summaryrefslogtreecommitdiffstats
path: root/mdk-stage1/dhcp.c
diff options
context:
space:
mode:
Diffstat (limited to 'mdk-stage1/dhcp.c')
-rw-r--r--mdk-stage1/dhcp.c679
1 files changed, 0 insertions, 679 deletions
diff --git a/mdk-stage1/dhcp.c b/mdk-stage1/dhcp.c
deleted file mode 100644
index 32c7a932b..000000000
--- a/mdk-stage1/dhcp.c
+++ /dev/null
@@ -1,679 +0,0 @@
-/*
- * Guillaume Cottenceau (gc@mandrakesoft.com)
- *
- * Copyright 2000 MandrakeSoft
- *
- * This software may be freely redistributed under the terms of the GNU
- * public license.
- *
- * 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.
- *
- */
-
-/*
- * Portions from Erik Troan (ewt@redhat.com)
- *
- * Copyright 1996 Red Hat Software
- *
- */
-
-/*
- * Portions from GRUB -- GRand Unified Bootloader
- * Copyright (C) 2000 Free Software Foundation, Inc.
- */
-
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <arpa/inet.h>
-#include <net/route.h>
-#include <errno.h>
-#include <net/ethernet.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <sys/time.h>
-#include <time.h>
-#include <fcntl.h>
-#include <sys/poll.h>
-
-#include "stage1.h"
-#include "log.h"
-#include "network.h"
-#include "frontend.h"
-#include "automatic.h"
-
-#include "dhcp.h"
-
-
-typedef int bp_int32;
-typedef short bp_int16;
-
-#define BOOTP_OPTION_NETMASK 1
-#define BOOTP_OPTION_GATEWAY 3
-#define BOOTP_OPTION_DNS 6
-#define BOOTP_OPTION_HOSTNAME 12
-#define BOOTP_OPTION_DOMAIN 15
-#define BOOTP_OPTION_BROADCAST 28
-
-#define DHCP_OPTION_REQADDR 50
-#define DHCP_OPTION_LEASE 51
-#define DHCP_OPTION_TYPE 53
-#define DHCP_OPTION_SERVER 54
-#define DHCP_OPTION_OPTIONREQ 55
-#define DHCP_OPTION_MAXSIZE 57
-
-#define DHCP_OPTION_CLIENT_IDENTIFIER 61
-
-#define BOOTP_CLIENT_PORT 68
-#define BOOTP_SERVER_PORT 67
-
-#define BOOTP_OPCODE_REQUEST 1
-#define BOOTP_OPCODE_REPLY 2
-
-#define DHCP_TYPE_DISCOVER 1
-#define DHCP_TYPE_OFFER 2
-#define DHCP_TYPE_REQUEST 3
-#define DHCP_TYPE_ACK 5
-#define DHCP_TYPE_RELEASE 7
-
-#define BOOTP_VENDOR_LENGTH 64
-#define DHCP_VENDOR_LENGTH 340
-
-struct bootp_request {
- char opcode;
- char hw;
- char hwlength;
- char hopcount;
- bp_int32 id;
- bp_int16 secs;
- bp_int16 flags;
- bp_int32 ciaddr, yiaddr, server_ip, bootp_gw_ip;
- char hwaddr[16];
- char servername[64];
- char bootfile[128];
- char vendor[DHCP_VENDOR_LENGTH];
-} ;
-
-static const char vendor_cookie[] = { 99, 130, 83, 99, 255 };
-
-
-static unsigned int verify_checksum(void * buf2, int length2)
-{
- unsigned int csum = 0;
- unsigned short * sp;
-
- for (sp = (unsigned short *) buf2; length2 > 0; (length2 -= 2), sp++)
- csum += *sp;
-
- while (csum >> 16)
- csum = (csum & 0xffff) + (csum >> 16);
-
- return (csum == 0xffff);
-}
-
-
-static int initial_setup_interface(char * device, int s) {
- struct sockaddr_in * addrp;
- struct ifreq req;
- struct rtentry route;
- int true = 1;
-
- addrp = (struct sockaddr_in *) &req.ifr_addr;
-
- strcpy(req.ifr_name, device);
- addrp->sin_family = AF_INET;
- addrp->sin_port = 0;
