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authorJannis Hoffmann <jannis@fehcom.de>2024-07-09 13:58:20 +0200
committerJannis Hoffmann <jannis@fehcom.de>2024-07-09 13:58:20 +0200
commit249866e3d1e11dc72eaa1305f4bb479ded92ef38 (patch)
tree7118c5f58e29fe61c100e4d067bb90ba8d52589e /dnsstub/dns_ip.c
parent96cf8dffe4f7b0b910f790066ae622dc429eb522 (diff)
reorganized file structure
Moved c files into src/. Corrected VERSION file. Removed BUILD and FILES.
Diffstat (limited to 'dnsstub/dns_ip.c')
-rw-r--r--dnsstub/dns_ip.c198
1 files changed, 0 insertions, 198 deletions
diff --git a/dnsstub/dns_ip.c b/dnsstub/dns_ip.c
deleted file mode 100644
index f89728c..0000000
--- a/dnsstub/dns_ip.c
+++ /dev/null
@@ -1,198 +0,0 @@
-#include "stralloc.h"
-#include "uint_t.h"
-#include "byte.h"
-#include "ip.h"
-#include "dnsresolv.h"
-
-/**
- @file dns_ip.c
- @author djb, fefe, feh
- @source ucspi-tcp6
- @brief DNS IP query
-*/
-
-static char *q = 0;
-
-int dns_ip4_packet(stralloc *out,const char *buf,unsigned int len)
-{
- unsigned int pos;
- char header[12];
- uint16 numanswers;
- uint16 datalen;
- int ranswers = 0;
-
- if (!stralloc_copys(out,"")) return DNS_MEM;
-
- pos = dns_packet_copy(buf,len,0,header,12); if (!pos) return DNS_ERR;
- uint16_unpack_big(header + 6,&numanswers);
- pos = dns_packet_skipname(buf,len,pos); if (!pos) return DNS_ERR;
- pos += 4;
-
- while (numanswers--) {
- pos = dns_packet_skipname(buf,len,pos); if (!pos) return DNS_ERR;
- pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) return DNS_ERR;
- uint16_unpack_big(header + 8,&datalen);
- if (byte_equal(header,2,DNS_T_A))
- if (byte_equal(header + 2,2,DNS_C_IN))
- if (datalen == 4) {
- if (!dns_packet_copy(buf,len,pos,header,4)) return DNS_ERR;
- if (!stralloc_catb(out,header,4)) return DNS_MEM;
- }
- pos += datalen;
- ++ranswers;
- }
-
- dns_sortip4(out->s,out->len);
- return ranswers;
-}
-
-int dns_ip4(stralloc *out,stralloc *fqdn)
-{
- unsigned int i;
- char code = 0;
- int dot = 0;
- char ch;
- char ip[4];
- int r;
- int rc = 0;
-
- if (!stralloc_copys(out,"")) return DNS_MEM;
- if (!stralloc_readyplus(fqdn,1)) return DNS_MEM;
-
- fqdn->s[fqdn->len] = 0; /* test FQDN string */
- for (i = 1; i < fqdn->len; i++) {
- if (fqdn->s[i] >= '_') { code = 127; break; }
- if (fqdn->s[i] == '.') dot++;
- }
-
- if (code != 127 && dot == 3) /* if FQDN is just IPv4 */
- if (ip4_scan(fqdn->s,ip) || ip4_scanbracket(fqdn->s,ip)) {
- if (!stralloc_copyb(out,ip,4)) return DNS_MEM;
- return 1;
- }
-
- code = 0;
- for (i = 0; i <= fqdn->len; ++i) {
- if (i < fqdn->len)
- ch = fqdn->s[i];
- else
- ch = '.';
-
- if ((ch == '[') || (ch == ']')) continue;
- if (ch == '.') {
- if (!stralloc_append(out,&code)) return DNS_MEM;
- code = 0;
- continue;
- }
- if ((ch >= '0') && (ch <= '9')) {
