Modernize the build system.

[tinc] / src / fake-getaddrinfo.c

diff --git a/src/fake-getaddrinfo.c b/src/fake-getaddrinfo.c
new file mode 100644 (file)
index 0000000..10672b7
--- /dev/null
+++ b/src/fake-getaddrinfo.c
@@ -0,0 +1,105 @@
+/*
+ * 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 "system.h"
+
+#include "ipv4.h"
+#include "ipv6.h"
+#include "fake-getaddrinfo.h"
+#include "xalloc.h"
+
+#if !HAVE_DECL_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";
+               case EAI_FAMILY:
+                       return "Address family not supported";
+               default:
+                       return "Unknown error";
+       }
+}    
+#endif /* !HAVE_GAI_STRERROR */
+
+#if !HAVE_DECL_FREEADDRINFO
+void freeaddrinfo(struct addrinfo *ai)
+{
+       struct addrinfo *next;
+
+       while(ai) {
+               next = ai->ai_next;
+               free(ai);
+               ai = next;
+       }
+}
+#endif /* !HAVE_FREEADDRINFO */
+
+#if !HAVE_DECL_GETADDRINFO
+static struct addrinfo *malloc_ai(uint16_t port, uint32_t addr)
+{
+       struct addrinfo *ai;
+
+       ai = xmalloc_and_zero(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
+       
+       ai->ai_addr = (struct sockaddr *)(ai + 1);
+       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 *prev = NULL;
+       struct hostent *hp;
+       struct in_addr in = {0};
+       int i;
+       uint16_t port = 0;
+
+       if(hints && hints->ai_family != AF_INET && hints->ai_family != AF_UNSPEC)
+               return EAI_FAMILY;
+
+       if (servname)
+               port = htons(atoi(servname));
+
+       if (hints && hints->ai_flags & AI_PASSIVE) {
+               *res = malloc_ai(port, htonl(0x00000000));
+               return 0;
+       }
+               
+       if (!hostname) {
+               *res = malloc_ai(port, htonl(0x7f000001));
+               return 0;
+       }
+       
+       hp = gethostbyname(hostname);
+
+       if(!hp || !hp->h_addr_list || !hp->h_addr_list[0])
+               return EAI_NODATA;
+
+       for (i = 0; hp->h_addr_list[i]; i++) {
+               *res = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
+
+               if(prev)
+                       prev->ai_next = *res;
+
+               prev = *res;
+       }
+
+       return 0;
+}
+#endif /* !HAVE_GETADDRINFO */