl(ipaddr));
#else
found = arpping(ipaddr);
#endif
#if DEBUG
syslog(LOG_INFO, "arpping returned %d", found);
#endif
if (found == 1) { /* if free address */
/*if it timed out without a response*/
#if DEBUG
syslog(LOG_INFO, "IP is free to use");
#endif
return 0;
} else if (found == 0) { /* address is used */
#if DEBUG
syslog(LOG_INFO, "IP is NOT free to use");
#endif
/* now go add it to the leased file. */
if (addLeased(ipaddr, chaddr) == -1) {
return 1;
}
#if DEBUG
else {
syslog(LOG_INFO, "IP address leased and HW is zerod");
}
#endif
}
return -1;
}

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/* dhcpd.h */
#define VERSION "0.8.29"
/************************************/
/* Defaults _you_ may want to tweak */
/************************************/
#define MAX_SIMUL_CLIENTS 16 /* maximum number of simultaneous clients */
/* the period of time the client is allowed to use that address */
#define LEASE_TIME "\x00\x0d\x2f\x00"
/* where to find the DHCP server files */
#define DHCPD_CONF_FILE "/etc/config/dhcpd.conf"
#define DHCPD_IPLIST_FILE "/etc/config/dhcpd.iplist"
#define DHCPD_LEASES_FILE "/etc/config/dhcpd.leases"
#define PID_FILE "/var/log/dhcpd.pid"
/*****************************************************************/
/* Do not modify below here unless you know what you are doing!! */
/*****************************************************************/
/* DHCP protocol -- see RFC */
#define LISTEN_PORT 67
#define SEND_PORT 68
#define MAGIC 0x63825363
#define DHCP_MESSAGE_TYPE 0x35
#define DHCP_SERVER_ID 0x36
#define DHCP_CLIENT_ID 0x3d
#define BOOTREQUEST 1
#define BOOTREPLY 2
#define ETH_10MB 1
#define ETH_10MB_LEN 6
#define DHCPDISCOVER 1
#define DHCPOFFER 2
#define DHCPREQUEST 3
#define DHCPDECLINE 4
#define DHCPACK 5
#define DHCPNAK 6
#define DHCPRELEASE 7
/* miscellaneous defines */
#define IPLIST 0
#define LEASED 1
#define TRUE 1
#define FALSE 0
#define MAX_BUF_SIZE 20 /* max xxx.xxx.xxx.xxx-xxx\n */
#define MAX_IP_ADDR 254
#define ADD 1
#define DEL 2
struct dhcpMessage {
u_int8_t op;
u_int8_t htype;
u_int8_t hlen;
u_int8_t hops;
u_int32_t xid;
u_int16_t secs;
u_int16_t flags;
u_int32_t ciaddr;
u_int32_t yiaddr;
u_int32_t siaddr;
u_int32_t giaddr;
u_int8_t chaddr[16];
u_int8_t sname[64];
u_int8_t file[128];
u_int32_t cookie;
#ifdef EMBED
u_int8_t options[128]; /* should be 308 but have to conserve space :-) */
#else
u_int8_t options[308];
#endif
};
struct dhcpOfferedAddr {
u_int8_t chaddr[16];
u_int32_t yiaddr;
};

