Include complete fake-getname/addrinfo from OpenSSH.

[tinc] / lib / fake-getaddrinfo.c

diff --git a/lib/fake-getaddrinfo.c b/lib/fake-getaddrinfo.c
new file mode 100644 (file)
index 0000000..a1d36b1
--- /dev/null
+++ b/lib/fake-getaddrinfo.c
@@ -0,0 +1,128 @@
+/*
+ * fake library for ssh
+ *
+ * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
+ * These funtions are defined in rfc2133.
+ *
+ * But these functions are not implemented correctly. The minimum subset
+ * is implemented for ssh use only. For exapmle, this routine assumes
+ * that ai_family is AF_INET. Don't use it for another purpose.
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+
+#include <system.h>
+
+#include "fake-getaddrinfo.h"
+
+#ifndef HAVE_GAI_STRERROR
+char *gai_strerror(int ecode)
+{
+       switch (ecode) {
+               case EAI_NODATA:
+                       return "no address associated with hostname.";
+               case EAI_MEMORY:
+                       return "memory allocation failure.";
+               default:
+                       return "unknown error.";
+       }
+}    
+#endif /* !HAVE_GAI_STRERROR */
+
+#ifndef HAVE_FREEADDRINFO
+void freeaddrinfo(struct addrinfo *ai)
+{
+       struct addrinfo *next;
+
+       do {
+               next = ai->ai_next;
+               free(ai);
+       } while (NULL != (ai = next));
+}
+#endif /* !HAVE_FREEADDRINFO */
+
+#ifndef HAVE_GETADDRINFO
+static struct addrinfo *malloc_ai(int port, u_long addr)
+{
+       struct addrinfo *ai;
+
+       ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
+       if (ai == NULL)
+               return(NULL);
+       
+       memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
+       
+       ai->ai_addr = (struct sockaddr *)(ai + 1);
+       /* XXX -- ssh doesn't use sa_len */
+       ai->ai_addrlen = sizeof(struct sockaddr_in);
+       ai->ai_addr->sa_family = ai->ai_family = AF_INET;
+
+       ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
+       ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
+       
+       return(ai);
+}
+
+int getaddrinfo(const char *hostname, const char *servname, 
+                const struct addrinfo *hints, struct addrinfo **res)
+{
+       struct addrinfo *cur, *prev = NULL;
+       struct hostent *hp;
+       struct in_addr in;
+       int i, port;
+
+       if (servname)
+               port = htons(atoi(servname));
+       else
+               port = 0;
+
+       if (hints && hints->ai_flags & AI_PASSIVE) {
+               if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
+                       return 0;
+               else
+                       return EAI_MEMORY;
+       }
+               
+       if (!hostname) {
+               if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
+                       return 0;
+               else
+                       return EAI_MEMORY;
+       }
+       
+       if (inet_aton(hostname, &in)) {
+               if (NULL != (*res = malloc_ai(port, in.s_addr)))
+                       return 0;
+               else
+                       return EAI_MEMORY;
+       }
+       
+       hp = gethostbyname(hostname);
+       if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
+               for (i = 0; hp->h_addr_list[i]; i++) {
+                       cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
+                       if (cur == NULL) {
+                               if (*res)
+                                       freeaddrinfo(*res);
+                               return EAI_MEMORY;
+                       }
+                       
+                       if (prev)
+                               prev->ai_next = cur;
+                       else
+                               *res = cur;
+
+                       prev = cur;
+               }
+               return 0;
+       }
+       
+       return EAI_NODATA;
+}
+#endif /* !HAVE_GETADDRINFO */