sbin/dhclient/options.c

1 /*	$OpenBSD: options.c,v 1.15 2004/12/26 03:17:07 deraadt Exp $	*/
3 /* DHCP options parsing and reassembly. */
44 __FBSDID("$FreeBSD: releng/10.2/sbin/dhclient/options.c 229778 2012-01-07 16:09:33Z uqs $");
65  * Parse all available options out of the specified packet.
71 	memset(packet->options, 0, sizeof(packet->options));
74 	if (memcmp(packet->raw->options, DHCP_OPTIONS_COOKIE, 4)) {
80 	 * Go through the options field, up to the end of the packet or
83 	parse_option_buffer(packet, &packet->raw->options[4],
88 	 * options out of the buffer(s) containing them.
91 	    packet->options[DHO_DHCP_OPTION_OVERLOAD].data) {
92 		if (packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1)
96 		if (packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2)
109  * Parse options out of the specified buffer, storing addresses of
110  * option values in packet->options and setting packet->options_valid if
123 		/* Pad options don't have a length - just skip them. */
156 				warning("Many bogus options seen in offers. "
158 				    "options - hope for the best!");
169 		if (!packet->options[code].data) {
179 			packet->options[code].len = len;
180 			packet->options[code].data = t;
187 			t = calloc(1, len + packet->options[code].len + 1);
191 			memcpy(t, packet->options[code].data,
192 				packet->options[code].len);
193 			memcpy(t + packet->options[code].len,
195 			packet->options[code].len += len;
196 			t[packet->options[code].len] = 0;
197 			free(packet->options[code].data);
198 			packet->options[code].data = t;
218 	if (packet->options[DHO_DOMAIN_SEARCH].data == NULL)
221 	option = &packet->options[DHO_DOMAIN_SEARCH];
371  * cons options into a big buffer, and then split them out into the
373  * vendor options using the same routine.
377     int mms, struct tree_cache **options,
395 	    inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].data &&
396 	    (inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].len >=
399 		    inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].data);
411 	/* Preload the option priority list with mandatory options. */
419 	 * If the client has provided a list of options that it wishes
424 	    inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].data) {
426 		    inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].len;
431 		    inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].data,
449 	/* Copy the options into the big buffer... */
454 	    options, priority_list, priority_len, main_buffer_size,
459 	memcpy(outpacket->options, DHCP_OPTIONS_COOKIE, 4);
468 		memcpy(&outpacket->options[mainbufix],
472 			outpacket->options[mainbufix++] = DHO_END;
475 		outpacket->options[mainbufix++] = DHO_DHCP_OPTION_OVERLOAD;
476 		outpacket->options[mainbufix++] = 1;
479 			outpacket->options[mainbufix++] = 3;
481 			outpacket->options[mainbufix++] = 1;
483 		memcpy(&outpacket->options[mainbufix],
517  * Store all the requested options into the requested buffer.
520 store_options(unsigned char *buffer, int buflen, struct tree_cache **options,
530 	 * Copy out the options in the order that they appear in the
545 		if (!options[code]) {
558 		length = options[code]->len;
608 				    options[code]->value + ix, incr - 1);
612 				    options[code]->value + ix, incr);
883 	    tp.options[DHO_DHCP_MESSAGE_TYPE].data)
884 		tp.packet_type = tp.options[DHO_DHCP_MESSAGE_TYPE].data[0];
890 	/* Free the data associated with the options. */
892 		if (tp.options[i].len && tp.options[i].data)
893 			free(tp.options[i].data);