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/* files.c -- DHCP server file manipulation */
#include "debug.h"
#include "dhcpd.h"
#include <stdio.h>
#include <syslog.h>
int get_multiple_entries(char *hay, char *needle, char *tmp1, char *tmp2, char *tmp3) {
int num=0;
FILE *in;
int len;
char buffer[32], w[32], v[32];
#if DEBUG
syslog(LOG_ERR, "get_multiple_entries of %s from %s", needle, hay);
#endif
if ((in = fopen(hay, "r")) == NULL)
return -1;
while((fgets(buffer, 32 - 1, in)) != NULL) {
/* check if it's what we want */
if((sscanf(buffer, "%s %s", w, v) >= 1) && (strcmp(w, needle) == 0)) {
if(num == 0) {
strcpy(tmp1, v);
num++;
} else if(num == 1) {
strcpy(tmp2, v);
num++;
} else if(num == 2) {
strcpy(tmp3, v);
num++;
}
}
}
fclose(in);
#if DEBUG
syslog(LOG_INFO, "num=%d, tmp=%s, tmp2=%s, tmp3=%s", num, tmp1, tmp2, tmp3);
#endif
return num;
}
/* opens up dhcpd.leases and looks for yiaddr.. returning
* 1 if it finds it, 0 if not. */
int check_if_already_leased(u_int32_t yiaddr) {
u_int32_t lease;
FILE *in;
int n = 0;
u_int8_t mac_addr[16];
u_int32_t ip_addr;
int num_ip_addr;
size_t items; /* return value for fread */
if((in = fopen(DHCPD_LEASES_FILE, "r")) == NULL) {
#if DEBUG
syslog(LOG_ERR, "dhcpd.leases not found -- no defined leases");
#endif
return 0;
}
/* Read in the mac - IP pair from the leases file */
while(TRUE) {
items = fread(&mac_addr, sizeof(mac_addr), 1, in);
if(items < 1)
break;
items = fread(&ip_addr, sizeof(ip_addr), 1, in);
if(items < 1)
break;
#if DEBUG
syslog(LOG_INFO,"got a valid MAC/IP pair from dhcpd.leases");
syslog(LOG_INFO,"ip_addr taken = %x", ip_addr);
#endif
/* check if yiaddr matches ip_addr */
if(ip_addr == yiaddr) {
/* ip already in lease file */
fclose(in);
return 1;
}
}
fclose(in);
return 0;
}
int addLeased(u_int32_t yiaddr, u_int8_t *chaddr) {
FILE *in;
#if DEBUG
syslog(LOG_INFO,"Writing new lease to lease file (IP = %08x)",yiaddr);
print_chaddr(chaddr,"MAC");
#endif
if ((in = fopen(DHCPD_LEASES_FILE, "a")) == NULL)
return -1;
fwrite(chaddr, 16, 1, in);
fwrite(&yiaddr, sizeof(u_int32_t), 1, in);
fclose(in);
return 0;
}
/* This function opens up the file specified 'filename' and searches
* through the file for 'keyword'. If 'keyword' is found any string
* following it is stored in 'value'.. If 'value' is NULL we assume
* the function was called simply to determing if the keyword exists
* in the file.
*
* args: filename (IN) - config filename
* keyword (IN) - word to search for in config file
* value (OUT) - value of keyword (if value not NULL)
*
* retn: -1 on error,
* 0 if keyword not found,
* 1 if found
*/
int search_config_file(char *filename, char *keyword, char *value) {
FILE *in;
int len;
char buffer[32], w[32], v[32];
if ((in = fopen(filename, "r")) == NULL)
return -1;
while((fgets(buffer, 32 - 1, in)) != NULL) {
/* check if it's what we want */
if((sscanf(buffer, "%s %s", w, v) >= 1) && (strcmp(w, keyword) == 0)) {
/* found it :-) */
if(value == NULL) {
return 1;
} else {
strcpy(value, v);
fclose(in);
/* tell them we got it */
return 1;
}
}
}
fclose(in);
return 0;
}

7
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/* files.h */
int search_config_file(char *filename, char *keyword, char *value);
int addLeased(u_int32_t yiaddr, u_int8_t chaddr[16]);
int check_if_already_leased(u_int32_t yiaddr);
int get_multiple_entries(char *hay, char *needle, char *tmp1, char *tmp2, char *tmp3);

58
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/* nettel.c -- NETtel specific functions for the DHCP server */
#ifdef CONFIG_NETtel
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include "dhcpd.h"
int commitChanges() {
char value[5];
pid_t pid;
FILE *in;
/* get the pid of flatfsd */
if ((in = fopen("/var/log/flatfsd.pid", "r")) == NULL)
return -1;
if(fread(&pid, sizeof(pid_t), 1, in) <= 0) {
fclose(in);
return -1;
}
fclose(in);
if((kill(pid, 10)) == -1)
return -1;
return 0;
}
int route_add_host(int type) {
pid_t pid;
char *argv[16];
int s, argc = 0;
/* route add -host 255.255.255.255 eth0 */
if((pid = vfork()) == 0) { /* child */
argv[argc++] = "/bin/route";
if(type == ADD)
argv[argc++] = "add";
else if(type == DEL)
argv[argc++] = "del";
argv[argc++] = "-host";
argv[argc++] = "255.255.255.255";
argv[argc++] = "eth0";
argv[argc] = NULL;
execvp("/bin/route", argv);
exit(0);
} else if (pid > 0) {
waitpid(pid, &s, 0);
}
return 0;
}
#endif

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/* nettel.h */
int commitChanges();
int route_add_host(int type);

