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-rw-r--r--sbin/dhclient/options.c717
1 files changed, 0 insertions, 717 deletions
diff --git a/sbin/dhclient/options.c b/sbin/dhclient/options.c
deleted file mode 100644
index 9c8e8fc743f1a..0000000000000
--- a/sbin/dhclient/options.c
+++ /dev/null
@@ -1,717 +0,0 @@
-/* $OpenBSD: options.c,v 1.15 2004/12/26 03:17:07 deraadt Exp $ */
-
-/* DHCP options parsing and reassembly. */
-
-/*
- * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of The Internet Software Consortium nor the names
- * of its contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
- * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * This software has been written for the Internet Software Consortium
- * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
- * Enterprises. To learn more about the Internet Software Consortium,
- * see ``http://www.vix.com/isc''. To learn more about Vixie
- * Enterprises, see ``http://www.vix.com''.
- */
-
-#include <ctype.h>
-
-#define DHCP_OPTION_DATA
-#include "dhcpd.h"
-
-int bad_options = 0;
-int bad_options_max = 5;
-
-void parse_options(struct packet *);
-void parse_option_buffer(struct packet *, unsigned char *, int);
-int store_options(unsigned char *, int, struct tree_cache **,
- unsigned char *, int, int, int, int);
-
-
-/*
- * Parse all available options out of the specified packet.
- */
-void
-parse_options(struct packet *packet)
-{
- /* Initially, zero all option pointers. */
- memset(packet->options, 0, sizeof(packet->options));
-
- /* If we don't see the magic cookie, there's nothing to parse. */
- if (memcmp(packet->raw->options, DHCP_OPTIONS_COOKIE, 4)) {
- packet->options_valid = 0;
- return;
- }
-
- /*
- * Go through the options field, up to the end of the packet or
- * the End field.
- */
- parse_option_buffer(packet, &packet->raw->options[4],
- packet->packet_length - DHCP_FIXED_NON_UDP - 4);
-
- /*
- * If we parsed a DHCP Option Overload option, parse more
- * options out of the buffer(s) containing them.
- */
- if (packet->options_valid &&
- packet->options[DHO_DHCP_OPTION_OVERLOAD].data) {
- if (packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1)
- parse_option_buffer(packet,
- (unsigned char *)packet->raw->file,
- sizeof(packet->raw->file));
- if (packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2)
- parse_option_buffer(packet,
- (unsigned char *)packet->raw->sname,
- sizeof(packet->raw->sname));
- }
-}
-
-/*
- * Parse options out of the specified buffer, storing addresses of
- * option values in packet->options and setting packet->options_valid if
- * no errors are encountered.
- */
-void
-parse_option_buffer(struct packet *packet,
- unsigned char *buffer, int length)
-{
- unsigned char *s, *t, *end = buffer + length;
- int len, code;
-
- for (s = buffer; *s != DHO_END && s < end; ) {
- code = s[0];
-
- /* Pad options don't have a length - just skip them. */
- if (code == DHO_PAD) {
- s++;
- continue;
- }
- if (s + 2 > end) {
- len = 65536;
- goto bogus;
- }
-
- /*
- * All other fields (except end, see above) have a
- * one-byte length.
- */
- len = s[1];
-
- /*
- * If the length is outrageous, silently skip the rest,
- * and mark the packet bad. Unfortunately some crappy
- * dhcp servers always seem to give us garbage on the
- * end of a packet. so rather than keep refusing, give
- * up and try to take one after seeing a few without
- * anything good.
- */
- if (s + len + 2 > end) {
- bogus:
- bad_options++;
- warning("option %s (%d) %s.",
- dhcp_options[code].name, len,
- "larger than buffer");
- if (bad_options == bad_options_max) {
- packet->options_valid = 1;
- bad_options = 0;
- warning("Many bogus options seen in offers. "
- "Taking this offer in spite of bogus "
- "options - hope for the best!");
- } else {
- warning("rejecting bogus offer.");
- packet->options_valid = 0;
- }
- return;
- }
- /*
- * If we haven't seen this option before, just make
- * space for it and copy it there.