- code *= 10;
- code += ch - '0';
- continue;
- }
-
- if (dns_domain_fromdot(&q,fqdn->s,fqdn->len) <= 0) return DNS_ERR; // fdqn -> A query -> response
- if (dns_resolve(q,DNS_T_A) >= 0) {
- if ((r = dns_ip4_packet(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen)) < 0) return DNS_ERR;
- dns_transmit_free(&dns_resolve_tx);
- dns_domain_free(&q);
- rc += r;
- }
-
- return rc;
- }
-
- out->len &= ~3;
- return 0;
-}
-
-int dns_ip6_packet(stralloc *out,const char *buf,unsigned int len)
-{
- unsigned int pos;
- char header[16];
- uint16 numanswers;
- uint16 datalen;
- int ranswers = 0;
-
- if (!stralloc_copys(out,"")) return DNS_MEM;
-
- pos = dns_packet_copy(buf,len,0,header,12); if (!pos) return DNS_ERR;
- uint16_unpack_big(header + 6,&numanswers);
- pos = dns_packet_skipname(buf,len,pos); if (!pos) return DNS_ERR;
- pos += 4;
-
- while (numanswers--) {
- pos = dns_packet_skipname(buf,len,pos); if (!pos) return DNS_ERR;
- pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) return DNS_ERR;
- uint16_unpack_big(header + 8,&datalen);
- if (byte_equal(header,2,DNS_T_AAAA)) {
- if (byte_equal(header + 2,2,DNS_C_IN))
- if (datalen == 16) {
- if (!dns_packet_copy(buf,len,pos,header,16)) return DNS_ERR;
- if (!stralloc_catb(out,header,16)) return DNS_MEM;
- }
- } else if (byte_equal(header,2,DNS_T_A))
- if (byte_equal(header + 2,2,DNS_C_IN))
- if (datalen == 4) {
- byte_copy(header,12,V4mappedprefix);
- if (!dns_packet_copy(buf,len,pos,header + 12,4)) return DNS_ERR;
- if (!stralloc_catb(out,header,16)) return DNS_MEM;
- }
- pos += datalen;
- ++ranswers;
- }
-
- dns_sortip6(out->s,out->len);
- return ranswers;
-}
-
-int dns_ip6(stralloc *out,stralloc *fqdn)
-{
- unsigned int i;
- char code;
- char ch;
- char ip[16];
- int r;
- int rc = 0;
-
- if (!stralloc_copys(out,"")) return DNS_MEM;
- if (!stralloc_readyplus(fqdn,1)) return DNS_MEM;
-
- fqdn->s[fqdn->len] = 0; /* if FQDN is just IPv6 */
- if (ip6_scan(fqdn->s,ip) || ip6_scanbracket(fqdn->s,ip)) {
- if (!stralloc_copyb(out,ip,16)) return DNS_MEM;
- return 1;
- }
-
- code = 0;
- for (i = 0; i <= fqdn->len; ++i) {
- if (i < fqdn->len)
- ch = fqdn->s[i];
- else
- ch = '.';
-
- if ((ch == '[') || (ch == ']')) continue;
- if (ch == '.') {
- if (!stralloc_append(out,&code)) return DNS_MEM;
- code = 0;
- continue;
- }
- if ((ch >= '0') && (ch <= '9')) {
- code *= 10;
- code += ch - '0';
- continue;
- }
-
- if (dns_domain_fromdot(&q,fqdn->s,fqdn->len) <= 0) return DNS_ERR; // fqdn -> AAAA query -> response
- if (dns_resolve(q,DNS_T_AAAA) >= 0) {
- if ((r = dns_ip6_packet(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen)) < 0) return DNS_ERR;
- dns_transmit_free(&dns_resolve_tx);
- dns_domain_free(&q);
- rc += r;
- }
-
- return rc;
- }
-
- out->len &= ~3;
- return 0;
-}