- memset(&addrp->sin_addr, 0, sizeof(addrp->sin_addr));
-
- req.ifr_flags = 0; /* take it down */
- if (ioctl(s, SIOCSIFFLAGS, &req)) {
- log_perror("SIOCSIFFLAGS (downing)");
- return -1;
- }
-
- addrp->sin_family = AF_INET;
- addrp->sin_addr.s_addr = htonl(0);
- if (ioctl(s, SIOCSIFADDR, &req)) {
- log_perror("SIOCSIFADDR");
- return -1;
- }
-
- req.ifr_flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING;
- if (ioctl(s, SIOCSIFFLAGS, &req)) {
- log_perror("SIOCSIFFLAGS (upping)");
- return -1;
- }
-
- memset(&route, 0, sizeof(route));
- memcpy(&route.rt_gateway, addrp, sizeof(*addrp));
-
- addrp->sin_family = AF_INET;
- addrp->sin_port = 0;
- addrp->sin_addr.s_addr = INADDR_ANY;
- memcpy(&route.rt_dst, addrp, sizeof(*addrp));
- memcpy(&route.rt_genmask, addrp, sizeof(*addrp));
-
- route.rt_dev = device;
- route.rt_flags = RTF_UP;
- route.rt_metric = 0;
-
- if (ioctl(s, SIOCADDRT, &route)) {
- if (errno != EEXIST) {
- close(s);
- log_perror("SIOCADDRT");
- return -1;
- }
- }
-
- if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &true, sizeof(true))) {
- close(s);
- log_perror("setsockopt");
- return -1;
- }
-
- /* I need to sleep a bit in order for kernel to finish init of the
- network device; this would allow to not send further multiple
- dhcp requests when only one is needed. */
- wait_message("Bringing up networking...");
- sleep(2);
- remove_wait_message();
-
- return 0;
-}
-
-
-void set_missing_ip_info(struct interface_info * intf)
-{
- bp_int32 ipNum = *((bp_int32 *) &intf->ip);
- bp_int32 nmNum;
-
- if (intf->netmask.s_addr == 0)
- inet_aton(guess_netmask(inet_ntoa(intf->ip)), &intf->netmask);
-
- nmNum = *((bp_int32 *) &intf->netmask);
-
- if (intf->broadcast.s_addr == 0)
- *((bp_int32 *) &intf->broadcast) = (ipNum & nmNum) | ~(nmNum);
-
- if (intf->network.s_addr == 0)
- *((bp_int32 *) &intf->network) = ipNum & nmNum;
-}
-
-static void parse_reply(struct bootp_request * breq, struct interface_info * intf)
-{
- unsigned char * chptr;
- unsigned char option, length;
-
- if (breq->bootfile && strlen(breq->bootfile) > 0)
- stage2_kickstart = strdup(breq->bootfile);
-
- memcpy(&intf->ip, &breq->yiaddr, 4);
-
- chptr = breq->vendor;
- chptr += 4;
- while (*chptr != 0xFF && (void *) chptr < (void *) breq->vendor + DHCP_VENDOR_LENGTH) {
- char tmp_str[500];
- option = *chptr++;
- if (!option)
- continue;
- length = *chptr++;
-
- switch (option) {
- case BOOTP_OPTION_DNS:
- memcpy(&dns_server, chptr, sizeof(dns_server));
- log_message("got dns %s", inet_ntoa(dns_server));
- if (length >= sizeof(dns_server)*2) {
- memcpy(&dns_server2, chptr+sizeof(dns_server), sizeof(dns_server2));
- log_message("got dns2 %s", inet_ntoa(dns_server2));
- }
- break;
-
- case BOOTP_OPTION_NETMASK:
- memcpy(&intf->netmask, chptr, sizeof(intf->netmask));
- log_message("got netmask %s", inet_ntoa(intf->netmask));
- break;
-
- case BOOTP_OPTION_DOMAIN:
- memcpy(tmp_str, chptr, length);
- tmp_str[length] = '\0';
- domain = strdup(tmp_str);
