more transparant support for IPv6 name resolving

lib/ftp.c

@@ -1020,19 +1020,19 @@ CURLcode _ftp(struct connectdata *conn)
 
     if(data->set.ftpport) {
       if(Curl_if2ip(data->set.ftpport, myhost, sizeof(myhost))) {
-        h = Curl_gethost(data, myhost, &hostdataptr);
+        h = Curl_getaddrinfo(data, myhost, 0, &hostdataptr);
       }
       else {
         if(strlen(data->set.ftpport)>1)
-          h = Curl_gethost(data, data->set.ftpport, &hostdataptr);
+          h = Curl_getaddrinfo(data, data->set.ftpport, 0, &hostdataptr);
         if(h)
           strcpy(myhost, data->set.ftpport); /* buffer overflow risk */
       }
     }
     if(! *myhost) {
-      h=Curl_gethost(data,
-                     getmyhost(myhost, sizeof(myhost)),
-                     &hostdataptr);
+      h=Curl_getaddrinfo(data,
+                         getmyhost(myhost, sizeof(myhost)),
+                         0, &hostdataptr);
     }
     infof(data, "We connect from %s\n", myhost);
 
@@ -1151,11 +1151,11 @@ CURLcode _ftp(struct connectdata *conn)
       unsigned short newport; /* remote port, not necessary the local one */
       unsigned short connectport; /* the local port connect() should use! */
       char newhost[32];
-#ifdef ENABLE_IPV6
-      struct addrinfo *res;
-#else
-      struct hostent *he;
+
+      Curl_addrinfo *he;
       char *hostdataptr=NULL;
+
+#ifndef ENABLE_IPV6
       char *ip_addr;
 #endif
       char *str=buf;
@@ -1192,24 +1192,14 @@ CURLcode _ftp(struct connectdata *conn)
          * proxy again here. We already have the name info for it since the
          * previous lookup.
          */
-#ifdef ENABLE_IPV6
-        res = conn->hp;
-#else
         he = conn->hp;
-#endif
         connectport =
           (unsigned short)conn->port; /* we connect to the proxy's port */
       }
       else {
         /* normal, direct, ftp connection */
-#ifdef ENABLE_IPV6
-        res = Curl_getaddrinfo(data, newhost, newport);
-        if(!res)
-#else
-        he = Curl_gethost(data, newhost, &hostdataptr);
-        if(!he)
-#endif
-        {
+        he = Curl_getaddrinfo(data, newhost, newport, &hostdataptr);
+        if(!he) {
           failf(data, "Can't resolve new host %s", newhost);
           return CURLE_FTP_CANT_GET_HOST;
         }

lib/hostip.c

@@ -55,6 +55,7 @@
 
 #include "urldata.h"
 #include "sendf.h"
+#include "hostip.h"
 
 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
 #include "inet_ntoa_r.h"
@@ -89,14 +90,17 @@ static char *MakeIP(unsigned long num,char *addr, int addr_len)
 }
 
 #ifdef ENABLE_IPV6
-struct addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
-			       char *hostname,
-			       int port)
+Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
+                                char *hostname,
+                                int port,
+                                char **bufp)
 {
   struct addrinfo hints, *res;
   int error;
   char sbuf[NI_MAXSERV];
 
+  *bufp=NULL; /* pointer unused with IPv6 */
+
   memset(&hints, 0, sizeof(hints));
   hints.ai_family = PF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
@@ -109,7 +113,7 @@ struct addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
   }
   return res;
 }
-#endif
+#else /* following code is IPv4-only */
 
 /* The original code to this function was once stolen from the Dancer source
    code, written by Bjorn Reese, it has since been patched and modified
@@ -119,9 +123,10 @@ struct addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
 #define INADDR_NONE (unsigned long) ~0
 #endif
 
-struct hostent *Curl_gethost(struct SessionHandle *data,
-                             char *hostname,
-                             char **bufp)
+Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
+                                char *hostname,
+                                int port,
+                                char **bufp)
 {
   struct hostent *h = NULL;
   unsigned long in;
@@ -137,6 +142,7 @@ struct hostent *Curl_gethost(struct SessionHandle *data,
     return NULL; /* major failure */
   *bufp = buf;
 
