#include "postgres.h"
#include <unistd.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/file.h>
#include "common/ip.h"

Include dependency graph for ip.c:

Functions
static int	getaddrinfo_unix (const char path, const struct addrinfo hintsp, struct addrinfo **result)

static int	getnameinfo_unix (const struct sockaddr_un sa, int salen, char node, int nodelen, char *service, int servicelen, int flags)

int	pg_getaddrinfo_all (const char hostname, const char servname, const struct addrinfo hintp, struct addrinfo *result)

void	pg_freeaddrinfo_all (int hint_ai_family, struct addrinfo *ai)

int	pg_getnameinfo_all (const struct sockaddr_storage addr, int salen, char node, int nodelen, char *service, int servicelen, int flags)

Function Documentation

◆ getaddrinfo_unix()

static int getaddrinfo_unix	(	const char *	path,
		const struct addrinfo *	hintsp,
		struct addrinfo **	result
	)

static

Definition at line 156 of file ip.c.

{
    struct addrinfo hints = {0};
    struct addrinfo *aip;
    struct sockaddr_un *unp;
 
    *result = NULL;
 
    if (strlen(path) >= sizeof(unp->sun_path))
        return EAI_FAIL;
 
    if (hintsp == NULL)
    {
        hints.ai_family = AF_UNIX;
        hints.ai_socktype = SOCK_STREAM;
    }
    else
        memcpy(&hints, hintsp, sizeof(hints));
 
    if (hints.ai_socktype == 0)
        hints.ai_socktype = SOCK_STREAM;
 
    if (hints.ai_family != AF_UNIX)
    {
        /* shouldn't have been called */
        return EAI_FAIL;
    }
 
    aip = calloc(1, sizeof(struct addrinfo));
    if (aip == NULL)
        return EAI_MEMORY;
 
    unp = calloc(1, sizeof(struct sockaddr_un));
    if (unp == NULL)
    {
        free(aip);
        return EAI_MEMORY;
    }
 
    aip->ai_family = AF_UNIX;
    aip->ai_socktype = hints.ai_socktype;
    aip->ai_protocol = hints.ai_protocol;
    aip->ai_next = NULL;
    aip->ai_canonname = NULL;
    *result = aip;
 
    unp->sun_family = AF_UNIX;
    aip->ai_addr = (struct sockaddr *) unp;
    aip->ai_addrlen = sizeof(struct sockaddr_un);
 
    strcpy(unp->sun_path, path);
 
    /*
     * If the supplied path starts with @, replace that with a zero byte for
     * the internal representation.  In that mode, the entire sun_path is the
     * address, including trailing zero bytes.  But we set the address length
     * to only include the length of the original string.  That way the
     * trailing zero bytes won't show up in any network or socket lists of the
     * operating system.  This is just a convention, also followed by other
     * packages.
     */
    if (path[0] == '@')
    {
        unp->sun_path[0] = '\0';
        aip->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(path);
    }
 
    return 0;
}

References calloc, free, sockaddr_un::sun_family, and sockaddr_un::sun_path.

Referenced by pg_getaddrinfo_all().

◆ getnameinfo_unix()

static int getnameinfo_unix	(	const struct sockaddr_un *	sa,
		int	salen,
		char *	node,
		int	nodelen,
		char *	service,
		int	servicelen,
		int	flags
	)

static

Definition at line 231 of file ip.c.

{
    int         ret;
 
    /* Invalid arguments. */
    if (sa == NULL || sa->sun_family != AF_UNIX ||
        (node == NULL && service == NULL))
        return EAI_FAIL;
 
    if (node)
    {
        ret = snprintf(node, nodelen, "%s", "[local]");
        if (ret < 0 || ret >= nodelen)
            return EAI_MEMORY;
    }
 
    if (service)
    {
        /*
         * Check whether it looks like an abstract socket, but it could also
         * just be an empty string.
         */
        if (sa->sun_path[0] == '\0' && sa->sun_path[1] != '\0')
            ret = snprintf(service, servicelen, "@%s", sa->sun_path + 1);
        else
            ret = snprintf(service, servicelen, "%s", sa->sun_path);
        if (ret < 0 || ret >= servicelen)
            return EAI_MEMORY;
    }
 
    return 0;
}

References snprintf.

Referenced by pg_getnameinfo_all().

◆ pg_freeaddrinfo_all()

void pg_freeaddrinfo_all	(	int	hint_ai_family,
		struct addrinfo *	ai
	)

Definition at line 85 of file ip.c.

{
    if (hint_ai_family == AF_UNIX)
    {
        /* struct was built by getaddrinfo_unix (see pg_getaddrinfo_all) */
        while (ai != NULL)
        {
            struct addrinfo *p = ai;
 
            ai = ai->ai_next;
            free(p->ai_addr);
            free(p);
        }
    }
    else
    {
        /* struct was built by getaddrinfo() */
        if (ai != NULL)
            freeaddrinfo(ai);
    }
}

References free.

Referenced by ident_inet(), ListenServerPort(), parse_hba_auth_opt(), parse_hba_line(), PerformRadiusTransaction(), and PQconnectPoll().

◆ pg_getaddrinfo_all()

int pg_getaddrinfo_all	(	const char *	hostname,
		const char *	servname,
		const struct addrinfo *	hintp,
		struct addrinfo **	result
	)

Definition at line 56 of file ip.c.

{
    int         rc;
 
    /* not all versions of getaddrinfo() zero *result on failure */
    *result = NULL;
 
    if (hintp->ai_family == AF_UNIX)
        return getaddrinfo_unix(servname, hintp, result);
 
    /* NULL has special meaning to getaddrinfo(). */
    rc = getaddrinfo((!hostname || hostname[0] == '\0') ? NULL : hostname,
                     servname, hintp, result);
 
    return rc;
}

References getaddrinfo_unix(), and hostname.

Referenced by ident_inet(), ListenServerPort(), parse_hba_auth_opt(), parse_hba_line(), PerformRadiusTransaction(), and PQconnectPoll().

◆ pg_getnameinfo_all()

int pg_getnameinfo_all	(	const struct sockaddr_storage *	addr,
		int	salen,
		char *	node,
		int	nodelen,
		char *	service,
		int	servicelen,
		int	flags
	)

Definition at line 117 of file ip.c.

{
    int         rc;
 
    if (addr && addr->ss_family == AF_UNIX)
        rc = getnameinfo_unix((const struct sockaddr_un *) addr, salen,
                              node, nodelen,
                              service, servicelen,
                              flags);
    else
        rc = getnameinfo((const struct sockaddr *) addr, salen,
                         node, nodelen,
                         service, servicelen,
                         flags);
 
    if (rc != 0)
    {
        if (node)
            strlcpy(node, "???", nodelen);
        if (service)
            strlcpy(service, "???", servicelen);
    }
 
    return rc;
}

References getnameinfo_unix(), and strlcpy().