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sim_sock.c
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sim_sock.c
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/* sim_sock.c: OS-dependent socket routines
Copyright (c) 2001-2010, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
15-Oct-12 MP Added definitions needed to detect possible tcp
connect failures
25-Sep-12 MP Reworked for RFC3493 interfaces supporting IPv6 and IPv4
22-Jun-10 RMS Fixed types in sim_accept_conn (from Mark Pizzolato)
19-Nov-05 RMS Added conditional for OpenBSD (from Federico G. Schwindt)
16-Aug-05 RMS Fixed spurious SIGPIPE signal error in Unix
14-Apr-05 RMS Added WSAEINPROGRESS test (from Tim Riker)
09-Jan-04 RMS Fixed typing problem in Alpha Unix (found by Tim Chapman)
17-Apr-03 RMS Fixed non-implemented version of sim_close_sock
(found by Mark Pizzolato)
17-Dec-02 RMS Added sim_connect_socket, sim_create_socket
08-Oct-02 RMS Revised for .NET compatibility
22-Aug-02 RMS Changed calling sequence for sim_accept_conn
22-May-02 RMS Added OS2 EMX support from Holger Veit
06-Feb-02 RMS Added VMS support from Robert Alan Byer
16-Sep-01 RMS Added Macintosh support from Peter Schorn
02-Sep-01 RMS Fixed UNIX bugs found by Mirian Lennox and Tom Markson
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "sim_sock.h"
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(AF_INET6) && defined(_WIN32)
#include <ws2tcpip.h>
#endif
#ifdef SIM_HAVE_DLOPEN
#include <dlfcn.h>
#endif
#ifndef WSAAPI
#define WSAAPI
#endif
#if defined(SHUT_RDWR) && !defined(SD_BOTH)
#define SD_BOTH SHUT_RDWR
#endif
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif
/* OS dependent routines
sim_master_sock create master socket
sim_connect_sock connect a socket to a remote destination
sim_connect_sock_ex connect a socket to a remote destination
sim_accept_conn accept connection
sim_read_sock read from socket
sim_write_sock write from socket
sim_close_sock close socket
sim_setnonblock set socket non-blocking
*/
/* First, all the non-implemented versions */
#if defined (__OS2__) && !defined (__EMX__)
void sim_init_sock (void)
{
}
void sim_cleanup_sock (void)
{
}
SOCKET sim_master_sock_ex (const char *hostport, int *parse_status, int opt_flags)
{
return INVALID_SOCKET;
}
SOCKET sim_connect_sock_ex (const char *sourcehostport, const char *hostport, const char *default_host, const char *default_port, int opt_flags)
{
return INVALID_SOCKET;
}
SOCKET sim_accept_conn (SOCKET master, char **connectaddr);
{
return INVALID_SOCKET;
}
int sim_read_sock (SOCKET sock, char *buf, int nbytes)
{
return -1;
}
int sim_write_sock (SOCKET sock, char *msg, int nbytes)
{
return 0;
}
void sim_close_sock (SOCKET sock)
{
return;
}
#else /* endif unimpl */
/* UNIX, Win32, Macintosh, VMS, OS2 (Berkeley socket) routines */
static struct sock_errors {
int value;
const char *text;
} sock_errors[] = {
{WSAEWOULDBLOCK, "Operation would block"},
{WSAENAMETOOLONG, "File name too long"},
{WSAEINPROGRESS, "Operation now in progress "},
{WSAETIMEDOUT, "Connection timed out"},
{WSAEISCONN, "Transport endpoint is already connected"},
{WSAECONNRESET, "Connection reset by peer"},
{WSAECONNREFUSED, "Connection refused"},
{WSAECONNABORTED, "Connection aborted"},
{WSAEHOSTUNREACH, "No route to host"},
{WSAEADDRINUSE, "Address already in use"},
#if defined (WSAEAFNOSUPPORT)
{WSAEAFNOSUPPORT, "Address family not supported by protocol"},
#endif
{WSAEACCES, "Permission denied"},
{0, NULL}
};