- */
- if (!packet->options[code].data) {
- if (!(t = calloc(1, len + 1)))
- error("Can't allocate storage for option %s.",
- dhcp_options[code].name);
- /*
- * Copy and NUL-terminate the option (in case
- * it's an ASCII string.
- */
- memcpy(t, &s[2], len);
- t[len] = 0;
- packet->options[code].len = len;
- packet->options[code].data = t;
- } else {
- /*
- * If it's a repeat, concatenate it to whatever
- * we last saw. This is really only required
- * for clients, but what the heck...
- */
- t = calloc(1, len + packet->options[code].len + 1);
- if (!t)
- error("Can't expand storage for option %s.",
- dhcp_options[code].name);
- memcpy(t, packet->options[code].data,
- packet->options[code].len);
- memcpy(t + packet->options[code].len,
- &s[2], len);
- packet->options[code].len += len;
- t[packet->options[code].len] = 0;
- free(packet->options[code].data);
- packet->options[code].data = t;
- }
- s += len + 2;
- }
- packet->options_valid = 1;
-}
-
-/*
- * cons options into a big buffer, and then split them out into the
- * three separate buffers if needed. This allows us to cons up a set of
- * vendor options using the same routine.
- */
-int
-cons_options(struct packet *inpacket, struct dhcp_packet *outpacket,
- int mms, struct tree_cache **options,
- int overload, /* Overload flags that may be set. */
- int terminate, int bootpp, u_int8_t *prl, int prl_len)
-{
- unsigned char priority_list[300], buffer[4096];
- int priority_len, main_buffer_size, mainbufix, bufix;
- int option_size, length;
-
- /*
- * If the client has provided a maximum DHCP message size, use
- * that; otherwise, if it's BOOTP, only 64 bytes; otherwise use
- * up to the minimum IP MTU size (576 bytes).
- *
- * XXX if a BOOTP client specifies a max message size, we will
- * honor it.
- */
- if (!mms &&
- inpacket &&
- inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].data &&
- (inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].len >=
- sizeof(u_int16_t)))
- mms = getUShort(
- inpacket->options[DHO_DHCP_MAX_MESSAGE_SIZE].data);
-
- if (mms)
- main_buffer_size = mms - DHCP_FIXED_LEN;
- else if (bootpp)
- main_buffer_size = 64;
- else
- main_buffer_size = 576 - DHCP_FIXED_LEN;
-
- if (main_buffer_size > sizeof(buffer))
- main_buffer_size = sizeof(buffer);
-
- /* Preload the option priority list with mandatory options. */
- priority_len = 0;
- priority_list[priority_len++] = DHO_DHCP_MESSAGE_TYPE;
- priority_list[priority_len++] = DHO_DHCP_SERVER_IDENTIFIER;
- priority_list[priority_len++] = DHO_DHCP_LEASE_TIME;
- priority_list[priority_len++] = DHO_DHCP_MESSAGE;
-
- /*
- * If the client has provided a list of options that it wishes
- * returned, use it to prioritize. Otherwise, prioritize based
- * on the default priority list.
- */
- if (inpacket &&
- inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].data) {
- int prlen =
- inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].len;
- if (prlen + priority_len > sizeof(priority_list))
- prlen = sizeof(priority_list) - priority_len;
-
- memcpy(&priority_list[priority_len],
- inpacket->options[DHO_DHCP_PARAMETER_REQUEST_LIST].data,
- prlen);
- priority_len += prlen;
- prl = priority_list;
- } else if (prl) {
- if (prl_len + priority_len > sizeof(priority_list))
- prl_len = sizeof(priority_list) - priority_len;
-
- memcpy(&priority_list[priority_len], prl, prl_len);
- priority_len += prl_len;
- prl = priority_list;
- } else {
- memcpy(&priority_list[priority_len],
- dhcp_option_default_priority_list,
- sizeof_dhcp_option_default_priority_list);
- priority_len += sizeof_dhcp_option_default_priority_list;
- }
-
- /* Copy the options into the big buffer... */
- option_size = store_options(
- buffer,
- (main_buffer_size - 7 + ((overload & 1) ? DHCP_FILE_LEN : 0) +
- ((overload & 2) ? DHCP_SNAME_LEN : 0)),
- options, priority_list, priority_len, main_buffer_size,
- (main_buffer_size + ((overload & 1) ? DHCP_FILE_LEN : 0)),
- terminate);
-
- /* Put the cookie up front... */
- memcpy(outpacket->options, DHCP_OPTIONS_COOKIE, 4);
- mainbufix = 4;
-
- /*
- * If we're going to have to overload, store the overload option
- * at the beginning. If we can, though, just store the whole
- * thing in the packet's option buffer and leave it at that.
