From 0e5b2871ca6456b01d4bf037a6e68badf1ff1a41 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Henryk=20Pl=C3=B6tz?= Date: Fri, 3 Oct 2014 19:58:52 +0200 Subject: Initial commit of djbdns-1.05.tar.gz Source was http://cr.yp.to/djbdns/djbdns-1.05.tar.gz, SHA1 2efdb3a039d0c548f40936aa9cb30829e0ce8c3d --- dns_name.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 dns_name.c (limited to 'dns_name.c') diff --git a/dns_name.c b/dns_name.c new file mode 100644 index 0000000..6f7cdc3 --- /dev/null +++ b/dns_name.c @@ -0,0 +1,48 @@ +#include "stralloc.h" +#include "uint16.h" +#include "byte.h" +#include "dns.h" + +static char *q = 0; + +int dns_name_packet(stralloc *out,const char *buf,unsigned int len) +{ + unsigned int pos; + char header[12]; + uint16 numanswers; + uint16 datalen; + + if (!stralloc_copys(out,"")) return -1; + + pos = dns_packet_copy(buf,len,0,header,12); if (!pos) return -1; + uint16_unpack_big(header + 6,&numanswers); + pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1; + pos += 4; + + while (numanswers--) { + pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1; + pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) return -1; + uint16_unpack_big(header + 8,&datalen); + if (byte_equal(header,2,DNS_T_PTR)) + if (byte_equal(header + 2,2,DNS_C_IN)) { + if (!dns_packet_getname(buf,len,pos,&q)) return -1; + if (!dns_domain_todot_cat(out,q)) return -1; + return 0; + } + pos += datalen; + } + + return 0; +} + +int dns_name4(stralloc *out,const char ip[4]) +{ + char name[DNS_NAME4_DOMAIN]; + + dns_name4_domain(name,ip); + if (dns_resolve(name,DNS_T_PTR) == -1) return -1; + if (dns_name_packet(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) == -1) return -1; + dns_transmit_free(&dns_resolve_tx); + dns_domain_free(&q); + return 0; +} -- cgit v1.2.3