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authorMichael Vogt <mvo@ubuntu.com>2014-05-20 13:15:51 +0200
committerMichael Vogt <mvo@ubuntu.com>2014-05-20 13:35:43 +0200
commitf106fecc1d7d0250d1d76c2ba837dc0c870c5fff (patch)
tree1b15821de4a8ad2c43ec92d27e2dc603703238a8 /apt-pkg
parent98c934f2723d63d00908803ad47ab1359081ec2d (diff)
add GetSrvRecord helper to apt-pkg/contrib/srvrec.{cc,h}
Diffstat (limited to 'apt-pkg')
-rw-r--r--apt-pkg/contrib/srvrec.cc93
-rw-r--r--apt-pkg/contrib/srvrec.h30
2 files changed, 123 insertions, 0 deletions
diff --git a/apt-pkg/contrib/srvrec.cc b/apt-pkg/contrib/srvrec.cc
new file mode 100644
index 000000000..d5d89fc67
--- /dev/null
+++ b/apt-pkg/contrib/srvrec.cc
@@ -0,0 +1,93 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ SRV record support
+
+ ##################################################################### */
+ /*}}}*/
+#include <config.h>
+
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>
+
+#include <apt-pkg/error.h>
+#include "srvrec.h"
+
+bool GetSrvRecords(std::string name, std::vector<SrvRec> &Result)
+{
+ unsigned char answer[PACKETSZ];
+ int answer_len, compressed_name_len;
+ int answer_count;
+
+ if (res_init() != 0)
+ return _error->Errno("res_init", "Failed to init resolver");
+
+ answer_len = res_query(name.c_str(), C_IN, T_SRV, answer, sizeof(answer));
+ if (answer_len < (int)sizeof(HEADER))
+ return _error->Warning("Not enough data from res_query (%i)", answer_len);
+
+ // check the header
+ HEADER *header = (HEADER*)answer;
+ if (header->rcode != NOERROR)
+ return _error->Warning("res_query returned rcode %i", header->rcode);
+ answer_count = ntohs(header->ancount);
+ if (answer_count <= 0)
+ return _error->Warning("res_query returned no answers (%i) ", answer_count);
+
+ // skip the header
+ compressed_name_len = dn_skipname(answer+sizeof(HEADER), answer+answer_len);
+ if(compressed_name_len < 0)
+ return _error->Warning("dn_skipname failed %i", compressed_name_len);
+
+ // pt points to the first answer record, go over all of them now
+ unsigned char *pt = answer+sizeof(HEADER)+compressed_name_len+QFIXEDSZ;
+ while ((int)Result.size() < answer_count && pt < answer+answer_len)
+ {
+ SrvRec rec;
+ u_int16_t type, klass, priority, weight, port, dlen;
+ char buf[MAXDNAME];
+
+ compressed_name_len = dn_skipname(pt, answer+answer_len);
+ if (compressed_name_len < 0)
+ return _error->Warning("dn_skipname failed (2): %i",
+ compressed_name_len);
+ pt += compressed_name_len;
+ if (((answer+answer_len) - pt) < 16)
+ return _error->Warning("packet too short");
+
+ // extract the data out of the result buffer
+ #define extract_u16(target, p) target = *p++ << 8; target |= *p++;
+
+ extract_u16(type, pt);
+ if(type != T_SRV)
+ return _error->Warning("Unexpected type excepted %x != %x",
+ T_SRV, type);
+ extract_u16(klass, pt);
+ if(klass != C_IN)
+ return _error->Warning("Unexpected class excepted %x != %x",
+ C_IN, klass);
+ pt += 4; // ttl
+ extract_u16(dlen, pt);
+ extract_u16(priority, pt);
+ extract_u16(weight, pt);
+ extract_u16(port, pt);
+
+ #undef extract_u16
+
+ compressed_name_len = dn_expand(answer, answer+answer_len, pt, buf, sizeof(buf));
+ if(compressed_name_len < 0)
+ return _error->Warning("dn_expand failed %i", compressed_name_len);
+ pt += compressed_name_len;
+
+ // add it to our class
+ rec.priority = priority;
+ rec.weight = weight;
+ rec.port = port;
+ rec.target = buf;
+ Result.push_back(rec);
+ }
+
+ return true;
+}
diff --git a/apt-pkg/contrib/srvrec.h b/apt-pkg/contrib/srvrec.h
new file mode 100644
index 000000000..583907706
--- /dev/null
+++ b/apt-pkg/contrib/srvrec.h
@@ -0,0 +1,30 @@
+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ SRV record support
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef SRVREC_H
+#define SRVREC_H
+
+#include <arpa/nameser.h>
+#include <vector>
+#include <string>
+
+class SrvRec
+{
+ public:
+ std::string target;
+ u_int16_t priority;
+ u_int16_t weight;
+ u_int16_t port;
+
+ // see rfc-2782
+ //int random;
+};
+
+bool GetSrvRecords(std::string name, std::vector<SrvRec> &Result);
+
+#endif