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157 lines
4.8 KiB
Diff
157 lines
4.8 KiB
Diff
--- /dev/null
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+++ b/dnsnamex.c
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@@ -0,0 +1,34 @@
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+#include "buffer.h"
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+#include "exit.h"
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+#include "strerr.h"
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+#include "ip4.h"
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+#include "dns.h"
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+
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+#define FATAL "dnsnamex: fatal: "
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+
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+static char seed[128];
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+
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+char ip[4];
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+static stralloc out;
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+
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+int main(int argc,char **argv)
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+{
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+ dns_random_init(seed);
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+
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+ if (*argv) ++argv;
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+
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+ while (*argv) {
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+ if (!ip4_scan(*argv,ip))
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+ strerr_die3x(111,FATAL,"unable to parse IP address ",*argv);
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+ if (dns_name4_multi(&out,ip) == -1)
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+ strerr_die4sys(111,FATAL,"unable to find host name for ",*argv,": ");
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+
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+ buffer_put(buffer_1,out.s,out.len);
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+ buffer_puts(buffer_1,"\n");
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+
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+ ++argv;
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+ }
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+
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+ buffer_flush(buffer_1);
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+ _exit(0);
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+}
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--- /dev/null
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+++ b/dns_namex.c
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@@ -0,0 +1,48 @@
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+#include "stralloc.h"
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+#include "uint16.h"
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+#include "byte.h"
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+#include "dns.h"
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+
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+static char *q = 0;
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+
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+int dns_name_packet_multi(stralloc *out,const char *buf,unsigned int len)
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+{
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+ unsigned int pos;
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+ char header[12];
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+ uint16 numanswers;
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+ uint16 datalen;
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+
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+ if (!stralloc_copys(out,"")) return -1;
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+
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+ pos = dns_packet_copy(buf,len,0,header,12); if (!pos) return -1;
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+ uint16_unpack_big(header + 6,&numanswers);
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+ pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1;
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+ pos += 4;
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+
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+ while (numanswers--) {
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+ pos = dns_packet_skipname(buf,len,pos); if (!pos) return -1;
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+ pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) return -1;
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+ uint16_unpack_big(header + 8,&datalen);
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+ if (byte_equal(header,2,DNS_T_PTR))
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+ if (byte_equal(header + 2,2,DNS_C_IN)) {
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+ if (!dns_packet_getname(buf,len,pos,&q)) return -1;
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+ if (!dns_domain_todot_cat(out,q)) return -1;
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+ if (!stralloc_cats(out, " ")) return -1 ;
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+ }
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+ pos += datalen;
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+ }
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+
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+ return 0;
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+}
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+
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+int dns_name4_multi(stralloc *out,const char ip[4])
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+{
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+ char name[DNS_NAME4_DOMAIN];
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+
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+ dns_name4_domain(name,ip);
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+ if (dns_resolve(name,DNS_T_PTR) == -1) return -1;
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+ if (dns_name_packet_multi(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) == -1) return -1;
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+ dns_transmit_free(&dns_resolve_tx);
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+ dns_domain_free(&q);
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+ return 0;
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+}
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--- a/dns.h
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+++ b/dns.h
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@@ -70,9 +70,11 @@ extern struct dns_transmit dns_resolve_t
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extern int dns_ip4_packet(stralloc *,const char *,unsigned int);
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extern int dns_ip4(stralloc *,const stralloc *);
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extern int dns_name_packet(stralloc *,const char *,unsigned int);
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+extern int dns_name_packet_multi(stralloc *,const char *,unsigned int);
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extern void dns_name4_domain(char *,const char *);
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#define DNS_NAME4_DOMAIN 31
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extern int dns_name4(stralloc *,const char *);
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+extern int dns_name4_multi(stralloc *,const char *);
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extern int dns_txt_packet(stralloc *,const char *,unsigned int);
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extern int dns_txt(stralloc *,const stralloc *);
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extern int dns_mx_packet(stralloc *,const char *,unsigned int);
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--- a/Makefile
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+++ b/Makefile
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@@ -219,10 +219,10 @@ uint64.h taia.h dd.h
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dns.a: \
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makelib dns_dfd.o dns_domain.o dns_dtda.o dns_ip.o dns_ipq.o dns_mx.o \
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-dns_name.o dns_nd.o dns_packet.o dns_random.o dns_rcip.o dns_rcrw.o \
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+dns_name.o dns_namex.o dns_nd.o dns_packet.o dns_random.o dns_rcip.o dns_rcrw.o \
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dns_resolve.o dns_sortip.o dns_transmit.o dns_txt.o
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./makelib dns.a dns_dfd.o dns_domain.o dns_dtda.o dns_ip.o \
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- dns_ipq.o dns_mx.o dns_name.o dns_nd.o dns_packet.o \
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+ dns_ipq.o dns_mx.o dns_name.o dns_namex.o dns_nd.o dns_packet.o \
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dns_random.o dns_rcip.o dns_rcrw.o dns_resolve.o \
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dns_sortip.o dns_transmit.o dns_txt.o
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@@ -261,6 +261,11 @@ compile dns_name.c stralloc.h gen_alloc.
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stralloc.h iopause.h taia.h tai.h uint64.h taia.h
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./compile dns_name.c
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+dns_namex.o: \
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+compile dns_namex.c stralloc.h gen_alloc.h uint16.h byte.h dns.h \
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+stralloc.h iopause.h taia.h tai.h uint64.h taia.h
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+ ./compile dns_namex.c
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+
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dns_nd.o: \
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compile dns_nd.c byte.h fmt.h dns.h stralloc.h gen_alloc.h iopause.h \
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taia.h tai.h uint64.h taia.h
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@@ -394,6 +399,17 @@ compile dnsname.c buffer.h exit.h strerr
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gen_alloc.h iopause.h taia.h tai.h uint64.h taia.h
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./compile dnsname.c
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+dnsnamex: \
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+load dnsnamex.o iopause.o dns.a env.a libtai.a alloc.a buffer.a unix.a \
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+byte.a socket.lib
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+ ./load dnsnamex iopause.o dns.a env.a libtai.a alloc.a \
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+ buffer.a unix.a byte.a `cat socket.lib`
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+
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+dnsnamex.o: \
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+compile dnsnamex.c buffer.h exit.h strerr.h ip4.h dns.h stralloc.h \
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+gen_alloc.h iopause.h taia.h tai.h uint64.h taia.h
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+ ./compile dnsnamex.c
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+
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dnsq: \
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load dnsq.o iopause.o printrecord.o printpacket.o parsetype.o dns.a \
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env.a libtai.a buffer.a alloc.a unix.a byte.a socket.lib
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@@ -658,7 +674,7 @@ prog: \
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dnscache-conf dnscache walldns-conf walldns rbldns-conf rbldns \
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rbldns-data pickdns-conf pickdns pickdns-data tinydns-conf tinydns \
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tinydns-data tinydns-get tinydns-edit axfr-get axfrdns-conf axfrdns \
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-dnsip dnsipq dnsname dnstxt dnsmx dnsfilter random-ip dnsqr dnsq \
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+dnsip dnsipq dnsname dnsnamex dnstxt dnsmx dnsfilter random-ip dnsqr dnsq \
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dnstrace dnstracesort cachetest utime rts
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prot.o: \
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