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#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#ifndef HAVE_GETADDRINFO
#ifndef FAI_PREFIX
# error "FAI_PREFIX must be defined when fake-addrinfo.h is included"
#endif
#define FAI_CONCAT(A,B) FAI_CONCAT2(A,B)
#define FAI_CONCAT2(A,B) A ## B
#undef getaddrinfo
#define getaddrinfo FAI_CONCAT(FAI_PREFIX, _fake_getaddrinfo)
#undef getnameinfo
#define getnameinfo FAI_CONCAT(FAI_PREFIX, _fake_getnameinfo)
#undef freeaddrinfo
#define freeaddrinfo FAI_CONCAT(FAI_PREFIX, _fake_freeaddrinfo)
#undef gai_strerror
#define gai_strerror FAI_CONCAT(FAI_PREFIX, _fake_gai_strerror)
#undef addrinfo
#define addrinfo FAI_CONCAT(FAI_PREFIX, _fake_addrinfo)
struct addrinfo {
int ai_family; /* PF_foo */
int ai_socktype; /* SOCK_foo */
int ai_protocol; /* 0, IPPROTO_foo */
int ai_flags; /* AI_PASSIVE etc */
size_t ai_addrlen; /* real length of socket address */
char *ai_canonname; /* canonical name of host */
struct sockaddr *ai_addr; /* pointer to variable-size address */
struct addrinfo *ai_next; /* next in linked list */
};
#undef AI_PASSIVE
#define AI_PASSIVE 0x01
#undef AI_CANONNAME
#define AI_CANONNAME 0x02
#undef AI_NUMERICHOST
#define AI_NUMERICHOST 0x04
#undef AI_V4MAPPED
#define AI_V4MAPPED 0x08 /* ignored */
#undef AI_ADDRCONFIG
#define AI_ADDRCONFIG 0x10 /* ignored */
#undef AI_ALL
#define AI_ALL 0x20 /* ignored */
#define AI_DEFAULT (AI_V4MAPPED | AI_ADDRCONFIG)
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif
#ifndef NI_MAXSERV
#define NI_MAXSERV 32
#endif
#undef NI_NUMERICHOST
#define NI_NUMERICHOST 0x01
#undef NI_NUMERICSERV
#define NI_NUMERICSERV 0x02
#undef NI_NAMEREQD
#define NI_NAMEREQD 0x04
#undef NI_DGRAM
#define NI_DGRAM 0x08
#undef NI_NOFQDN
#define NI_NOFQDN 0x10
#undef EAI_ADDRFAMILY
#define EAI_ADDRFAMILY 1
#undef EAI_AGAIN
#define EAI_AGAIN 2
#undef EAI_BADFLAGS
#define EAI_BADFLAGS 3
#undef EAI_FAIL
#define EAI_FAIL 4
#undef EAI_FAMILY
#define EAI_FAMILY 5
#undef EAI_MEMORY
#define EAI_MEMORY 6
#undef EAI_NODATA
#define EAI_NODATA 7
#undef EAI_NONAME
#define EAI_NONAME 8
#undef EAI_SERVICE
#define EAI_SERVICE 9
#undef EAI_SOCKTYPE
#define EAI_SOCKTYPE 10
#undef EAI_SYSTEM
#define EAI_SYSTEM 11
int getaddrinfo (const char *name, const char *serv,
const struct addrinfo *hint, struct addrinfo **result);
int getnameinfo (const struct sockaddr *addr, socklen_t len,
char *host, size_t hostlen,
char *service, size_t servicelen,
int flags);
void freeaddrinfo (struct addrinfo *ai);
char *gai_strerror (int code);
#ifdef FAI_IMPLEMENTATION
static int translate_h_errno (int h);
static int fai_add_entry (struct addrinfo **result, void *addr, int port,
const struct addrinfo *template)
{
struct addrinfo *n = malloc (sizeof (struct addrinfo));
struct sockaddr_in *sin4;
if (n == 0)
return EAI_MEMORY;
if (template->ai_family != AF_INET)
return EAI_FAMILY;
*n = *template;
sin4 = malloc (sizeof (struct sockaddr_in));
if (sin4 == 0)
return EAI_MEMORY;
n->ai_addr = (struct sockaddr *) sin4;
sin4->sin_family = AF_INET;
sin4->sin_addr = *(struct in_addr *)addr;
sin4->sin_port = port;
#ifdef HAVE_SA_LEN
sin4->sin_len = sizeof (struct sockaddr_in);
#endif
n->ai_next = *result;
*result = n;
return 0;
}
static int fai_add_hosts_by_name (const char *name, int af,
struct addrinfo *template,
int portnum, int flags,
struct addrinfo **result)
{
struct hostent *hp;
int i, r;
if (af != AF_INET)
/* For now, real ipv6 support needs real getaddrinfo. */
return EAI_FAMILY;
hp = gethostbyname (name);
if (hp == 0)
return translate_h_errno (h_errno);
for (i = 0; hp->h_addr_list[i]; i++) {
r = fai_add_entry (result, hp->h_addr_list[i], portnum, template);
if (r)
return r;
}
if (*result && (flags & AI_CANONNAME))
(*result)->ai_canonname = strdup (hp->h_name);
return 0;
}
int getaddrinfo (const char *name, const char *serv,
const struct addrinfo *hint, struct addrinfo **result)
{
struct addrinfo *res = 0;
int ret;
int port = 0, socktype;
int flags;
struct addrinfo template;
if (hint != 0) {
if (hint->ai_family != 0 && hint->ai_family != AF_INET)
return EAI_NODATA;
socktype = hint->ai_socktype;
flags = hint->ai_flags;
} else {
socktype = 0;
flags = 0;
}
if (serv) {
size_t numlen = strspn (serv, "0123456789");
if (serv[numlen] == '\0') {
/* pure numeric */
unsigned long p = strtoul (serv, 0, 10);
if (p == 0 || p > 65535)
return EAI_NONAME;
port = htons (p);
} else {
struct servent *sp;
int try_dgram_too = 0;
if (socktype == 0) {
try_dgram_too = 1;
socktype = SOCK_STREAM;
}
try_service_lookup:
sp = getservbyname (serv, socktype == SOCK_STREAM ? "tcp" : "udp");
if (sp == 0) {
if (try_dgram_too) {
socktype = SOCK_DGRAM;
goto try_service_lookup;
}
return EAI_SERVICE;
}
port = sp->s_port;
}
}
if (name == 0) {
name = (flags & AI_PASSIVE) ? "0.0.0.0" : "127.0.0.1";
flags |= AI_NUMERICHOST;
}
template.ai_family = AF_INET;
template.ai_addrlen = sizeof (struct sockaddr_in);
template.ai_socktype = socktype;
template.ai_protocol = 0;
template.ai_flags = 0;
template.ai_canonname = 0;
template.ai_next = 0;
template.ai_addr = 0;
/* If NUMERICHOST is set, parse a numeric address.
