2 * dovend.c : Inserts all but the first few vendor options.
4 * $FreeBSD: src/libexec/bootpd/dovend.c,v 1.5.2.1 2003/02/15 05:36:01 kris Exp $
9 #include <netinet/in.h>
10 #include <arpa/inet.h> /* inet_ntoa */
20 /* Yes, memcpy is OK here (no overlapped copies). */
21 # define bcopy(a,b,c) memcpy(b,a,c)
22 # define bzero(p,l) memset(p,0,l)
23 # define bcmp(a,b,c) memcmp(a,b,c)
32 PRIVATE int insert_generic(struct shared_bindata *, byte **, int *);
35 * Insert the 2nd part of the options into an option buffer.
36 * Return amount of space used.
38 * This inserts everything EXCEPT:
39 * magic cookie, subnet mask, gateway, bootsize, extension file
40 * Those are handled separately (in bootpd.c) to allow this function
41 * to be shared between bootpd and bootpef.
43 * When an "extension file" is in use, the options inserted by
44 * this function go into the exten_file, not the bootp response.
48 dovend_rfc1497(struct host *hp, byte *buf, int len)
53 static const char noroom[] = "%s: No room for \"%s\" option";
54 #define NEED(LEN, MSG) do \
55 if (bytesleft < (LEN)) { \
56 report(LOG_NOTICE, noroom, \
57 hp->hostname->string, MSG); \
62 * Note that the following have already been inserted:
63 * magic_cookie, subnet_mask, gateway, bootsize
65 * The remaining options are inserted in order of importance.
66 * (Of course the importance of each is a matter of opinion.)
67 * The option insertion order should probably be configurable.
69 * This is the order used in the NetBSD version. Can anyone
70 * explain why the time_offset and swap_server are first?
71 * Also, why is the hostname so far down the list? -gwr
74 if (hp->flags.time_offset) {
76 *vp++ = TAG_TIME_OFFSET;/* -1 byte */
77 *vp++ = 4; /* -1 byte */
78 insert_u_long(htonl(hp->time_offset), &vp); /* -4 bytes */
82 * swap server, root path, dump path
84 if (hp->flags.swap_server) {
86 /* There is just one SWAP_SERVER, so it is not an iplist. */
87 *vp++ = TAG_SWAP_SERVER;/* -1 byte */
88 *vp++ = 4; /* -1 byte */
89 insert_u_long(hp->swap_server.s_addr, &vp); /* -4 bytes */
90 bytesleft -= 6; /* Fix real count */
92 if (hp->flags.root_path) {
94 * Check for room for root_path. Add 2 to account for
95 * TAG_ROOT_PATH and length.
97 len = strlen(hp->root_path->string);
98 NEED((len + 2), "rp");
99 *vp++ = TAG_ROOT_PATH;
100 *vp++ = (byte) (len & 0xFF);
101 bcopy(hp->root_path->string, vp, len);
103 bytesleft -= len + 2;
105 if (hp->flags.dump_file) {
107 * Check for room for dump_file. Add 2 to account for
108 * TAG_DUMP_FILE and length.
110 len = strlen(hp->dump_file->string);
111 NEED((len + 2), "df");
112 *vp++ = TAG_DUMP_FILE;
113 *vp++ = (byte) (len & 0xFF);
114 bcopy(hp->dump_file->string, vp, len);
116 bytesleft -= len + 2;
119 * DNS server and domain
121 if (hp->flags.domain_server) {
122 if (insert_ip(TAG_DOMAIN_SERVER,
127 if (hp->flags.domain_name) {
129 * Check for room for domain_name. Add 2 to account for
130 * TAG_DOMAIN_NAME and length.
132 len = strlen(hp->domain_name->string);
133 NEED((len + 2), "dn");
134 *vp++ = TAG_DOMAIN_NAME;
135 *vp++ = (byte) (len & 0xFF);
136 bcopy(hp->domain_name->string, vp, len);
138 bytesleft -= len + 2;
141 * NIS (YP) server and domain
143 if (hp->flags.nis_server) {
144 if (insert_ip(TAG_NIS_SERVER,
149 if (hp->flags.nis_domain) {
151 * Check for room for nis_domain. Add 2 to account for
152 * TAG_NIS_DOMAIN and length.
154 len = strlen(hp->nis_domain->string);
155 NEED((len + 2), "dn");
156 *vp++ = TAG_NIS_DOMAIN;
157 *vp++ = (byte) (len & 0xFF);
158 bcopy(hp->nis_domain->string, vp, len);
160 bytesleft -= len + 2;
162 /* IEN 116 name server */
163 if (hp->flags.name_server) {
164 if (insert_ip(TAG_NAME_SERVER,
169 if (hp->flags.rlp_server) {
170 if (insert_ip(TAG_RLP_SERVER,
175 /* Time server (RFC 868) */
176 if (hp->flags.time_server) {
177 if (insert_ip(TAG_TIME_SERVER,
182 /* NTP (time) Server (RFC 1129) */
183 if (hp->flags.ntp_server) {
184 if (insert_ip(TAG_NTP_SERVER,
190 * I wonder: If the hostname were "promoted" into the BOOTP
191 * response part, might these "extension" files possibly be
192 * shared between several clients?