- log_message("got domain %s", domain);
- break;
-
- case BOOTP_OPTION_BROADCAST:
- memcpy(&intf->broadcast, chptr, sizeof(intf->broadcast));
- log_message("got broadcast %s", inet_ntoa(intf->broadcast));
- break;
-
- case BOOTP_OPTION_GATEWAY:
- memcpy(&gateway, chptr, sizeof(gateway));
- log_message("got gateway %s", inet_ntoa(gateway));
- break;
-
- case BOOTP_OPTION_HOSTNAME:
- memcpy(tmp_str, chptr, length);
- tmp_str[length] = '\0';
- hostname = strdup(tmp_str);
- log_message("got hostname %s", hostname);
- break;
-
- }
-
- chptr += length;
- }
-
- set_missing_ip_info(intf);
-}
-
-
-static void init_vendor_codes(struct bootp_request * breq) {
- memcpy(breq->vendor, vendor_cookie, sizeof(vendor_cookie));
-}
-
-static char gen_hwaddr[16];
-
-static int prepare_request(struct bootp_request * breq, int sock, char * device)
-{
- struct ifreq req;
-
- memset(breq, 0, sizeof(*breq));
-
- breq->opcode = BOOTP_OPCODE_REQUEST;
-
- strcpy(req.ifr_name, device);
- if (ioctl(sock, SIOCGIFHWADDR, &req)) {
- log_perror("SIOCSIFHWADDR");
- return -1;
- }
-
- breq->hw = 1; /* ethernet */
- breq->hwlength = IFHWADDRLEN;
- memcpy(breq->hwaddr, req.ifr_hwaddr.sa_data, IFHWADDRLEN);
- memcpy(gen_hwaddr, req.ifr_hwaddr.sa_data, IFHWADDRLEN);
-
- breq->hopcount = 0;
-
- init_vendor_codes(breq);
-
- return 0;
-}
-
-static int get_vendor_code(struct bootp_request * bresp, unsigned char option, void * data)
-{
- unsigned char * chptr;
- unsigned int length, theOption;
-
- chptr = bresp->vendor + 4;
- while (*chptr != 0xFF && *chptr != option) {
- theOption = *chptr++;
- if (!theOption)
- continue;
- length = *chptr++;
- chptr += length;
- }
-
- if (*chptr++ == 0xff)
- return 1;
-
- length = *chptr++;
- memcpy(data, chptr, length);
-
- return 0;
-}
-
-
-static unsigned long currticks(void)
-{
- struct timeval tv;
- unsigned long csecs;
- unsigned long ticks_per_csec, ticks_per_usec;
-
- /* Note: 18.2 ticks/sec. */
-
- gettimeofday (&tv, 0);
- csecs = tv.tv_sec / 10;
- ticks_per_csec = csecs * 182;
- ticks_per_usec = (((tv.tv_sec - csecs * 10) * 1000000 + tv.tv_usec) * 182 / 10000000);
- return ticks_per_csec + ticks_per_usec;
-}
-
-
-#define BACKOFF_LIMIT 7
-#define TICKS_PER_SEC 18
-#define MAX_ARP_RETRIES 4
-
-static void rfc951_sleep(int exp)
-{
- static long seed = 0;
- long q;
- unsigned long tmo;
-
- if (exp > BACKOFF_LIMIT)
- exp = BACKOFF_LIMIT;
-
- if (!seed)
- /* Initialize linear congruential generator. */
- seed = (currticks () + *(long *) &gen_hwaddr + ((short *) gen_hwaddr)[2]);
-
- /* Simplified version of the LCG given in Bruce Scheier's
- "Applied Cryptography". */
- q = seed / 53668;
- if ((seed = 40014 * (seed - 53668 * q) - 12211 * q) < 0)
- seed += 2147483563l;
-
- /* Compute mask. */
- for (tmo = 63; tmo <= 60 * TICKS_PER_SEC && --exp > 0; tmo = 2 * tmo + 1)
- ;
-
- /* Sleep. */
- log_message("<sleep>");
-
- for (tmo = (tmo & seed) + currticks (); currticks () < tmo;);
-}
-
-
-static int handle_transaction(int s, struct bootp_request * breq, struct bootp_request * bresp,
