diff options
Diffstat (limited to 'networking/udhcp/options.c')
| -rw-r--r-- | networking/udhcp/options.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c deleted file mode 100644 index d394b4c..0000000 --- a/networking/udhcp/options.c +++ /dev/null @@ -1,172 +0,0 @@ -/* - * options.c -- DHCP server option packet tools - * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001 - */ - -#include <stdlib.h> -#include <string.h> - -#include "common.h" -#include "dhcpd.h" -#include "options.h" -#include "files.h" - - -/* supported options are easily added here */ -struct dhcp_option dhcp_options[] = { - /* name[10] flags code */ - {"subnet", OPTION_IP | OPTION_REQ, 0x01}, - {"timezone", OPTION_S32, 0x02}, - {"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03}, - {"timesvr", OPTION_IP | OPTION_LIST, 0x04}, - {"namesvr", OPTION_IP | OPTION_LIST, 0x05}, - {"dns", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06}, - {"logsvr", OPTION_IP | OPTION_LIST, 0x07}, - {"cookiesvr", OPTION_IP | OPTION_LIST, 0x08}, - {"lprsvr", OPTION_IP | OPTION_LIST, 0x09}, - {"hostname", OPTION_STRING | OPTION_REQ, 0x0c}, - {"bootsize", OPTION_U16, 0x0d}, - {"domain", OPTION_STRING | OPTION_REQ, 0x0f}, - {"swapsvr", OPTION_IP, 0x10}, - {"rootpath", OPTION_STRING, 0x11}, - {"ipttl", OPTION_U8, 0x17}, - {"mtu", OPTION_U16, 0x1a}, - {"broadcast", OPTION_IP | OPTION_REQ, 0x1c}, - {"nisdomain", OPTION_STRING | OPTION_REQ, 0x28}, - {"nissrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x29}, - {"ntpsrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a}, - {"wins", OPTION_IP | OPTION_LIST, 0x2c}, - {"requestip", OPTION_IP, 0x32}, - {"lease", OPTION_U32, 0x33}, - {"dhcptype", OPTION_U8, 0x35}, - {"serverid", OPTION_IP, 0x36}, - {"message", OPTION_STRING, 0x38}, - {"tftp", OPTION_STRING, 0x42}, - {"bootfile", OPTION_STRING, 0x43}, - {"", 0x00, 0x00} -}; - -/* Lengths of the different option types */ -int option_lengths[] = { - [OPTION_IP] = 4, - [OPTION_IP_PAIR] = 8, - [OPTION_BOOLEAN] = 1, - [OPTION_STRING] = 1, - [OPTION_U8] = 1, - [OPTION_U16] = 2, - [OPTION_S16] = 2, - [OPTION_U32] = 4, - [OPTION_S32] = 4 -}; - - -/* get an option with bounds checking (warning, not aligned). */ -uint8_t *get_option(struct dhcpMessage *packet, int code) -{ - int i, length; - uint8_t *optionptr; - int over = 0, done = 0, curr = OPTION_FIELD; - - optionptr = packet->options; - i = 0; - length = 308; - while (!done) { - if (i >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); - return NULL; - } - if (optionptr[i + OPT_CODE] == code) { - if (i + 1 + optionptr[i + OPT_LEN] >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); - return NULL; - } - return optionptr + i + 2; - } - switch (optionptr[i + OPT_CODE]) { - case DHCP_PADDING: - i++; - break; - case DHCP_OPTION_OVER: - if (i + 1 + optionptr[i + OPT_LEN] >= length) { - LOG(LOG_WARNING, "bogus packet, option fields too long."); - return NULL; - } - over = optionptr[i + 3]; - i += optionptr[OPT_LEN] + 2; - break; - case DHCP_END: - if (curr == OPTION_FIELD && over & FILE_FIELD) { - optionptr = packet->file; - i = 0; - length = 128; - curr = FILE_FIELD; - } else if (curr == FILE_FIELD && over & SNAME_FIELD) { - optionptr = packet->sname; - i = 0; - length = 64; - curr = SNAME_FIELD; - } else done = 1; - break; - default: - i += optionptr[OPT_LEN + i] + 2; - } - } - return NULL; -} - - -/* return the position of the 'end' option (no bounds checking) */ -int end_option(uint8_t *optionptr) -{ - int i = 0; - - while (optionptr[i] != DHCP_END) { - if (optionptr[i] == DHCP_PADDING) i++; - else i += optionptr[i + OPT_LEN] + 2; - } - return i; -} - - -/* add an option string to the options (an option string contains an option code, - * length, then data) */ -int add_option_string(uint8_t *optionptr, uint8_t *string) -{ - int end = end_option(optionptr); - - /* end position + string length + option code/length + end option */ - if (end + string[OPT_LEN] + 2 + 1 >= 308) { - LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!", string[OPT_CODE]); - return 0; - } - DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]); - memcpy(optionptr + end, string, string[OPT_LEN] + 2); - optionptr[end + string[OPT_LEN] + 2] = DHCP_END; - return string[OPT_LEN] + 2; -} - - -/* add a one to four byte option to a packet */ -int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) -{ - struct dhcp_option *dh; - - for (dh=dhcp_options; dh->code; dh++) { - if (dh->code == code) { - uint8_t option[6], len; - - option[OPT_CODE] = code; - len = option_lengths[dh->flags & TYPE_MASK]; - option[OPT_LEN] = len; - if (__BYTE_ORDER == __BIG_ENDIAN) - data <<= 8 * (4 - len); - /* This memcpy is for broken processors which can't - * handle a simple unaligned 32-bit assignment */ - memcpy(&option[OPT_DATA], &data, 4); - return add_option_string(optionptr, option); - } - } - - DEBUG(LOG_ERR, "Could not add option 0x%02x", code); - return 0; -} |