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-rw-r--r--methods/rfc2553emu.cc244
1 files changed, 244 insertions, 0 deletions
diff --git a/methods/rfc2553emu.cc b/methods/rfc2553emu.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ RFC 2553 Emulation - Provides emulation for RFC 2553 getaddrinfo,
+ freeaddrinfo and getnameinfo
+
+ This is really C code, it just has a .cc extensions to play nicer with
+ the rest of APT.
+
+ Originally written by Jason Gunthorpe <jgg@debian.org> and placed into
+ the Public Domain, do with it what you will.
+
+ ##################################################################### */
+ /*}}}*/
+#include <config.h>
+
+#include "rfc2553emu.h"
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#ifndef HAVE_GETADDRINFO
+// getaddrinfo - Resolve a hostname /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+int getaddrinfo(const char *nodename, const char *servname,
+ const struct addrinfo *hints,
+ struct addrinfo **res)
+{
+ struct addrinfo **Result = res;
+ hostent *Addr;
+ unsigned int Port;
+ int Proto;
+ const char *End;
+ char **CurAddr;
+
+ // Try to convert the service as a number
+ Port = htons(strtol(servname,(char **)&End,0));
+ Proto = SOCK_STREAM;
+
+ if (hints != 0 && hints->ai_socktype != 0)
+ Proto = hints->ai_socktype;
+
+ // Not a number, must be a name.
+ if (End != servname + strlen(servname))
+ {
+ struct servent *Srv = 0;
+
+ // Do a lookup in the service database
+ if (hints == 0 || hints->ai_socktype == SOCK_STREAM)
+ Srv = getservbyname(servname,"tcp");
+ if (hints != 0 && hints->ai_socktype == SOCK_DGRAM)
+ Srv = getservbyname(servname,"udp");
+ if (Srv == 0)
+ return EAI_NONAME;
+
+ // Get the right protocol
+ Port = Srv->s_port;
+ if (strcmp(Srv->s_proto,"tcp") == 0)
+ Proto = SOCK_STREAM;
+ else
+ {
+ if (strcmp(Srv->s_proto,"udp") == 0)
+ Proto = SOCK_DGRAM;
+ else
+ return EAI_NONAME;
+ }
+
+ if (hints != 0 && hints->ai_socktype != Proto &&
+ hints->ai_socktype != 0)
+ return EAI_SERVICE;
+ }
+
+ // Hostname lookup, only if this is not a listening socket
+ if (hints != 0 && (hints->ai_flags & AI_PASSIVE) != AI_PASSIVE)
+ {
+ Addr = gethostbyname(nodename);
+ if (Addr == 0)
+ {
+ if (h_errno == TRY_AGAIN)
+ return EAI_AGAIN;
+ if (h_errno == NO_RECOVERY)
+ return EAI_FAIL;
+ return EAI_NONAME;
+ }
+
+ // No A records
+ if (Addr->h_addr_list[0] == 0)
+ return EAI_NONAME;
+
+ CurAddr = Addr->h_addr_list;
+ }
+ else
+ CurAddr = (char **)&End; // Fake!