- */
- if (option_size <= main_buffer_size - mainbufix) {
- memcpy(&outpacket->options[mainbufix],
- buffer, option_size);
- mainbufix += option_size;
- if (mainbufix < main_buffer_size)
- outpacket->options[mainbufix++] = DHO_END;
- length = DHCP_FIXED_NON_UDP + mainbufix;
- } else {
- outpacket->options[mainbufix++] = DHO_DHCP_OPTION_OVERLOAD;
- outpacket->options[mainbufix++] = 1;
- if (option_size >
- main_buffer_size - mainbufix + DHCP_FILE_LEN)
- outpacket->options[mainbufix++] = 3;
- else
- outpacket->options[mainbufix++] = 1;
-
- memcpy(&outpacket->options[mainbufix],
- buffer, main_buffer_size - mainbufix);
- bufix = main_buffer_size - mainbufix;
- length = DHCP_FIXED_NON_UDP + mainbufix;
- if (overload & 1) {
- if (option_size - bufix <= DHCP_FILE_LEN) {
- memcpy(outpacket->file,
- &buffer[bufix], option_size - bufix);
- mainbufix = option_size - bufix;
- if (mainbufix < DHCP_FILE_LEN)
- outpacket->file[mainbufix++] = (char)DHO_END;
- while (mainbufix < DHCP_FILE_LEN)
- outpacket->file[mainbufix++] = (char)DHO_PAD;
- } else {
- memcpy(outpacket->file,
- &buffer[bufix], DHCP_FILE_LEN);
- bufix += DHCP_FILE_LEN;
- }
- }
- if ((overload & 2) && option_size < bufix) {
- memcpy(outpacket->sname,
- &buffer[bufix], option_size - bufix);
-
- mainbufix = option_size - bufix;
- if (mainbufix < DHCP_SNAME_LEN)
- outpacket->file[mainbufix++] = (char)DHO_END;
- while (mainbufix < DHCP_SNAME_LEN)
- outpacket->file[mainbufix++] = (char)DHO_PAD;
- }
- }
- return (length);
-}
-
-/*
- * Store all the requested options into the requested buffer.
- */
-int
-store_options(unsigned char *buffer, int buflen, struct tree_cache **options,
- unsigned char *priority_list, int priority_len, int first_cutoff,
- int second_cutoff, int terminate)
-{
- int bufix = 0, option_stored[256], i, ix, tto;
-
- /* Zero out the stored-lengths array. */
- memset(option_stored, 0, sizeof(option_stored));
-
- /*
- * Copy out the options in the order that they appear in the
- * priority list...
- */
- for (i = 0; i < priority_len; i++) {
- /* Code for next option to try to store. */
- int code = priority_list[i];
- int optstart;
-
- /*
- * Number of bytes left to store (some may already have
- * been stored by a previous pass).
- */
- int length;
-
- /* If no data is available for this option, skip it. */
- if (!options[code]) {
- continue;
- }
-
- /*
- * The client could ask for things that are mandatory,
- * in which case we should avoid storing them twice...
- */
- if (option_stored[code])
- continue;
- option_stored[code] = 1;
-
- /* We should now have a constant length for the option. */
- length = options[code]->len;
-
- /* Do we add a NUL? */
- if (terminate && dhcp_options[code].format[0] == 't') {
- length++;
- tto = 1;
- } else
- tto = 0;
-
- /* Try to store the option. */
-
- /*
- * If the option's length is more than 255, we must
- * store it in multiple hunks. Store 255-byte hunks
- * first. However, in any case, if the option data will
- * cross a buffer boundary, split it across that
- * boundary.
