getaddrinfo.c File Reference

#include "c.h"
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "getaddrinfo.h"
#include "libpq/pqcomm.h"
#include "port/pg_bswap.h"

Include dependency graph for getaddrinfo.c:

Go to the source code of this file.

Functions
int	getaddrinfo (const char *node, const char *service, const struct addrinfo *hintp, struct addrinfo **res)
void	freeaddrinfo (struct addrinfo *res)
const char *	gai_strerror (int errcode)
int	getnameinfo (const struct sockaddr *sa, int salen, char *node, int nodelen, char *service, int servicelen, int flags)

Function Documentation

freeaddrinfo()

void freeaddrinfo

(

struct addrinfo *

res

)

Definition at line 256 of file getaddrinfo.c.

{
    if (res)
    {
#ifdef WIN32
 
        /*
         * If Windows has native IPv6 support, use the native Windows routine.
         * Otherwise, fall through and use our own code.
         */
        if (haveNativeWindowsIPv6routines())
        {
            (*freeaddrinfo_ptr) (res);
            return;
        }
#endif
 
        if (res->ai_addr)
            free(res->ai_addr);
        free(res);
    }
}

References free, and res.

gai_strerror()

const char* gai_strerror

(

int

errcode

)

Definition at line 281 of file getaddrinfo.c.

{
#ifdef HAVE_HSTRERROR
    int         hcode;
 
    switch (errcode)
    {
        case EAI_NONAME:
            hcode = HOST_NOT_FOUND;
            break;
        case EAI_AGAIN:
            hcode = TRY_AGAIN;
            break;
        case EAI_FAIL:
        default:
            hcode = NO_RECOVERY;
            break;
    }
 
    return hstrerror(hcode);
#else                           /* !HAVE_HSTRERROR */
 
    switch (errcode)
    {
        case EAI_NONAME:
            return "Unknown host";
        case EAI_AGAIN:
            return "Host name lookup failure";
            /* Errors below are probably WIN32 only */
#ifdef EAI_BADFLAGS
        case EAI_BADFLAGS:
            return "Invalid argument";
#endif
#ifdef EAI_FAMILY
        case EAI_FAMILY:
            return "Address family not supported";
#endif
#ifdef EAI_MEMORY
        case EAI_MEMORY:
            return "Not enough memory";
#endif
#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME /* MSVC/WIN64 duplicate */
        case EAI_NODATA:
            return "No host data of that type was found";
#endif
#ifdef EAI_SERVICE
        case EAI_SERVICE:
            return "Class type not found";
#endif
#ifdef EAI_SOCKTYPE
        case EAI_SOCKTYPE:
            return "Socket type not supported";
#endif
        default:
            return "Unknown server error";
    }
#endif                          /* HAVE_HSTRERROR */
}

References EAI_AGAIN, EAI_BADFLAGS, EAI_FAIL, EAI_FAMILY, EAI_MEMORY, EAI_NONAME, EAI_SERVICE, EAI_SOCKTYPE, and errcode().

getaddrinfo()

int getaddrinfo	(	const char *	node,
		const char *	service,
		const struct addrinfo *	hintp,
		struct addrinfo **	res
	)

Definition at line 128 of file getaddrinfo.c.

{
    struct addrinfo *ai;
    struct sockaddr_in sin,
               *psin;
    struct addrinfo hints;
 
#ifdef WIN32
 
    /*
     * If Windows has native IPv6 support, use the native Windows routine.
     * Otherwise, fall through and use our own code.
     */
    if (haveNativeWindowsIPv6routines())
        return (*getaddrinfo_ptr) (node, service, hintp, res);
#endif
 
    if (hintp == NULL)
    {
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = AF_INET;
        hints.ai_socktype = SOCK_STREAM;
    }
    else
        memcpy(&hints, hintp, sizeof(hints));
 
    if (hints.ai_family != AF_INET && hints.ai_family != AF_UNSPEC)
        return EAI_FAMILY;
 
    if (hints.ai_socktype == 0)
        hints.ai_socktype = SOCK_STREAM;
 
    if (!node && !service)
        return EAI_NONAME;
 
    memset(&sin, 0, sizeof(sin));
 
    sin.sin_family = AF_INET;
 
    if (node)
    {
        if (node[0] == '\0')
            sin.sin_addr.s_addr = pg_hton32(INADDR_ANY);
        else if (hints.ai_flags & AI_NUMERICHOST)
        {
            if (!inet_aton(node, &sin.sin_addr))
                return EAI_NONAME;
        }
        else
        {
            struct hostent *hp;
 