194 * Also, why not just use longer BOOTP packets with all the
195 * additional length used as option data. This bootpd version
196 * already supports that feature by replying with the same
197 * packet length as the client request packet. -gwr
199 if (hp->flags.name_switch && hp->flags.send_name) {
201 * Check for room for hostname. Add 2 to account for
202 * TAG_HOST_NAME and length.
204 len = strlen(hp->hostname->string);
207 * XXX - Too much magic. The user can always set the hostname
208 * to the short version in the bootptab file. -gwr
210 if ((len + 2) > bytesleft) {
212 * Not enough room for full (domain-qualified) hostname, try
213 * stripping it down to just the first field (host).
215 char *tmpstr = hp->hostname->string;
217 while (*tmpstr && (*tmpstr != '.')) {
223 NEED((len + 2), "hn");
224 *vp++ = TAG_HOST_NAME;
225 *vp++ = (byte) (len & 0xFF);
226 bcopy(hp->hostname->string, vp, len);
228 bytesleft -= len + 2;
231 * The rest of these are less important, so they go last.
233 if (hp->flags.lpr_server) {
234 if (insert_ip(TAG_LPR_SERVER,
239 if (hp->flags.cookie_server) {
240 if (insert_ip(TAG_COOKIE_SERVER,
245 if (hp->flags.log_server) {
246 if (insert_ip(TAG_LOG_SERVER,
252 * XXX - Add new tags here (to insert options)
254 if (hp->flags.generic) {
255 if (insert_generic(hp->generic, &vp, &bytesleft))
256 NEED(64, "(generic)");
259 * The end marker is inserted by the caller.
263 } /* dovend_rfc1497 */
268 * Insert a tag value, a length value, and a list of IP addresses into the
269 * memory buffer indirectly pointed to by "dest". "tag" is the RFC1048 tag
270 * number to use, "iplist" is a pointer to a list of IP addresses
271 * (struct in_addr_list), and "bytesleft" points to an integer which
272 * indicates the size of the "dest" buffer.
274 * Return zero if everything fits.
276 * This is used to fill the vendor-specific area of a bootp packet in
277 * conformance to RFC1048.
281 insert_ip(byte tag, struct in_addr_list *iplist, byte **dest, int *bytesleft)
283 struct in_addr *addrptr;
284 unsigned addrcount = 1;
290 if (*bytesleft >= 6) {
291 d = *dest; /* Save pointer for later */
294 (*bytesleft) -= 2; /* Account for tag and length */
295 addrptr = iplist->addr;
296 addrcount = iplist->addrcount;
297 while ((*bytesleft >= 4) && (addrcount > 0)) {
298 insert_u_long(addrptr->s_addr, dest);
301 (*bytesleft) -= 4; /* Four bytes per address */
303 d[1] = (byte) ((*dest - d - 2) & 0xFF);
311 * Insert generic data into a bootp packet. The data is assumed to already
312 * be in RFC1048 format. It is inserted using a first-fit algorithm which
313 * attempts to insert as many tags as possible. Tags and data which are
314 * too large to fit are skipped; any remaining tags are tried until they
315 * have all been exhausted.
316 * Return zero if everything fits.
320 insert_generic(struct shared_bindata *gendata, byte **buff, int *bytesleft)
323 int length, numbytes;
329 srcptr = gendata->data;
330 length = gendata->length;
331 while ((length > 0) && (*bytesleft > 0)) {
334 length = 0; /* Force an exit on next iteration */
337 *(*buff)++ = *srcptr++;
342 numbytes = srcptr[1] + 2;
343 if (*bytesleft < numbytes)
346 bcopy(srcptr, *buff, numbytes);
348 (*bytesleft) -= numbytes;
359 * Insert the unsigned long "value" into memory starting at the byte
360 * pointed to by the byte pointer (*dest). (*dest) is updated to
361 * point to the next available byte.
363 * Since it is desirable to internally store network addresses in network
364 * byte order (in struct in_addr's), this routine expects longs to be
365 * passed in network byte order.
367 * However, due to the nature of the main algorithm, the long must be in
368 * host byte order, thus necessitating the use of ntohl() first.
372 insert_u_long(u_int32 value, byte **dest)
377 value = ntohl(value); /* Must use host byte order here */
379 for (n = 4; n > 0; n--) {
380 *--temp = (byte) (value & 0xFF);
383 /* Final result is network byte order */