Simplify the socket handling code by supplying a replacement getaddrinfo()

function if the OS doesn't provide one.

src/port/getaddrinfo.c

@@ -0,0 +1,132 @@
+/* $Header: /cvsroot/pgsql/src/port/getaddrinfo.c,v 1.1 2003/03/29 11:31:52 petere Exp $ */
+
+#include "c.h"
+#include "getaddrinfo.h"
+#include <netdb.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+
+int
+getaddrinfo(const char *node, const char *service,
+			const struct addrinfo *hints,
+			struct addrinfo **res)
+{
+	struct addrinfo *ai;
+	struct sockaddr_in sin, *psin;
+
+	if (!hints || (hints->ai_family != AF_INET && hints->ai_family != AF_UNSPEC))
+		return EAI_FAMILY;
+
+	if (hints->ai_socktype != SOCK_STREAM)
+		return EAI_SOCKTYPE;
+
+	if (!node && !service)
+		return EAI_NONAME;
+
+	if (node)
+	{
+		if (node[0] == '\0')
+			sin.sin_addr.s_addr = htonl(INADDR_ANY);
+		else if (hints->ai_flags & AI_NUMERICHOST)
+		{
+			inet_aton(node, &sin.sin_addr);
+		}
+		else
+		{
+			struct hostent *hp;
+
+			hp = gethostbyname(node);
+			if (hp == NULL)
+			{
+				switch (h_errno)
+				{
+					case HOST_NOT_FOUND:
+						return EAI_NONAME;
+					case NO_DATA:
+						return EAI_NODATA;
+					case TRY_AGAIN:
+						return EAI_AGAIN;
+					case NO_RECOVERY:
+					default:
+						return EAI_FAIL;
+				}
+			}
+			if (hp->h_addrtype != AF_INET)
+				return EAI_ADDRFAMILY;
+
+			memmove(&(sin.sin_addr), hp->h_addr, hp->h_length);
+		}
+	}
+	else
+	{
+		if (hints->ai_flags & AI_PASSIVE)
+			sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	}
+
+	if (service)
+		sin.sin_port = htons((unsigned short)atoi(service));
+
+	ai = malloc(sizeof(*ai));
+	if (!ai)
+		return EAI_MEMORY;
+	psin = malloc(sizeof(*psin));
+	if (!psin)
+	{
+		free(ai);
+		return EAI_MEMORY;
+	}
+
+	memcpy(psin, &sin, sizeof(sin));
+
+	ai->ai_family = hints->ai_family;
+	ai->ai_socktype = hints->ai_socktype;
+	ai->ai_protocol = hints->ai_protocol;
+	ai->ai_addrlen = sizeof(*psin);
+	ai->ai_addr = (struct sockaddr *) psin;
+	ai->ai_canonname = NULL;
+	ai->ai_next = NULL;
+
+	*res = ai;
+
+	return 0;
+}
+
+
+void
+freeaddrinfo(struct addrinfo *res)
+{
+	if (res)
+	{
+		if (res->ai_addr)
+			free(res->ai_addr);
+		free(res);
+	}
+}
+
+
+const char*
+gai_strerror(int errcode)
+{
+	int hcode;
+
+	switch (errcode)
+	{
+		case EAI_NONAME:
+			hcode = HOST_NOT_FOUND;
+			break;
+		case EAI_NODATA:
+			hcode = NO_DATA;
+			break;
+		case EAI_AGAIN:
+			hcode = TRY_AGAIN;
+			break;
+		case EAI_FAIL:
+		default:
+			hcode = NO_RECOVERY;
+			break;
+	}
+
+	return hstrerror(hcode);
+}