+  port=0; /* unused in IPv4 code */
   ret = 0; /* to prevent the compiler warning */
 
   if ( (in=inet_addr(hostname)) != INADDR_NONE ) {
@@ -216,6 +222,8 @@ struct hostent *Curl_gethost(struct SessionHandle *data,
   return (h);
 }
 
+#endif /* end of IPv4-specific code */
+
 /*
  * local variables:
  * eval: (load-file "../curl-mode.el")

lib/hostip.h

@@ -24,12 +24,18 @@
  *****************************************************************************/
 
 struct addrinfo;
-struct addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
-                             char *hostname,
-                             int port);
+struct hostent;
+struct SessionHandle;
 
-struct hostent *Curl_gethost(struct SessionHandle *data,
-                             char *hostname,
-                             char **bufp);
+#ifdef ENABLE_IPV6
+typedef struct addrinfo Curl_addrinfo;
+#else
+typedef struct hostent Curl_addrinfo;
+#endif
+
+Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
+                                char *hostname,
+                                int port,
+                                char **bufp);
 
 #endif

lib/url.c

@@ -1158,11 +1158,11 @@ static CURLcode ConnectPlease(struct SessionHandle *data,
     unsigned long in;
 
     if(Curl_if2ip(data->set.device, myhost, sizeof(myhost))) {
-      h = Curl_gethost(data, myhost, &hostdataptr);
+      h = Curl_getaddrinfo(data, myhost, 0, &hostdataptr);
     }
     else {
       if(strlen(data->set.device)>1) {
-        h = Curl_gethost(data, data->set.device, &hostdataptr);
+        h = Curl_getaddrinfo(data, data->set.device, 0, &hostdataptr);
       }
       if(h) {
         /* we know data->set.device is shorter than the myhost array */
@@ -2163,16 +2163,11 @@ static CURLcode Connect(struct SessionHandle *data,
 
     /* Resolve target host right on */
     if(!conn->hp) {
-#ifdef ENABLE_IPV6
       /* it might already be set if reusing a connection */
-      conn->hp = Curl_getaddrinfo(data, conn->name, conn->port);
-#else
-      /* it might already be set if reusing a connection */
-      conn->hp = Curl_gethost(data, conn->name, &conn->hostent_buf);
-#endif
+      conn->hp = Curl_getaddrinfo(data, conn->name, conn->port,
+                                  &conn->hostent_buf);
     }
-    if(!conn->hp)
-    {
+    if(!conn->hp) {
       failf(data, "Couldn't resolve host '%s'", conn->name);
       return CURLE_COULDNT_RESOLVE_HOST;
     }
@@ -2182,12 +2177,10 @@ static CURLcode Connect(struct SessionHandle *data,
        if we're reusing an existing connection. */
 
     /* resolve proxy */
-#ifdef ENABLE_IPV6
-      /* it might already be set if reusing a connection */
-    conn->hp = Curl_getaddrinfo(data, conn->proxyhost, conn->port);
-#else
-    conn->hp = Curl_gethost(data, conn->proxyhost, &conn->hostent_buf);
-#endif
+    /* it might already be set if reusing a connection */
+    conn->hp = Curl_getaddrinfo(data, conn->proxyhost, conn->port,
+                                &conn->hostent_buf);
+
     if(!conn->hp) {
       failf(data, "Couldn't resolve proxy '%s'", conn->proxyhost);
       return CURLE_COULDNT_RESOLVE_PROXY;

lib/urldata.h

@@ -26,6 +26,7 @@
 /* This file is for lib internal stuff */
 
 #include "setup.h"
+#include "hostip.h"
 
 #define PORT_FTP 21
 #define PORT_TELNET 23
@@ -223,12 +224,12 @@ struct connectdata {
 #define PROT_FILE    (1<<8)
 #define PROT_FTPS    (1<<9)
 
+  Curl_addrinfo *hp; /* IP-protocol independent host info pointer list */
+  char *hostent_buf; /* pointer to allocated memory for name info */
+
 #ifdef ENABLE_IPV6
-  struct addrinfo *hp; /* host info pointer list */
   struct addrinfo *ai; /* the particular host we use */
 #else
-  char *hostent_buf; /* pointer to allocated memory for name info */
-  struct hostent *hp;
   struct sockaddr_in serv_addr;
 #endif
   char protostr[64];  /* store the protocol string in this buffer */