- */
- ix = 0;
-
- optstart = bufix;
- while (length) {
- unsigned char incr = length > 255 ? 255 : length;
-
- /*
- * If this hunk of the buffer will cross a
- * boundary, only go up to the boundary in this
- * pass.
- */
- if (bufix < first_cutoff &&
- bufix + incr > first_cutoff)
- incr = first_cutoff - bufix;
- else if (bufix < second_cutoff &&
- bufix + incr > second_cutoff)
- incr = second_cutoff - bufix;
-
- /*
- * If this option is going to overflow the
- * buffer, skip it.
- */
- if (bufix + 2 + incr > buflen) {
- bufix = optstart;
- break;
- }
-
- /* Everything looks good - copy it in! */
- buffer[bufix] = code;
- buffer[bufix + 1] = incr;
- if (tto && incr == length) {
- memcpy(buffer + bufix + 2,
- options[code]->value + ix, incr - 1);
- buffer[bufix + 2 + incr - 1] = 0;
- } else
- memcpy(buffer + bufix + 2,
- options[code]->value + ix, incr);
- length -= incr;
- ix += incr;
- bufix += 2 + incr;
- }
- }
- return (bufix);
-}
-
-/*
- * Format the specified option so that a human can easily read it.
- */
-char *
-pretty_print_option(unsigned int code, unsigned char *data, int len,
- int emit_commas, int emit_quotes)
-{
- static char optbuf[32768]; /* XXX */
- int hunksize = 0, numhunk = -1, numelem = 0;
- char fmtbuf[32], *op = optbuf;
- int i, j, k, opleft = sizeof(optbuf);
- unsigned char *dp = data;
- struct in_addr foo;
- char comma;
-
- /* Code should be between 0 and 255. */
- if (code > 255)
- error("pretty_print_option: bad code %d", code);
-
- if (emit_commas)
- comma = ',';
- else
- comma = ' ';
-
- /* Figure out the size of the data. */
- for (i = 0; dhcp_options[code].format[i]; i++) {
- if (!numhunk) {
- warning("%s: Excess information in format string: %s",
- dhcp_options[code].name,
- &(dhcp_options[code].format[i]));
- break;
- }
- numelem++;
- fmtbuf[i] = dhcp_options[code].format[i];
- switch (dhcp_options[code].format[i]) {
- case 'A':
- --numelem;
- fmtbuf[i] = 0;
- numhunk = 0;
- break;
- case 'X':
- for (k = 0; k < len; k++)
- if (!isascii(data[k]) ||
- !isprint(data[k]))
- break;
- if (k == len) {
- fmtbuf[i] = 't';
- numhunk = -2;
- } else {
- fmtbuf[i] = 'x';
- hunksize++;
- comma = ':';
- numhunk = 0;
- }
- fmtbuf[i + 1] = 0;
- break;
- case 't':
- fmtbuf[i] = 't';
- fmtbuf[i + 1] = 0;
- numhunk = -2;
- break;
- case 'I':
- case 'l':
- case 'L':
- hunksize += 4;
- break;
- case 's':
- case 'S':
- hunksize += 2;
- break;
- case 'b':
- case 'B':
- case 'f':
- hunksize++;
- break;
- case 'e':
- break;
- default:
- warning("%s: garbage in format string: %s",
- dhcp_options[code].name,
- &(dhcp_options[code].format[i]));
- break;
- }
- }
-
- /* Check for too few bytes... */
- if (hunksize > len) {
- warning("%s: expecting at least %d bytes; got %d",
- dhcp_options[code].name, hunksize, len);
- return ("<error>");
- }
- /* Check for too many bytes... */
- if (numhunk == -1 && hunksize < len)
- warning("%s: %d extra bytes",
- dhcp_options[code].name, len - hunksize);
-
- /* If this is an array, compute its size. */
- if (!numhunk)
- numhunk = len / hunksize;
- /* See if we got an exact number of hunks. */
- if (numhunk > 0 && numhunk * hunksize < len)
- warning("%s: %d extra bytes at end of array",
- dhcp_options[code].name, len - numhunk * hunksize);
-
- /* A one-hunk array prints the same as a single hunk. */
- if (numhunk < 0)