- struct sockaddr_in * server_addr, int dhcp_type)
-{
- struct pollfd polls;
- int i, j;
- int retry = 1;
- int sin;
- char eth_packet[ETH_FRAME_LEN];
- struct iphdr * ip_hdr;
- struct udphdr * udp_hdr;
- unsigned char type;
- unsigned long starttime;
- int timeout = 1;
-
- breq->id = starttime = currticks();
- breq->secs = 0;
-
- sin = socket(AF_PACKET, SOCK_DGRAM, ntohs(ETH_P_IP));
- if (sin < 0) {
- log_perror("af_packet socket");
- return -1;
- }
-
- while (retry <= MAX_ARP_RETRIES) {
- i = sizeof(*breq);
-
- if (sendto(s, breq, i, 0, (struct sockaddr *) server_addr, sizeof(*server_addr)) != i) {
- close(s);
- log_perror("sendto");
- return -1;
- }
-
- polls.fd = sin;
- polls.events = POLLIN;
-
- while (poll(&polls, 1, timeout*1000) == 1) {
-
- if ((j = recv(sin, eth_packet, sizeof(eth_packet), 0)) == -1) {
- log_perror("recv");
- continue;
- }
-
- /* We need to do some basic sanity checking of the header */
- if (j < (signed)(sizeof(*ip_hdr) + sizeof(*udp_hdr)))
- continue;
-
- ip_hdr = (void *) eth_packet;
- if (!verify_checksum(ip_hdr, sizeof(*ip_hdr)))
- continue;
-
- if (ntohs(ip_hdr->tot_len) > j)
- continue;
-
- j = ntohs(ip_hdr->tot_len);
-
- if (ip_hdr->protocol != IPPROTO_UDP)
- continue;
-
- udp_hdr = (void *) (eth_packet + sizeof(*ip_hdr));
-
- if (ntohs(udp_hdr->source) != BOOTP_SERVER_PORT)
- continue;
-
- if (ntohs(udp_hdr->dest) != BOOTP_CLIENT_PORT)
- continue;
- /* Go on with this packet; it looks sane */
-
- /* Originally copied sizeof (*bresp) - this is a security
- problem due to a potential underflow of the source
- buffer. Also, it trusted that the packet was properly
- 0xFF terminated, which is not true in the case of the
- DHCP server on Cisco 800 series ISDN router. */
-
- memset (bresp, 0xFF, sizeof (*bresp));
- memcpy (bresp, (char *) udp_hdr + sizeof (*udp_hdr), j - sizeof (*ip_hdr) - sizeof (*udp_hdr));
-
- /* sanity checks */
- if (bresp->id != breq->id)
- continue;
- if (bresp->opcode != BOOTP_OPCODE_REPLY)
- continue;
- if (bresp->hwlength != breq->hwlength)
- continue;
- if (memcmp(bresp->hwaddr, breq->hwaddr, bresp->hwlength))
- continue;
- if (get_vendor_code(bresp, DHCP_OPTION_TYPE, &type) || type != dhcp_type)
- continue;
- if (memcmp(bresp->vendor, vendor_cookie, 4))
- continue;
- return 0;
- }
- rfc951_sleep(retry);
- breq->secs = htons ((currticks () - starttime) / 20);
- retry++;
- timeout *= 2;
- if (timeout > 5)
- timeout = 5;
- }
-
- return -1;
-}
-
-static void add_vendor_code(struct bootp_request * breq, unsigned char option, unsigned char length, void * data)
-{
- unsigned char * chptr;
- int theOption, theLength;
-
- chptr = breq->vendor;
- chptr += 4;
- while (*chptr != 0xFF && *chptr != option) {
- theOption = *chptr++;
- if (!theOption) continue;
- theLength = *chptr++;
- chptr += theLength;
- }
-
- *chptr++ = option;
- *chptr++ = length;
- memcpy(chptr, data, length);
- chptr[length] = 0xff;
-}
-
-
-char * dhcp_hostname = NULL;
-char * dhcp_domain = NULL;
-
-enum return_type perform_dhcp(struct interface_info * intf)