const char *sim_get_err_sock (const char *emsg)
{
int err = WSAGetLastError ();
int i;
static char err_buf[512];
for (i=0; (sock_errors[i].text) && (sock_errors[i].value != err); i++)
;
if (sock_errors[i].value == err)
sprintf (err_buf, "Sockets: %s error %d - %s\n", emsg, err, sock_errors[i].text);
else
#if defined(_WIN32)
sprintf (err_buf, "Sockets: %s error %d\n", emsg, err);
#else
sprintf (err_buf, "Sockets: %s error %d - %s\n", emsg, err, strerror(err));
#endif
return err_buf;
}
SOCKET sim_err_sock (SOCKET s, const char *emsg)
{
sim_printf ("%s", sim_get_err_sock (emsg));
if (s != INVALID_SOCKET) {
int err = WSAGetLastError ();
sim_close_sock (s);
WSASetLastError (err); /* Retain Original socket error value */
}
return INVALID_SOCKET;
}
typedef void (WSAAPI *freeaddrinfo_func) (struct addrinfo *ai);
static freeaddrinfo_func p_freeaddrinfo;
typedef int (WSAAPI *getaddrinfo_func) (const char *hostname,
const char *service,
const struct addrinfo *hints,
struct addrinfo **res);
static getaddrinfo_func p_getaddrinfo;
#if defined(VMS)
typedef size_t socklen_t;
#if !defined(EAI_OVERFLOW)
#define EAI_OVERFLOW EAI_FAIL
#endif
#endif
#if defined(__hpux)
#if !defined(EAI_OVERFLOW)
#define EAI_OVERFLOW EAI_FAIL
#endif
#endif
typedef int (WSAAPI *getnameinfo_func) (const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags);
static getnameinfo_func p_getnameinfo;
static void WSAAPI s_freeaddrinfo (struct addrinfo *ai)
{
struct addrinfo *a, *an;
for (a=ai; a != NULL; a=an) {
an = a->ai_next;
free (a->ai_canonname);
free (a->ai_addr);
free (a);
}
}
static int WSAAPI s_getaddrinfo (const char *hostname,
const char *service,
const struct addrinfo *hints,
struct addrinfo **res)
{
struct hostent *he;
struct servent *se = NULL;
struct sockaddr_in *sin;
struct addrinfo *result = NULL;
struct addrinfo *ai, *lai = NULL;
struct addrinfo dhints;
struct in_addr ipaddr;
struct in_addr *fixed[2];
struct in_addr **ips = NULL;
struct in_addr **ip;
const char *cname = NULL;
int port = 0;
// Validate parameters
if ((hostname == NULL) && (service == NULL))
return EAI_NONAME;
if (hints) {
if ((hints->ai_family != PF_INET) && (hints->ai_family != PF_UNSPEC))
return EAI_FAMILY;
switch (hints->ai_socktype)
{
default:
return EAI_SOCKTYPE;
case SOCK_DGRAM:
case SOCK_STREAM:
case 0:
break;
}
}
else {
hints = &dhints;
memset(&dhints, 0, sizeof(dhints));
dhints.ai_family = PF_UNSPEC;
}
if (service) {
char *c;
port = strtoul(service, &c, 10);
port = htons((unsigned short)port);
if ((port == 0) || (*c != '\0')) {
switch (hints->ai_socktype)
{
case SOCK_DGRAM:
se = getservbyname(service, "udp");
break;
case SOCK_STREAM:
case 0:
se = getservbyname(service, "tcp");
break;
}
if (NULL == se)
return EAI_SERVICE;
port = se->s_port;
}
}
if (hostname) {
if ((0xffffffff != (ipaddr.s_addr = inet_addr(hostname))) ||
(0 == strcmp("255.255.255.255", hostname))) {
fixed[0] = &ipaddr;
fixed[1] = NULL;
if ((hints->ai_flags & AI_CANONNAME) && !(hints->ai_flags & AI_NUMERICHOST)) {
he = gethostbyaddr((char *)&ipaddr, 4, AF_INET);
if (NULL != he)
cname = he->h_name;
else
cname = hostname;
}
ips = fixed;
}
else {
if (hints->ai_flags & AI_NUMERICHOST)
return EAI_NONAME;
he = gethostbyname(hostname);
if (he) {
ips = (struct in_addr **)he->h_addr_list;
if (hints->ai_flags & AI_CANONNAME)
cname = he->h_name;
}
else {
switch (h_errno)
{
case HOST_NOT_FOUND:
case NO_DATA:
return EAI_NONAME;
case TRY_AGAIN:
return EAI_AGAIN;
default:
return EAI_FAIL;
}
}
}
}
else {
if (hints->ai_flags & AI_PASSIVE)