102
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/* options.c -- DHCP server option packet tools */
#include <stdio.h>
/* add new option data to the options field terminating
* with an 0xff */
int addOption(unsigned char *optionptr, unsigned char code,
char datalength, char *data) {
endOption(&optionptr);
optionptr[0] = code;
if(code == 0xff)
return 0;
optionptr++;
optionptr[0] = datalength;
optionptr++;
memcpy(optionptr, data, datalength);
optionptr += datalength;
optionptr[0] = 0xff;
return 0;
}
int add_multiple_option(unsigned char *optionptr, unsigned char code,
char datalength, char *data1, char *data2, char *data3) {
endOption(&optionptr);
optionptr[0] = code;
if(code == 0xff)
return 0;
optionptr++;
optionptr[0] = datalength;
optionptr++;
if(data1 != NULL) {
memcpy(optionptr, data1, 0x04);
optionptr += 0x04;
if(data2 != NULL) {
memcpy(optionptr, data2, 0x04);
optionptr += 0x04;
if(data3 != NULL) {
memcpy(optionptr, data3, 0x04);
optionptr += 0x04;
}
}
}
optionptr[0] = 0xff;
return 0;
}
int addOptionMulti(unsigned char *optionptr, unsigned char code,
char datalength, char *data,int mul) {
int i;
endOption(&optionptr);
optionptr[0] = code;
if(code == 0xff)
return 0;
optionptr++;
optionptr[0] = (datalength * mul);
optionptr++;
for (i=0;i<mul;i++) {
memcpy(optionptr, data, datalength);
optionptr += datalength;
}
optionptr[0] = 0xff;
return 0;
}
/* update the option pointer to point to where the 0xff is */
int endOption(unsigned char **optionptr) {
unsigned char *tmpptr = *optionptr;
while(tmpptr[0] != 0xff) {
if(tmpptr[0] == 0x00)
continue;
tmpptr++;
tmpptr += tmpptr[0];
tmpptr++;
}
*optionptr = tmpptr;
return 0;
}
unsigned char *getOption(unsigned char *options, int option_val) {
while(options[0] != 0xff) {
if(options[0] == 0) {
options++;
continue;
}
if(options[0] == 0xff)
return NULL;
if(options[0] == option_val)
return options+2;
options++;
options += options[0];
options++;
}
return NULL; /* never executed */
}

10
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/* options.h */
unsigned char *getOption(unsigned char *options, int option_val);
int endOption(unsigned char **optionptr);
int addOption(unsigned char *optionptr, unsigned char code, char datalength, char *data);
int addOptionMulti(unsigned char *optionptr, unsigned char code,
char datalength, char *data,int mul);
int add_multiple_option(unsigned char *optionptr, unsigned char code,
char datalength, char *data1, char *data2, char *data3);

30
samples/README Normal file
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By default, on generic Linux systems, these files should be located in
/etc/ directory. You can change this by editing the #define in dhcpd.c
DHCPD_*_FILE
dhcpd.conf
----------
Sample DHCPD config file where the following entries are permitted:
subnet x.x.x.x
wins x.x.x.x
gateway x.x.x.x
dns x.x.x.x
dhcpd.iplist
------------
sample DHCPD IP list pool file (must be in binary format).
This sample file has the following addresses in the pool (and
was created with the 'makeiplist' tool):
192.168.111.33
192.168.111.34
192.168.111.35
192.168.111.36

4
samples/dhcpd.conf Normal file
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subnet 255.255.255.0
router 192.168.111.1
dns 192.168.111.2
wins 192.168.111.3

1
samples/dhcpd.iplist Normal file
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@@ -0,0 +1 @@
<EFBFBD><EFBFBD>o!<21><>o"<22><>o#<23><>o$

75
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/* socket.c -- DHCP server client/server socket creation */
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
/*
#ifndef EMBED
#include <sys/ioctl.h>
#endif
*/
int serverSocket(short listen_port) {
int server_socket;
struct sockaddr_in server;
int n = 1;
server_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(server_socket == -1)
return -1;
bzero(&server, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(listen_port);
server.sin_addr.s_addr = INADDR_ANY;
if(setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1)
return -1;
if(bind(server_socket, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1)
return -1;
return server_socket;
}
int clientSocket(short send_from_port, short send_to_port) {
int n = 1;
int client_socket;
struct sockaddr_in client;
client_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(client_socket == -1)
return -1;
if (setsockopt(client_socket, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1)
return -1;
setsockopt(client_socket, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n));
bzero(&client, sizeof(client));
client.sin_family = AF_INET;
client.sin_port = htons(send_from_port);
client.sin_addr.s_addr = INADDR_ANY;
if(bind(client_socket,(struct sockaddr *)&client, sizeof(struct sockaddr))==-1)
return -1;
bzero(&client, sizeof(client));
client.sin_family = AF_INET;
client.sin_port = htons(send_to_port);
client.sin_addr.s_addr = INADDR_BROADCAST;
if(connect(client_socket, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1)
return -1;
return client_socket;
}

5
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/* socket.h */
int serverSocket(short listen_port);
int clientSocket(short send_from_port, short send_to_port);