-{
- int s, i;
- struct sockaddr_in server_addr;
- struct sockaddr_in client_addr;
- struct sockaddr_in broadcast_addr;
- struct bootp_request breq, bresp;
- unsigned char messageType;
- unsigned int lease;
- short aShort;
- int num_options;
- char requested_options[50];
- char * client_id_str, * client_id_hwaddr;
-
- if (strncmp(intf->device, "eth", 3)) {
- stg1_error_message("DHCP available only for Ethernet networking.");
- return RETURN_ERROR;
- }
-
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- log_perror("socket");
- return RETURN_ERROR;
- }
-
- {
- enum return_type results;
- char * questions[] = { "Host name", "Domain name", NULL };
- char * questions_auto[] = { "hostname", "domain" };
- static char ** answers = NULL;
- char * boulet;
-
- client_id_str = client_id_hwaddr = NULL;
-
- results = ask_from_entries_auto("If the DHCP server needs to know you by name; please fill in this information. "
- "Valid answers are for example: `mybox' for hostname and `mynetwork.com' for "
- "domain name, for a machine called `mybox.mynetwork.com' on the Internet.",
- questions, &answers, 32, questions_auto, NULL);
- if (results == RETURN_OK)
- {
- dhcp_hostname = answers[0];
- if ((boulet = strchr(dhcp_hostname, '.')) != NULL)
- boulet[0] = '\0';
- dhcp_domain = answers[1];
-
- if (*dhcp_hostname && *dhcp_domain) {
- /* if we have both, then create client id from them */
- client_id_str = malloc(1 + strlen(dhcp_hostname) + 1 + strlen(dhcp_domain) + 1);
- client_id_str[0] = '\0';
- sprintf(client_id_str+1, "%s.%s", dhcp_hostname, dhcp_domain);
- }
- }
- }
-
- if (initial_setup_interface(intf->device, s) != 0) {
- close(s);
- return RETURN_ERROR;
- }
-
- if (prepare_request(&breq, s, intf->device) != 0) {
- close(s);
- return RETURN_ERROR;
- }
-
- messageType = DHCP_TYPE_DISCOVER;
- add_vendor_code(&breq, DHCP_OPTION_TYPE, 1, &messageType);
-
- /* add pieces needed to have DDNS/DHCP IP selection based on requested name */
- if (dhcp_hostname && *dhcp_hostname) { /* pick client id form based on absence or presence of domain name */
- if (*dhcp_domain) /* alternate style <hostname>.<domainname> */
- add_vendor_code(&breq, DHCP_OPTION_CLIENT_IDENTIFIER, strlen(client_id_str+1)+1, client_id_str);
- else { /* usual style (aka windows / dhcpcd) */
- /* but put MAC in form required for client identifier first */
- client_id_hwaddr = malloc(IFHWADDRLEN+2);
- client_id_hwaddr[0] = 1; /* set flag for ethernet */
- memcpy(client_id_hwaddr+1, gen_hwaddr, IFHWADDRLEN);
- add_vendor_code(&breq, DHCP_OPTION_CLIENT_IDENTIFIER, IFHWADDRLEN+1, client_id_hwaddr);
- }
- /* this is the one that the dhcp server really wants for DDNS updates */
- add_vendor_code(&breq, BOOTP_OPTION_HOSTNAME, strlen(dhcp_hostname), dhcp_hostname);
- log_message("DHCP: telling server to use name = %s", dhcp_hostname);
- }
-
- memset(&client_addr.sin_addr, 0, sizeof(&client_addr.sin_addr));
- client_addr.sin_family = AF_INET;
- client_addr.sin_port = htons(BOOTP_CLIENT_PORT); /* bootp client */