ipaddr.s_addr = htonl(INADDR_ANY);
else
ipaddr.s_addr = htonl(INADDR_LOOPBACK);
fixed[0] = &ipaddr;
fixed[1] = NULL;
ips = fixed;
}
for (ip=ips; (ip != NULL) && (*ip != NULL); ++ip) {
ai = (struct addrinfo *)calloc(1, sizeof(*ai));
if (NULL == ai) {
s_freeaddrinfo(result);
return EAI_MEMORY;
}
ai->ai_family = PF_INET;
ai->ai_socktype = hints->ai_socktype;
ai->ai_protocol = hints->ai_protocol;
ai->ai_addr = NULL;
ai->ai_addrlen = sizeof(struct sockaddr_in);
ai->ai_canonname = NULL;
ai->ai_next = NULL;
ai->ai_addr = (struct sockaddr *)calloc(1, sizeof(struct sockaddr_in));
if (NULL == ai->ai_addr) {
free(ai);
s_freeaddrinfo(result);
return EAI_MEMORY;
}
sin = (struct sockaddr_in *)ai->ai_addr;
sin->sin_family = PF_INET;
sin->sin_port = (unsigned short)port;
memcpy(&sin->sin_addr, *ip, sizeof(sin->sin_addr));
if (NULL == result)
result = ai;
else
lai->ai_next = ai;
lai = ai;
}
if (cname) {
result->ai_canonname = (char *)calloc(1, strlen(cname)+1);
if (NULL == result->ai_canonname) {
s_freeaddrinfo(result);
return EAI_MEMORY;
}
strcpy(result->ai_canonname, cname);
}
*res = result;
return 0;
}
#ifndef EAI_OVERFLOW
#define EAI_OVERFLOW WSAENAMETOOLONG
#endif
static int WSAAPI s_getnameinfo (const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen,
int flags)
{
struct hostent *he;
struct servent *se = NULL;
const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
if (sin->sin_family != PF_INET)
return EAI_FAMILY;
if ((NULL == host) && (NULL == serv))
return EAI_NONAME;
if ((serv) && (servlen > 0)) {
if (flags & NI_NUMERICSERV)
se = NULL;
else
if (flags & NI_DGRAM)
se = getservbyport(sin->sin_port, "udp");
else
se = getservbyport(sin->sin_port, "tcp");
if (se) {
if (servlen <= strlen(se->s_name))
return EAI_OVERFLOW;
strcpy(serv, se->s_name);
}
else {
char buf[16];
sprintf(buf, "%d", ntohs(sin->sin_port));
if (servlen <= strlen(buf))
return EAI_OVERFLOW;
strcpy(serv, buf);
}
}
if ((host) && (hostlen > 0)) {
if (flags & NI_NUMERICHOST)
he = NULL;
else
he = gethostbyaddr((const char *)&sin->sin_addr, 4, AF_INET);
if (he) {
if (hostlen < strlen(he->h_name)+1)
return EAI_OVERFLOW;
strcpy(host, he->h_name);
}
else {
if (flags & NI_NAMEREQD)
return EAI_NONAME;
if (hostlen < strlen(inet_ntoa(sin->sin_addr))+1)
return EAI_OVERFLOW;
strcpy(host, inet_ntoa(sin->sin_addr));
}
}
return 0;
}
#if defined(_WIN32) || defined(__CYGWIN__)
#if !defined(IPV6_V6ONLY) /* Older XP environments may not define IPV6_V6ONLY */
#define IPV6_V6ONLY 27 /* Treat wildcard bind as AF_INET6-only. */
#endif
#if defined(TEST_INFO_STUBS)
#undef IPV6_V6ONLY
#undef AF_INET6
#endif
/* Dynamic DLL load variables */
#ifdef _WIN32
static HINSTANCE hLib = 0; /* handle to DLL */
#else
static void *hLib = NULL; /* handle to Library */
#endif
static int lib_loaded = 0; /* 0=not loaded, 1=loaded, 2=library load failed, 3=Func load failed */
static const char* lib_name = "Ws2_32.dll";
/* load function pointer from DLL */
typedef int (*_func)();
static void load_function(const char* function, _func* func_ptr) {
#ifdef _WIN32
*func_ptr = (_func)GetProcAddress(hLib, function);
#else
*func_ptr = (_func)dlsym(hLib, function);
#endif
if (*func_ptr == 0) {
sim_printf ("Sockets: Failed to find function '%s' in %s\r\n", function, lib_name);
lib_loaded = 3;
}
}
/* load Ws2_32.dll as required */
int load_ws2(void) {
switch(lib_loaded) {
case 0: /* not loaded */
/* attempt to load DLL */
#ifdef _WIN32
hLib = LoadLibraryA(lib_name);
#else
hLib = dlopen(lib_name, RTLD_NOW);
