[unix-history] / usr / src / lib / libc / net / res_mkquery.c

/*	res_mkquery.c	4.1	85/03/01	*/

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <nameser.h>
#include <resolv.h>

/*
 * Form all types of queries.
 * Returns the size of the result or -1.
 */
mkquery(op, dname, class, type, data, datalen, newrr, buf, buflen)
	int op;			/* opcode of query */
	char *dname;		/* domain name */
	int class, type;	/* class and type of query */
	char *data;		/* resource record data */
	int datalen;		/* length of data */
	struct rrec *newrr;	/* new rr for modify or append */
	char *buf;		/* buffer to put query */
	int buflen;		/* size of buffer */
{
	register HEADER *hp;
	register char *cp;
	register int n;
	char dnbuf[MAXDNAME];
	char *dnptrs[10], **dpp, **lastdnptr;
	extern char *index();

	if (_res.options & RES_DEBUG)
		printf("mkquery(%d, %s, %d, %d)\n", op, dname, class, type);
	/*
	 * Initialize header fields.
	 */
	hp = (HEADER *) buf;
	hp->id = htons(++_res.id);
	hp->opcode = op;
	hp->qr = hp->aa = hp->tc = hp->ra = 0;
	hp->pr = (_res.options & RES_PRIMARY) != 0;
	hp->rd = (_res.options & RES_RECURSE) != 0;
	hp->rcode = NOERROR;
	hp->qdcount = 0;
	hp->ancount = 0;
	hp->nscount = 0;
	hp->arcount = 0;
	cp = buf + sizeof(HEADER);
	buflen -= sizeof(HEADER);
	dpp = dnptrs;
	*dpp++ = buf;
	*dpp++ = NULL;
	lastdnptr = dnptrs + sizeof(dnptrs);
	/*
	 * If the domain name consists of a single label, then
	 * append the default domain name to the one given.
	 */
	if ((_res.options & RES_DEFNAMES) && dname[0] != '\0' &&
	    index(dname, '.') == NULL) {
		if (!(_res.options & RES_INIT))
			res_init();
		if (_res.defdname[0] != '\0')
			dname = sprintf(dnbuf, "%s.%s", dname, _res.defdname);
	}
	/*
	 * perform opcode specific processing
	 */
	switch (op) {
	case QUERY:
	case CQUERYM:
	case CQUERYU:
		buflen -= QFIXEDSZ;
		if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
			return (-1);
		cp += n;
		buflen -= n;
		*((u_short *)cp) = htons(type);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(class);
		cp += sizeof(u_short);
		hp->qdcount = HTONS(1);
		if (op == QUERY || data == NULL)
			break;
		/*
		 * Make an additional record for completion domain.
		 */
		if ((n = dn_comp(data, cp, buflen, dnptrs, lastdnptr)) < 0)
			return (-1);
		cp += n;
		buflen -= n;
		*((u_short *)cp) = htons(T_NULL);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(class);
		cp += sizeof(u_short);
		*((u_long *)cp) = 0;
		cp += sizeof(u_long);
		*((u_short *)cp) = 0;
		cp += sizeof(u_short);
		hp->arcount = HTONS(1);
		break;

	case IQUERY:
		/*
		 * Initialize answer section
		 */
		if (buflen < 1 + RRFIXEDSZ + datalen)
			return (-1);
		*cp++ = '\0';	/* no domain name */
		*((u_short *)cp) = htons(type);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(class);
		cp += sizeof(u_short);
		*((u_long *)cp) = 0;
		cp += sizeof(u_long);
		*((u_short *)cp) = htons(datalen);
		cp += sizeof(u_short);
		if (datalen) {
			bcopy(data, cp, datalen);
			cp += datalen;
		}
		hp->ancount = HTONS(1);
		break;