If it's not set, don't accept such names. */
if (flags & AI_NUMERICHOST) {
struct in_addr addr4;
ret = inet_aton (name, &addr4);
if (ret)
return EAI_NONAME;
ret = fai_add_entry (&res, &addr4, port, &template);
} else {
ret = fai_add_hosts_by_name (name, AF_INET, &template, port, flags,
&res);
}
if (ret && ret != NO_ADDRESS) {
freeaddrinfo (res);
return ret;
}
if (res == 0)
return NO_ADDRESS;
*result = res;
return 0;
}
int getnameinfo (const struct sockaddr *sa, socklen_t len,
char *host, size_t hostlen,
char *service, size_t servicelen,
int flags)
{
struct hostent *hp;
const struct sockaddr_in *sinp;
struct servent *sp;
if (sa->sa_family != AF_INET) {
return EAI_FAMILY;
}
sinp = (const struct sockaddr_in *) sa;
if (host) {
if (flags & NI_NUMERICHOST) {
char *p;
numeric_host:
p = inet_ntoa (sinp->sin_addr);
if (strlen (p) < hostlen)
strcpy (host, p);
else
return EAI_FAIL; /* ?? */
} else {
hp = gethostbyaddr (&sinp->sin_addr, sizeof (struct in_addr),
AF_INET);
if (hp == 0) {
if (h_errno == NO_ADDRESS && !(flags & NI_NAMEREQD)) /* ??? */
goto numeric_host;
return translate_h_errno (h_errno);
}
if (strlen (hp->h_name) < hostlen)
strcpy (host, hp->h_name);
else
return EAI_FAIL; /* ?? */
}
}
if (service) {
if (flags & NI_NUMERICSERV) {
char numbuf[10];
int port;
numeric_service:
port = ntohs (sinp->sin_port);
if (port < 0 || port > 65535)
return EAI_FAIL;
sprintf (numbuf, "%d", port);
if (strlen (numbuf) < servicelen)
strcpy (service, numbuf);
else
return EAI_FAIL;
} else {
sp = getservbyport (sinp->sin_port,
(flags & NI_DGRAM) ? "udp" : "tcp");
if (sp == 0)
goto numeric_service;
if (strlen (sp->s_name) < servicelen)
strcpy (service, sp->s_name);
else
return EAI_FAIL;
}
}
return 0;
}
void freeaddrinfo (struct addrinfo *ai)
{
struct addrinfo *next;
while (ai) {
next = ai->ai_next;
free (ai->ai_canonname);
free (ai->ai_addr);
free (ai);
ai = next;
}
}
char *gai_strerror (int code)
{
switch (code) {
case EAI_ADDRFAMILY: return "address family for nodename not supported";
case EAI_AGAIN: return "temporary failure in name resolution";
case EAI_BADFLAGS: return "bad flags to getaddrinfo/getnameinfo";
case EAI_FAIL: return "non-recoverable failure in name resolution";
case EAI_FAMILY: return "ai_family not supported";
case EAI_MEMORY: return "out of memory";
case EAI_NODATA: return "no address associated with hostname";
case EAI_NONAME: return "name does not exist";
case EAI_SERVICE: return "service name not supported for specified socket type";
case EAI_SOCKTYPE: return "ai_socktype not supported";
case EAI_SYSTEM: return strerror (errno);
default: return "bogus getaddrinfo error?";
}
}
static int translate_h_errno (int h)
{
switch (h) {
case 0:
return 0;
#ifdef NETDB_INTERNAL
case NETDB_INTERNAL:
if (errno == ENOMEM)
return EAI_MEMORY;
return EAI_SYSTEM;
#endif
case HOST_NOT_FOUND:
return EAI_NONAME;
case TRY_AGAIN:
return EAI_AGAIN;
case NO_RECOVERY:
return EAI_FAIL;
case NO_DATA:
#if NO_DATA != NO_ADDRESS
case NO_ADDRESS:
#endif
return EAI_NODATA;
}
}
#endif /* FAI_IMPLEMENTATION */
#define HAVE_GETADDRINFO /* fake it */
#define HAVE_GETNAMEINFO /* well, soon... */
#endif /* HAVE_GETADDRINFO */
/* Fudge things on older gai implementations. */
#ifndef AI_DEFAULT
# define AI_DEFAULT 0 /* (AI_V4MAPPED | AI_ADDRCONFIG) */
#endif
|