#endif
if (hLib == 0) {
/* failed to load DLL */
sim_printf ("Sockets: Failed to load %s\r\n", lib_name);
lib_loaded = 2;
break;
} else {
/* library loaded OK */
lib_loaded = 1;
}
/* load required functions; sets dll_load=3 on error */
load_function("getaddrinfo", (_func *) &p_getaddrinfo);
load_function("getnameinfo", (_func *) &p_getnameinfo);
load_function("freeaddrinfo", (_func *) &p_freeaddrinfo);
if (lib_loaded != 1) {
/* unsuccessful load, connect stubs */
p_getaddrinfo = (getaddrinfo_func)s_getaddrinfo;
p_getnameinfo = (getnameinfo_func)s_getnameinfo;
p_freeaddrinfo = (freeaddrinfo_func)s_freeaddrinfo;
}
break;
default: /* loaded or failed */
break;
}
return (lib_loaded == 1) ? 1 : 0;
}
#endif
/* OS independent routines
sim_parse_addr parse a hostname/ipaddress from port and apply defaults
and optionally validate an address match
sim_addr_acl_check parse a hostname/ipaddress (possibly in CIDR form) and
test against an acl
*/
/* sim_parse_addr host:port
Presumption is that the cptr input, if it doesn't contain a ':' character
is a port specifier. If the host field contains one or more colon characters
(i.e. it is an IPv6 address), the IPv6 address MUST be enclosed in square
bracket characters (i.e. Domain Literal format)
Inputs:
cptr = pointer to input string
host = optional pointer to host buffer
host_len = length of host buffer
default_host = optional pointer to default host if none specified
in cptr
port = optional pointer to port buffer
port_len = length of port buffer
default_port = optional pointer to default port if none specified
in cptr
validate_addr = optional name/addr which is checked to be equivalent
to the host result of parsing the other input. This
address would usually be returned by sim_accept_conn.
The validate_addr can also be a CIDR address specifier
which will match against the provided host.
If the validate_addr is provided with cptr as NULL,
the validate_addr is parsed for reasonableness and
the result returned with 0 indicating a reasonable
value and -1 indicating a parsing error.
Outputs:
host = pointer to buffer for IP address (may be NULL), 0 = none
port = pointer to buffer for IP port (may be NULL), 0 = none
result = status (0 on complete success or -1 if
parsing can't happen due to bad syntax, a value is
out of range, a result can't fit into a result buffer,
a service name doesn't exist, or a validation name
doesn't match the parsed host)
*/
int sim_parse_addr (const char *cptr, char *host, size_t host_len, const char *default_host,
char *port, size_t port_len, const char *default_port,
const char *validate_addr)
{
char gbuf[CBUFSIZE], default_pbuf[CBUFSIZE];
const char *hostp;
char *portp;
char *endc;
unsigned long portval;
if ((host != NULL) && (host_len != 0))
memset (host, 0, host_len);
if ((port != NULL) && (port_len != 0))
memset (port, 0, port_len);
if ((cptr == NULL) || (*cptr == 0)) {
if (((default_host == NULL) || (*default_host == 0)) ||
((default_port == NULL) || (*default_port == 0)))
return -1;
if ((host == NULL) || (port == NULL))
return -1; /* no place */
if ((strlen(default_host) >= host_len) || (strlen(default_port) >= port_len))
return -1; /* no room */
strcpy (host, default_host);
strcpy (port, default_port);
return 0;
}
memset (default_pbuf, 0, sizeof(default_pbuf));
if (default_port)
strncpy (default_pbuf, default_port, sizeof(default_pbuf)-1);
gbuf[sizeof(gbuf)-1] = '\0';
strncpy (gbuf, cptr, sizeof(gbuf)-1);
hostp = gbuf; /* default addr */
portp = NULL;