+
+ // Start constructing the linked list
+ *res = 0;
+ for (; *CurAddr != 0; CurAddr++)
+ {
+ // New result structure
+ *Result = (struct addrinfo *)calloc(sizeof(**Result),1);
+ if (*Result == 0)
+ {
+ freeaddrinfo(*res);
+ return EAI_MEMORY;
+ }
+ if (*res == 0)
+ *res = *Result;
+
+ (*Result)->ai_family = AF_INET;
+ (*Result)->ai_socktype = Proto;
+
+ // If we have the IPPROTO defines we can set the protocol field
+ #ifdef IPPROTO_TCP
+ if (Proto == SOCK_STREAM)
+ (*Result)->ai_protocol = IPPROTO_TCP;
+ if (Proto == SOCK_DGRAM)
+ (*Result)->ai_protocol = IPPROTO_UDP;
+ #endif
+
+ // Allocate space for the address
+ (*Result)->ai_addrlen = sizeof(struct sockaddr_in);
+ (*Result)->ai_addr = (struct sockaddr *)calloc(sizeof(sockaddr_in),1);
+ if ((*Result)->ai_addr == 0)
+ {
+ freeaddrinfo(*res);
+ return EAI_MEMORY;
+ }
+
+ // Set the address
+ ((struct sockaddr_in *)(*Result)->ai_addr)->sin_family = AF_INET;
+ ((struct sockaddr_in *)(*Result)->ai_addr)->sin_port = Port;
+
+ if (hints != 0 && (hints->ai_flags & AI_PASSIVE) != AI_PASSIVE)
+ ((struct sockaddr_in *)(*Result)->ai_addr)->sin_addr = *(in_addr *)(*CurAddr);
+ else
+ {
+ // Already zerod by calloc.
+ break;
+ }
+
+ Result = &(*Result)->ai_next;
+ }
+
+ return 0;
+}
+ /*}}}*/
+// freeaddrinfo - Free the result of getaddrinfo /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void freeaddrinfo(struct addrinfo *ai)
+{
+ while (ai != 0)
+ {
+ free(ai->ai_addr);
+ ai = ai->ai_next;
+ free(ai);
+ }
+}
+ /*}}}*/
+#endif // HAVE_GETADDRINFO
+
+#ifndef HAVE_GETNAMEINFO
+// getnameinfo - Convert a sockaddr to a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+int getnameinfo(const struct sockaddr *sa, socklen_t salen,
+ char *host, size_t hostlen,
+ char *serv, size_t servlen,
+ int flags)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)sa;
+
+ // This routine only supports internet addresses
+ if (sa->sa_family != AF_INET)
+ return EAI_ADDRFAMILY;
+
+ if (host != 0)
+ {
+ // Try to resolve the hostname
+ if ((flags & NI_NUMERICHOST) != NI_NUMERICHOST)
+ {
+ struct hostent *Ent = gethostbyaddr((char *)&sin->sin_addr,sizeof(sin->sin_addr),
+ AF_INET);
+ if (Ent != 0)
+ strncpy(host,Ent->h_name,hostlen);
+ else
+ {
+ if ((flags & NI_NAMEREQD) == NI_NAMEREQD)
+ {
+ if (h_errno == TRY_AGAIN)
+ return EAI_AGAIN;
+ if (h_errno == NO_RECOVERY)
+ return EAI_FAIL;
+ return EAI_NONAME;
+ }
+
+ flags |= NI_NUMERICHOST;
+ }
+ }
+
+ // Resolve as a plain numeric
+ if ((flags & NI_NUMERICHOST) == NI_NUMERICHOST)
+ {
+ strncpy(host,inet_ntoa(sin->sin_addr),hostlen);
+ }
+ }
+
+ if (serv != 0)
+ {
+ // Try to resolve the hostname
+ if ((flags & NI_NUMERICSERV) != NI_NUMERICSERV)
+ {
+ struct servent *Ent;
+ if ((flags & NI_DATAGRAM) == NI_DATAGRAM)
+ Ent = getservbyport(ntohs(sin->sin_port),"udp");
+ else
+ Ent = getservbyport(ntohs(sin->sin_port),"tcp");
+
+ if (Ent != 0)
+ strncpy(serv,Ent->s_name,servlen);
+ else
+ {
+ if ((flags & NI_NAMEREQD) == NI_NAMEREQD)
+ return EAI_NONAME;
+
+ flags |= NI_NUMERICSERV;
+ }
+ }
+
+ // Resolve as a plain numeric
+ if ((flags & NI_NUMERICSERV) == NI_NUMERICSERV)
+ {
+ snprintf(serv,servlen,"%u",ntohs(sin->sin_port));
+ }
+ }
+
+ return 0;
+}
+ /*}}}*/
+#endif // HAVE_GETNAMEINFO