7  * This is a simple DNS implementation for U-Boot. It will use the first IP
17  * Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
19  * "THE BEER-WARE LICENSE" (Revision 42):
41 	uchar *p, *pkt;  in dns_send()  local
48 	p = pkt;  in dns_send()
52 	header->tid      = 1;  in dns_send()
53 	header->flags    = htons(0x100);	/* standard query */  in dns_send()
54 	header->nqueries = htons(1);		/* Just one query */  in dns_send()
55 	header->nanswers = 0;  in dns_send()
56 	header->nauth    = 0;  in dns_send()
57 	header->nother   = 0;  in dns_send()
61 	p = (uchar *)&header->data;	/* For encoding host name into packet */  in dns_send()
68 		n = s - name;			/* Chunk length */  in dns_send()
69 		*p++ = n;			/* Copy length  */  in dns_send()
70 		memcpy(p, name, n);		/* Copy chunk   */  in dns_send()
71 		p += n;  in dns_send()
77 		name_len -= n;  in dns_send()
80 	*p++ = 0;			/* Mark end of host name */  in dns_send()
81 	*p++ = 0;			/* Some servers require double null */  in dns_send()
82 	*p++ = (unsigned char) qtype;	/* Query Type */  in dns_send()
84 	*p++ = 0;  in dns_send()
85 	*p++ = 1;				/* Class: inet, 0x0001 */  in dns_send()
87 	n = p - pkt;				/* Total packet length */  in dns_send()
107 	const unsigned char *p, *e, *s;  in dns_handler()  local
119 		debug("0x%p - 0x%.2x  0x%.2x  0x%.2x  0x%.2x\n",  in dns_handler()
124 	if (ntohs(header->nqueries) != 1)  in dns_handler()
128 	if (header->nanswers == 0) {  in dns_handler()
135 	s = &header->data[0];  in dns_handler()
137 	for (p = s; p < e && *p != '\0'; p++)  in dns_handler()
141 	if (&p[5] > e || get_unaligned_be16(p+1) != DNS_A_RECORD) {  in dns_handler()
148 	p += 5;  in dns_handler()
151 	for (found = stop = 0; !stop && &p[12] < e; ) {  in dns_handler()
153 		if (*p != 0xc0) {  in dns_handler()
154 			while (*p && &p[12] < e)  in dns_handler()
155 				p++;  in dns_handler()
156 			p--;  in dns_handler()
158 		debug("Name (Offset in header): %d\n", p[1]);  in dns_handler()
160 		type = get_unaligned_be16(p+2);  in dns_handler()
165 			dlen = get_unaligned_be16(p+10);  in dns_handler()
167 			p += 12 + dlen;  in dns_handler()
169 			debug("Found A-record\n");  in dns_handler()
178 	if (found && &p[12] < e) {  in dns_handler()
179 		dlen = get_unaligned_be16(p+10);  in dns_handler()
180 		p += 12;  in dns_handler()
181 		memcpy(&ip_addr, p, 4);  in dns_handler()
183 		if (p + dlen <= e) {  in dns_handler()