if ((portp = strrchr (gbuf, ':')) && /* x:y? split */
(NULL == strchr (portp, ']'))) {
*portp++ = 0;
if (*portp == '\0')
portp = default_pbuf;
}
else { /* No colon in input */
portp = gbuf; /* Input is the port specifier */
hostp = (const char *)default_host; /* host is defaulted if provided */
}
if ((portp != NULL) && (*portp != '\0')) {
portval = strtoul(portp, &endc, 10);
if ((*endc == '\0') && ((portval == 0) || (portval > 65535)))
return -1; /* numeric value too big */
if (*endc != '\0') {
struct servent *se = getservbyname(portp, "tcp");
if (se == NULL)
return -1; /* invalid service name */
}
}
if (port) /* port wanted? */
if (portp != NULL) {
if (strlen(portp) >= port_len)
return -1; /* no room */
else
strcpy (port, portp);
}
if ((hostp != NULL) && (*hostp != '\0')) {
if (']' == hostp[strlen(hostp)-1]) {
if ('[' != hostp[0])
return -1; /* invalid domain literal */
/* host may be the const default_host so move to temp buffer before modifying */
strncpy(gbuf, hostp+1, sizeof(gbuf)-1); /* remove brackets from domain literal host */
gbuf[strlen(gbuf)-1] = '\0';
hostp = gbuf;
}
}
if (host) { /* host wanted? */
if (hostp != NULL) {
if (strlen(hostp) >= host_len)
return -1; /* no room */
else
if (('\0' != hostp[0]) || (default_host == NULL))
strcpy (host, hostp);
else
if (strlen(default_host) >= host_len)
return -1; /* no room */
else
strcpy (host, default_host);
}
else {
if (default_host) {
if (strlen(default_host) >= host_len)
return -1; /* no room */
else
strcpy (host, default_host);
}
}
}
if (validate_addr) {
struct addrinfo *ai_host, *ai_validate, *ai, *aiv;
int status;
if ((hostp == NULL) ||
(0 != p_getaddrinfo(hostp, NULL, NULL, &ai_host)))
return -1;
if (p_getaddrinfo(validate_addr, NULL, NULL, &ai_validate)) {
p_freeaddrinfo (ai_host);
return -1;
}
status = -1;
for (ai = ai_host; (ai != NULL) && (status == -1); ai = ai->ai_next) {
for (aiv = ai_validate; aiv != NULL; aiv = aiv->ai_next) {
if ((ai->ai_addrlen == aiv->ai_addrlen) &&
(ai->ai_family == aiv->ai_family) &&
(0 == memcmp (ai->ai_addr, aiv->ai_addr, ai->ai_addrlen))) {
status = 0;
break;
}
}
}
if (status != 0) {
/* be generous and allow successful validations against variations of localhost addresses */
if (((0 == strcmp("127.0.0.1", hostp)) &&
(0 == strcmp("::1", validate_addr))) ||
((0 == strcmp("127.0.0.1", validate_addr)) &&
(0 == strcmp("::1", hostp))))
status = 0;
}
p_freeaddrinfo (ai_host);
p_freeaddrinfo (ai_validate);
return status;
}
return 0;
}
/* sim_addr_acl_check host:port,acl
parse a hostname/ipaddress (possibly in CIDR form) and
test against an acl
Inputs:
validate_addr = This address would usually be returned by
sim_accept_conn. The validate_addr can also be a
CIDR address specifier and in that mode, acl should
be NULL so that we're just validating the syntax
of what will likely become an entry in an acl list.
If the validate_addr is provided with cptr as NULL,
the validate_addr is parsed for reasonableness and
the result returned with 0 indicating a reasonable
value and -1 indicating a parsing error.
acl = pointer to acl string which is comprised of comma
separated entries each which may have a + or -
prefix that indicated a permit or deny status when
the entry matches. Each entry may specify a CIDR
form match criteria.
Outputs:
result = status (0 on complete success or -1 if
parsing can't happen due to bad syntax, a value is
out of range or the validate_addr matches a reject
entry in the acl or it is not mentioned at all in
the acl.