#ifdef FRONTEND
            struct hostent hpstr;
            char        buf[BUFSIZ];
            int         herrno = 0;
 
            pqGethostbyname(node, &hpstr, buf, sizeof(buf),
                            &hp, &herrno);
#else
            hp = gethostbyname(node);
#endif
            if (hp == NULL)
            {
                switch (h_errno)
                {
                    case HOST_NOT_FOUND:
                    case NO_DATA:
                        return EAI_NONAME;
                    case TRY_AGAIN:
                        return EAI_AGAIN;
                    case NO_RECOVERY:
                    default:
                        return EAI_FAIL;
                }
            }
            if (hp->h_addrtype != AF_INET)
                return EAI_FAIL;
 
            memcpy(&(sin.sin_addr), hp->h_addr, hp->h_length);
        }
    }
    else
    {
        if (hints.ai_flags & AI_PASSIVE)
            sin.sin_addr.s_addr = pg_hton32(INADDR_ANY);
        else
            sin.sin_addr.s_addr = pg_hton32(INADDR_LOOPBACK);
    }
 
    if (service)
        sin.sin_port = pg_hton16((unsigned short) atoi(service));
 
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
    sin.sin_len = sizeof(sin);
#endif
 
    ai = malloc(sizeof(*ai));
    if (!ai)
        return EAI_MEMORY;
 
    psin = malloc(sizeof(*psin));
    if (!psin)
    {
        free(ai);
        return EAI_MEMORY;
    }
 
    memcpy(psin, &sin, sizeof(*psin));
 
    ai->ai_flags = 0;
    ai->ai_family = AF_INET;
    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;
}

References addrinfo::ai_addr, addrinfo::ai_addrlen, addrinfo::ai_canonname, addrinfo::ai_family, addrinfo::ai_flags, addrinfo::ai_next, AI_NUMERICHOST, AI_PASSIVE, addrinfo::ai_protocol, addrinfo::ai_socktype, buf, EAI_AGAIN, EAI_FAIL, EAI_FAMILY, EAI_MEMORY, EAI_NONAME, free, inet_aton(), malloc, pg_hton16, pg_hton32, and res.

getnameinfo()

int getnameinfo	(	const struct sockaddr *	sa,
		int	salen,
		char *	node,
		int	nodelen,
		char *	service,
		int	servicelen,
		int	flags
	)

Definition at line 348 of file getaddrinfo.c.

{
#ifdef WIN32
 
    /*
     * If Windows has native IPv6 support, use the native Windows routine.
     * Otherwise, fall through and use our own code.
     */
    if (haveNativeWindowsIPv6routines())
        return (*getnameinfo_ptr) (sa, salen, node, nodelen,
                                   service, servicelen, flags);
#endif
 
    /* Invalid arguments. */
    if (sa == NULL || (node == NULL && service == NULL))
        return EAI_FAIL;
 
#ifdef  HAVE_IPV6
    if (sa->sa_family == AF_INET6)
        return EAI_FAMILY;
#endif
 
    /* Unsupported flags. */
    if (flags & NI_NAMEREQD)
        return EAI_AGAIN;
 
    if (node)
    {
        if (sa->sa_family == AF_INET)
        {
            if (pg_inet_net_ntop(AF_INET,
                                 &((struct sockaddr_in *) sa)->sin_addr,
                                 sa->sa_family == AF_INET ? 32 : 128,
                                 node, nodelen) == NULL)
                return EAI_MEMORY;
        }
        else
            return EAI_MEMORY;
    }
 
    if (service)
    {
        int         ret = -1;
 
        if (sa->sa_family == AF_INET)
        {
            ret = snprintf(service, servicelen, "%d",
                           pg_ntoh16(((struct sockaddr_in *) sa)->sin_port));
        }
        if (ret < 0 || ret >= servicelen)
            return EAI_MEMORY;
    }
 
    return 0;
}

References EAI_AGAIN, EAI_FAIL, EAI_FAMILY, EAI_MEMORY, NI_NAMEREQD, pg_inet_net_ntop(), pg_ntoh16, and snprintf.