- numhunk = 1;
-
- /* Cycle through the array (or hunk) printing the data. */
- for (i = 0; i < numhunk; i++) {
- for (j = 0; j < numelem; j++) {
- int opcount;
- switch (fmtbuf[j]) {
- case 't':
- if (emit_quotes) {
- *op++ = '"';
- opleft--;
- }
- for (; dp < data + len; dp++) {
- if (!isascii(*dp) ||
- !isprint(*dp)) {
- if (dp + 1 != data + len ||
- *dp != 0) {
- snprintf(op, opleft,
- "\\%03o", *dp);
- op += 4;
- opleft -= 4;
- }
- } else if (*dp == '"' ||
- *dp == '\'' ||
- *dp == '$' ||
- *dp == '`' ||
- *dp == '\\') {
- *op++ = '\\';
- *op++ = *dp;
- opleft -= 2;
- } else {
- *op++ = *dp;
- opleft--;
- }
- }
- if (emit_quotes) {
- *op++ = '"';
- opleft--;
- }
-
- *op = 0;
- break;
- case 'I':
- foo.s_addr = htonl(getULong(dp));
- opcount = strlcpy(op, inet_ntoa(foo), opleft);
- if (opcount >= opleft)
- goto toobig;
- opleft -= opcount;
- dp += 4;
- break;
- case 'l':
- opcount = snprintf(op, opleft, "%ld",
- (long)getLong(dp));
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- dp += 4;
- break;
- case 'L':
- opcount = snprintf(op, opleft, "%ld",
- (unsigned long)getULong(dp));
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- dp += 4;
- break;
- case 's':
- opcount = snprintf(op, opleft, "%d",
- getShort(dp));
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- dp += 2;
- break;
- case 'S':
- opcount = snprintf(op, opleft, "%d",
- getUShort(dp));
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- dp += 2;
- break;
- case 'b':
- opcount = snprintf(op, opleft, "%d",
- *(char *)dp++);
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- break;
- case 'B':
- opcount = snprintf(op, opleft, "%d", *dp++);
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- break;
- case 'x':
- opcount = snprintf(op, opleft, "%x", *dp++);
- if (opcount >= opleft || opcount == -1)
- goto toobig;
- opleft -= opcount;
- break;
- case 'f':
- opcount = strlcpy(op,
- *dp++ ? "true" : "false", opleft);
- if (opcount >= opleft)
- goto toobig;
- opleft -= opcount;
- break;
- default:
- warning("Unexpected format code %c", fmtbuf[j]);
- }
- op += strlen(op);
- opleft -= strlen(op);
- if (opleft < 1)
- goto toobig;
- if (j + 1 < numelem && comma != ':') {
- *op++ = ' ';
- opleft--;
- }
- }
- if (i + 1 < numhunk) {
- *op++ = comma;
- opleft--;
- }
- if (opleft < 1)
- goto toobig;
-
- }
- return (optbuf);
- toobig:
- warning("dhcp option too large");
- return ("<error>");
-}
-
-void
-do_packet(struct interface_info *interface, struct dhcp_packet *packet,
- int len, unsigned int from_port, struct iaddr from, struct hardware *hfrom)
-{
- struct packet tp;
- int i;
-
- if (packet->hlen > sizeof(packet->chaddr)) {
- note("Discarding packet with invalid hlen.");
- return;
- }
-
- memset(&tp, 0, sizeof(tp));
- tp.raw = packet;
- tp.packet_length = len;
- tp.client_port = from_port;
- tp.client_addr = from;
- tp.interface = interface;
- tp.haddr = hfrom;
-
- parse_options(&tp);
- if (tp.options_valid &&
- tp.options[DHO_DHCP_MESSAGE_TYPE].data)
- tp.packet_type = tp.options[DHO_DHCP_MESSAGE_TYPE].data[0];
- if (tp.packet_type)
- dhcp(&tp);
- else
- bootp(&tp);
-
- /* Free the data associated with the options. */
- for (i = 0; i < 256; i++)
- if (tp.options[i].len && tp.options[i].data)
- free(tp.options[i].data);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-15 04:53:31 +0000