-
- if (bind(s, (struct sockaddr *) &client_addr, sizeof(client_addr))) {
- log_perror("bind");
- return RETURN_ERROR;
- }
-
- broadcast_addr.sin_family = AF_INET;
- broadcast_addr.sin_port = htons(BOOTP_SERVER_PORT); /* bootp server */
- memset(&broadcast_addr.sin_addr, 0xff, sizeof(broadcast_addr.sin_addr)); /* broadcast */
-
- log_message("DHCP: sending DISCOVER");
-
- wait_message("Sending DHCP request...");
- i = handle_transaction(s, &breq, &bresp, &broadcast_addr, DHCP_TYPE_OFFER);
- remove_wait_message();
-
- if (i != 0) {
- stg1_error_message("No DHCP reply received.");
- close(s);
- return RETURN_ERROR;
- }
-
- server_addr.sin_family = AF_INET;
- server_addr.sin_port = htons(BOOTP_SERVER_PORT); /* bootp server */
- if (get_vendor_code(&bresp, DHCP_OPTION_SERVER, &server_addr.sin_addr)) {
- close(s);
- log_message("DHCPOFFER didn't include server address");
- return RETURN_ERROR;
- }
-
- init_vendor_codes(&breq);
- messageType = DHCP_TYPE_REQUEST;
- add_vendor_code(&breq, DHCP_OPTION_TYPE, 1, &messageType);
- add_vendor_code(&breq, DHCP_OPTION_SERVER, 4, &server_addr.sin_addr);
- add_vendor_code(&breq, DHCP_OPTION_REQADDR, 4, &bresp.yiaddr);
-
- /* if used the first time, then have to use it again */
- if (dhcp_hostname && *dhcp_hostname) { /* add pieces needed to have DDNS/DHCP IP selection based on requested name */
- if (dhcp_domain && *dhcp_domain) /* alternate style */
- add_vendor_code(&breq, DHCP_OPTION_CLIENT_IDENTIFIER, strlen(client_id_str+1)+1, client_id_str);
- else /* usual style (aka windows / dhcpcd) */
- add_vendor_code(&breq, DHCP_OPTION_CLIENT_IDENTIFIER, IFHWADDRLEN+1, client_id_hwaddr);
- /* this is the one that the dhcp server really wants for DDNS updates */
- add_vendor_code(&breq, BOOTP_OPTION_HOSTNAME, strlen(dhcp_hostname), dhcp_hostname);
- }
-
- aShort = ntohs(sizeof(struct bootp_request));
- add_vendor_code(&breq, DHCP_OPTION_MAXSIZE, 2, &aShort);
-
- num_options = 0;
- requested_options[num_options++] = BOOTP_OPTION_NETMASK;
- requested_options[num_options++] = BOOTP_OPTION_GATEWAY;
- requested_options[num_options++] = BOOTP_OPTION_DNS;
- requested_options[num_options++] = BOOTP_OPTION_DOMAIN;
- requested_options[num_options++] = BOOTP_OPTION_BROADCAST;
- add_vendor_code(&breq, DHCP_OPTION_OPTIONREQ, num_options, requested_options);
-
- /* request a lease of 1 hour */
- i = htonl(60 * 60);
- add_vendor_code(&breq, DHCP_OPTION_LEASE, 4, &i);
-
- log_message("DHCP: sending REQUEST");
-
- i = handle_transaction(s, &breq, &bresp, &broadcast_addr, DHCP_TYPE_ACK);
-
- if (i != 0) {
- close(s);
- return RETURN_ERROR;
- }
-
- if (get_vendor_code(&bresp, DHCP_OPTION_LEASE, &lease)) {
- log_message("failed to get lease time\n");
- return RETURN_ERROR;
- }
- lease = ntohl(lease);
-
- close(s);
-
- intf->netmask.s_addr = 0;
- intf->broadcast.s_addr = 0;
- intf->network.s_addr = 0;
-
- parse_reply(&bresp, intf);
-
- return RETURN_OK;
-}
generated by cgit v1.2.1 (git 2.21.0) at 2024-05-01 02:42:47 +0000