#ifdef notdef
	case UPDATED:
		/*
		 * Put record to be added or deleted in additional section
		 */
		buflen -= RRFIXEDSZ + datalen;
		if ((n = dn_comp(dname, cp, buflen, NULL, NULL)) < 0)
			return (-1);
		cp += n;
		*((u_short *)cp) = htons(type);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(class);
		cp += sizeof(u_short);
		*((u_long *)cp) = 0;
		cp += sizeof(u_long);
		*((u_short *)cp) = htons(datalen);
		cp += sizeof(u_short);
		if (datalen) {
			bcopy(data, cp, datalen);
			cp += datalen;
		}
		break;

	case UPDATEM:
		/*
		 * Record to be modified followed by its replacement
		 */
		buflen -= RRFIXEDSZ + datalen;
		if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
			return (-1);
		cp += n;
		*((u_short *)cp) = htons(type);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(class);
		cp += sizeof(u_short);
		*((u_long *)cp) = 0;
		cp += sizeof(u_long);
		*((u_short *)cp) = htons(datalen);
		cp += sizeof(u_short);
		if (datalen) {
			bcopy(data, cp, datalen);
			cp += datalen;
		}

	case UPDATEA:
		buflen -= RRFIXEDSZ + newrr->r_size;
		if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
			return (-1);
		cp += n;
		*((u_short *)cp) = htons(newrr->r_type);
		cp += sizeof(u_short);
		*((u_short *)cp) = htons(newrr->r_type);
		cp += sizeof(u_short);
		*((u_long *)cp) = htonl(newrr->r_ttl);
		cp += sizeof(u_long);
		*((u_short *)cp) = htons(newrr->r_size);
		cp += sizeof(u_short);
		if (newrr->r_size) {
			bcopy(newrr->r_data, cp, newrr->r_size);
			cp += newrr->r_size;
		}
		break;
#endif
	}
	return (cp - buf);
}
Commit	Line	Data
5e95d9b7 RC	1	/* res_mkquery.c 4.1 85/03/01 */
	2
	3	#include <stdio.h>
	4	#include <sys/types.h>
	5	#include <netinet/in.h>
	6	#include <nameser.h>
	7	#include <resolv.h>
	8
	9	/*
	10	* Form all types of queries.
	11	* Returns the size of the result or -1.
	12	*/
	13	mkquery(op, dname, class, type, data, datalen, newrr, buf, buflen)
	14	int op; /* opcode of query */
	15	char dname; / domain name */
	16	int class, type; /* class and type of query */
	17	char data; / resource record data */
	18	int datalen; /* length of data */
	19	struct rrec newrr; / new rr for modify or append */
	20	char buf; / buffer to put query */
	21	int buflen; /* size of buffer */
	22	{
	23	register HEADER *hp;
	24	register char *cp;
	25	register int n;
	26	char dnbuf[MAXDNAME];
	27	char dnptrs[10], dpp, *lastdnptr;
	28	extern char *index();
	29
	30	if (_res.options & RES_DEBUG)
	31	printf("mkquery(%d, %s, %d, %d)\n", op, dname, class, type);
	32	/*
	33	* Initialize header fields.
	34	*/
	35	hp = (HEADER *) buf;
	36	hp->id = htons(++_res.id);
	37	hp->opcode = op;
	38	hp->qr = hp->aa = hp->tc = hp->ra = 0;
	39	hp->pr = (_res.options & RES_PRIMARY) != 0;
	40	hp->rd = (_res.options & RES_RECURSE) != 0;
	41	hp->rcode = NOERROR;
	42	hp->qdcount = 0;
	43	hp->ancount = 0;
	44	hp->nscount = 0;
	45	hp->arcount = 0;
	46	cp = buf + sizeof(HEADER);
	47	buflen -= sizeof(HEADER);
	48	dpp = dnptrs;
	49	*dpp++ = buf;
	50	*dpp++ = NULL;
	51	lastdnptr = dnptrs + sizeof(dnptrs);
	52	/*
	53	* If the domain name consists of a single label, then
	54	* append the default domain name to the one given.
	55	*/
	56	if ((_res.options & RES_DEFNAMES) && dname[0] != '\0' &&
