diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/core/fs/pxe/dhcp_option.c')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/core/fs/pxe/dhcp_option.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/contrib/syslinux/syslinux-4.03/core/fs/pxe/dhcp_option.c b/contrib/syslinux/syslinux-4.03/core/fs/pxe/dhcp_option.c deleted file mode 100644 index 50f2de0..0000000 --- a/contrib/syslinux/syslinux-4.03/core/fs/pxe/dhcp_option.c +++ /dev/null @@ -1,258 +0,0 @@ -#include <stdio.h> -#include <string.h> -#include <core.h> -#include <sys/cpu.h> -#include "pxe.h" - -char LocalDomain[256]; - -int over_load; -uint8_t uuid_type; -uint8_t uuid[16]; - -static void parse_dhcp_options(const void *, int, uint8_t); - -static void subnet_mask(const void *data, int opt_len) -{ - if (opt_len != 4) - return; - IPInfo.netmask = *(const uint32_t *)data; -} - -static void router(const void *data, int opt_len) -{ - if (opt_len != 4) - return; - IPInfo.gateway = *(const uint32_t *)data; -} - -static void dns_servers(const void *data, int opt_len) -{ - const uint32_t *dp = data; - int num = 0; - - while (num < DNS_MAX_SERVERS) { - uint32_t ip; - - if (opt_len < 4) - break; - - opt_len -= 4; - ip = *dp++; - if (ip_ok(ip)) - dns_server[num++] = ip; - } - while (num < DNS_MAX_SERVERS) - dns_server[num++] = 0; -} - -static void local_domain(const void *data, int opt_len) -{ - char buffer[256]; - char *ld = LocalDomain; - - memcpy(buffer, data, opt_len); - buffer[opt_len] = 0; - - dns_mangle(&ld, buffer); -} - -static void vendor_encaps(const void *data, int opt_len) -{ - /* Only recognize PXELINUX options */ - parse_dhcp_options(data, opt_len, 208); -} - -static void option_overload(const void *data, int opt_len) -{ - if (opt_len != 1) - return; - over_load = *(uint8_t *)data; -} - -static void server(const void *data, int opt_len) -{ - uint32_t ip; - - if (opt_len != 4) - return; - - if (IPInfo.serverip) - return; - - ip = *(uint32_t *)data; - if (ip_ok(ip)) - IPInfo.serverip = ip; -} - -static void client_identifier(const void *data, int opt_len) -{ - if (opt_len > MAC_MAX || opt_len < 2 || - MAC_len != (opt_len >> 8) || - *(uint8_t *)data != MAC_type) - return; - - opt_len --; - MAC_len = opt_len & 0xff; - memcpy(MAC, data+1, opt_len); - MAC[opt_len] = 0; -} - -static void bootfile_name(const void *data, int opt_len) -{ - memcpy(boot_file, data, opt_len); - boot_file[opt_len] = 0; -} - -static void uuid_client_identifier(const void *data, int opt_len) -{ - int type = *(const uint8_t *)data; - if (opt_len != 17 || type != 0 || have_uuid) - return; - - have_uuid = true; - uuid_type = type; - memcpy(uuid, data+1, 16); -} - -static void pxelinux_configfile(const void *data, int opt_len) -{ - DHCPMagic |= 2; - memcpy(ConfigName, data, opt_len); - ConfigName[opt_len] = 0; -} - -static void pxelinux_pathprefix(const void *data, int opt_len) -{ - DHCPMagic |= 4; - memcpy(path_prefix, data, opt_len); - path_prefix[opt_len] = 0; -} - -static void pxelinux_reboottime(const void *data, int opt_len) -{ - if (opt_len != 4) - return; - - RebootTime = ntohl(*(const uint32_t *)data); - DHCPMagic |= 8; /* Got reboot time */ -} - - -struct dhcp_options { - int opt_num; - void (*fun)(const void *, int); -}; - -static const struct dhcp_options dhcp_opts[] = { - {1, subnet_mask}, - {3, router}, - {6, dns_servers}, - {15, local_domain}, - {43, vendor_encaps}, - {52, option_overload}, - {54, server}, - {61, client_identifier}, - {67, bootfile_name}, - {97, uuid_client_identifier}, - {209, pxelinux_configfile}, - {210, pxelinux_pathprefix}, - {211, pxelinux_reboottime} -}; - -/* - * Parse a sequence of DHCP options, pointed to by _option_; - * -- some DHCP servers leave option fields unterminated - * in violation of the spec. - * - * filter contains the minimum value for the option to recognize - * -- this is used to restrict parsing to PXELINUX-specific options only. - */ -static void parse_dhcp_options(const void *option, int size, uint8_t opt_filter) -{ - int opt_num; - int opt_len; - const int opt_entries = sizeof(dhcp_opts) / sizeof(dhcp_opts[0]); - int i = 0; - const uint8_t *p = option; - const struct dhcp_options *opt; - - /* The only 1-byte options are 00 and FF, neither of which matter */ - while (size >= 2) { - opt_num = *p++; - size--; - - if (opt_num == 0) - continue; - if (opt_num == 0xff) - break; - - /* Anything else will have a length field */ - opt_len = *p++; /* c <- option lenght */ - size -= opt_len + 1; - if (size < 0) - break; - - if (opt_num >= opt_filter) { - opt = dhcp_opts; - for (i = 0; i < opt_entries; i++) { - if (opt_num == opt->opt_num) { - opt->fun(p, opt_len); - break; - } - opt++; - } - } - - /* parse next */ - p += opt_len; - } -} - -/* - * parse_dhcp - * - * Parse a DHCP packet. This includes dealing with "overloaded" - * option fields (see RFC 2132, section 9.3) - * - * This should fill in the following global variables, if the - * information is present: - * - * MyIP - client IP address - * server_ip - boot server IP address - * net_mask - network mask - * gate_way - default gateway router IP - * boot_file - boot file name - * DNSServers - DNS server IPs - * LocalDomain - Local domain name - * MAC_len, MAC - Client identifier, if MAC_len == 0 - * - * This assumes the DHCP packet is in "trackbuf". - * - */ -void parse_dhcp(int pkt_len) -{ - struct bootp_t *dhcp = (struct bootp_t *)trackbuf; - int opt_len; - - IPInfo.ipv4 = 4; /* This is IPv4 only for now... */ - - over_load = 0; - if (ip_ok(dhcp->yip)) - IPInfo.myip = dhcp->yip; - - if (ip_ok(dhcp->sip)) - IPInfo.serverip = dhcp->sip; - - opt_len = (char *)dhcp + pkt_len - (char *)&dhcp->options; - if (opt_len && (dhcp->option_magic == BOOTP_OPTION_MAGIC)) - parse_dhcp_options(&dhcp->options, opt_len, 0); - - if (over_load & 1) - parse_dhcp_options(&dhcp->bootfile, 128, 0); - else if (dhcp->bootfile[0]) - strcpy(boot_file, dhcp->bootfile); - - if (over_load & 2) - parse_dhcp_options(dhcp->sname, 64, 0); -} |