	57	index(dname, '.') == NULL) {
	58	if (!(_res.options & RES_INIT))
	59	res_init();
	60	if (_res.defdname[0] != '\0')
	61	dname = sprintf(dnbuf, "%s.%s", dname, _res.defdname);
	62	}
	63	/*
	64	* perform opcode specific processing
65	*/
66	switch (op) {
67	case QUERY:
68	case CQUERYM:
69	case CQUERYU:
70	buflen -= QFIXEDSZ;
71	if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
72	return (-1);
73	cp += n;
74	buflen -= n;
75	((u_short )cp) = htons(type);
76	cp += sizeof(u_short);
77	((u_short )cp) = htons(class);
78	cp += sizeof(u_short);
79	hp->qdcount = HTONS(1);
80	if (op == QUERY \|\| data == NULL)
81	break;
82	/*
83	* Make an additional record for completion domain.
84	*/
85	if ((n = dn_comp(data, cp, buflen, dnptrs, lastdnptr)) < 0)
86	return (-1);
87	cp += n;
88	buflen -= n;
89	((u_short )cp) = htons(T_NULL);
90	cp += sizeof(u_short);
91	((u_short )cp) = htons(class);
92	cp += sizeof(u_short);
93	((u_long )cp) = 0;
94	cp += sizeof(u_long);
95	((u_short )cp) = 0;
96	cp += sizeof(u_short);
97	hp->arcount = HTONS(1);
98	break;
99
100	case IQUERY:
101	/*
102	* Initialize answer section
103	*/
104	if (buflen < 1 + RRFIXEDSZ + datalen)
105	return (-1);
106	cp++ = '\0'; / no domain name */
107	((u_short )cp) = htons(type);
108	cp += sizeof(u_short);
109	((u_short )cp) = htons(class);
110	cp += sizeof(u_short);
111	((u_long )cp) = 0;
112	cp += sizeof(u_long);
113	((u_short )cp) = htons(datalen);
114	cp += sizeof(u_short);
115	if (datalen) {
116	bcopy(data, cp, datalen);
117	cp += datalen;
118	}
119	hp->ancount = HTONS(1);
120	break;
121
122	#ifdef notdef
123	case UPDATED:
124	/*
125	* Put record to be added or deleted in additional section
126	*/
127	buflen -= RRFIXEDSZ + datalen;
128	if ((n = dn_comp(dname, cp, buflen, NULL, NULL)) < 0)
129	return (-1);
130	cp += n;
131	((u_short )cp) = htons(type);
132	cp += sizeof(u_short);
133	((u_short )cp) = htons(class);
134	cp += sizeof(u_short);
135	((u_long )cp) = 0;
136	cp += sizeof(u_long);
137	((u_short )cp) = htons(datalen);
138	cp += sizeof(u_short);
139	if (datalen) {
140	bcopy(data, cp, datalen);
141	cp += datalen;
142	}
143	break;
144
145	case UPDATEM:
146	/*
147	* Record to be modified followed by its replacement
148	*/
149	buflen -= RRFIXEDSZ + datalen;
150	if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
151	return (-1);
152	cp += n;
153	((u_short )cp) = htons(type);
154	cp += sizeof(u_short);
155	((u_short )cp) = htons(class);
156	cp += sizeof(u_short);
157	((u_long )cp) = 0;
158	cp += sizeof(u_long);
159	((u_short )cp) = htons(datalen);
160	cp += sizeof(u_short);
161	if (datalen) {
162	bcopy(data, cp, datalen);
163	cp += datalen;
164	}
165
166	case UPDATEA:
167	buflen -= RRFIXEDSZ + newrr->r_size;
168	if ((n = dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
169	return (-1);
170	cp += n;
171	((u_short )cp) = htons(newrr->r_type);
172	cp += sizeof(u_short);
173	((u_short )cp) = htons(newrr->r_type);
174	cp += sizeof(u_short);
175	((u_long )cp) = htonl(newrr->r_ttl);
176	cp += sizeof(u_long);
177	((u_short )cp) = htons(newrr->r_size);
178	cp += sizeof(u_short);
179	if (newrr->r_size) {
180	bcopy(newrr->r_data, cp, newrr->r_size);
181	cp += newrr->r_size;
182	}
183	break;
184	#endif
185	}
186	return (cp - buf);
187	}