*/
int sim_addr_acl_check (const char *validate_addr, const char *acl)
{
int status = -1;
int done = 0;
struct addrinfo *ai_validate;
unsigned long bits = 0;
const char *c;
char *c1, v_cpy[256];
if (validate_addr == NULL)
return status;
c = strchr (validate_addr, '/');
if (c != NULL) {
bits = strtoul (c + 1, &c1, 10);
if ((bits == 0) || (bits > 128) || (*c1 != '\0'))
return status;
if ((c - validate_addr) > sizeof (v_cpy) - 1)
return status;
memcpy (v_cpy, validate_addr, c - validate_addr); /* Copy everything before the / */
v_cpy[c - validate_addr] = '\0'; /* NUL terminate the result */
validate_addr = v_cpy; /* Use the original string minus the prefix specifier */
}
if (p_getaddrinfo(validate_addr, NULL, NULL, &ai_validate))
return status;
if (acl == NULL) { /* Just checking validate_addr syntax? */
status = 0;
if ((ai_validate->ai_family == AF_INET) && (bits > 32))
status = -1;
p_freeaddrinfo (ai_validate);
return status;
}
status = -1;
while ((*acl != '\0') && !done) {
struct addrinfo *ai_rule, *ai, *aiv;
int permit;
unsigned long bits = 0;
const char *cc;
char *c,*c1, rule[260];
permit = (*acl == '+');
cc = strchr (acl, ',');
if (cc != NULL) {
if ((cc - acl) > sizeof (rule))
break; /* Too big - error */
memcpy (rule, acl + 1, cc - (acl + 1));
rule[cc - (acl + 1)] = '\0';
}
else {
if (strlen (acl) >= sizeof (rule))
break; /* Too big - error */
strcpy (rule, acl + 1);
}
acl += strlen (rule) + 1 + (cc != NULL);
c = strchr (rule, '/');
if (c != NULL) {
bits = strtoul (c + 1, &c1, 10);
if ((bits == 0) || (bits > 128) || (*c1 != '\0'))
break;
*c = '\0';
}
if (p_getaddrinfo(rule, NULL, NULL, &ai_rule))
break;
for (ai = ai_rule; (ai != NULL) && (done == 0); ai = ai->ai_next) {
for (aiv = ai_validate; aiv != NULL; aiv = aiv->ai_next) {
if ((ai->ai_addrlen == aiv->ai_addrlen) &&
(ai->ai_family == aiv->ai_family)) {
unsigned int bit, addr_bits;
unsigned char *da, *dav;
if (ai->ai_family == AF_INET) {
da = (unsigned char *)&((struct sockaddr_in *)ai->ai_addr)->sin_addr;
dav = (unsigned char *)&((struct sockaddr_in *)aiv->ai_addr)->sin_addr;
addr_bits = 32;
}
#if !defined(AF_INET6)
else {
done = 1;
break;
}
#else
else {
if (ai->ai_family == AF_INET6) {
da = (unsigned char *)&((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
dav = (unsigned char *)&((struct sockaddr_in6 *)aiv->ai_addr)->sin6_addr;
addr_bits = 128;
}
else {
done = 1;
break;
}
}
#endif
if (bits == 0) /* Bits not specified? */
bits = addr_bits; /* Use them all */
for (bit=0; (bit < bits) && (bit < addr_bits); bit++) {
unsigned int bitmask = 1 << (7 - (bit & 7));
if ((da[bit>>3] & bitmask) != (dav[bit>>3] & bitmask))
break;
}
if (bit == bits) { /* All desired bits matched? */
done = 1;
status = permit ? 0 : -1;
break;
}
}
}
}
p_freeaddrinfo (ai_rule);
}
p_freeaddrinfo (ai_validate);
return status;
}
/* sim_parse_addr_ex localport:host:port
Presumption is that the input, if it doesn't contain a ':' character is a port specifier.
If the host field contains one or more colon characters (i.e. it is an IPv6 address),
the IPv6 address MUST be enclosed in square bracket characters (i.e. Domain Literal format)
llll:w.x.y.z:rrrr
llll:name.domain.com:rrrr
llll::rrrr
rrrr
w.x.y.z:rrrr
[w.x.y.z]:rrrr
name.domain.com:rrrr
Inputs:
cptr = pointer to input string
default_host
= optional pointer to default host if none specified
host_len = length of host buffer
default_port
= optional pointer to default port if none specified
port_len = length of port buffer
Outputs:
host = pointer to buffer for IP address (may be NULL), 0 = none
port = pointer to buffer for IP port (may be NULL), 0 = none
localport
= pointer to buffer for local IP port (may be NULL), 0 = none
result = status (0 on complete success or -1 if
parsing can't happen due to bad syntax, a value is
out of range, a result can't fit into a result buffer,
a service name doesn't exist, or a validation name
doesn't match the parsed host)
*/
int sim_parse_addr_ex (const char *cptr, char *host, size_t hostlen, const char *default_host, char *port, size_t port_len, char *localport, size_t localport_len, const char *default_port)
{
const char *hostp;
if ((localport != NULL) && (localport_len != 0))
memset (localport, 0, localport_len);
hostp = strchr (cptr, ':');
if ((hostp != NULL) && ((hostp[1] == '[') || (NULL != strchr (hostp+1, ':')))) {
if ((localport != NULL) && (localport_len != 0)) {
localport_len -= 1;
if (localport_len > (size_t)(hostp-cptr))
localport_len = (size_t)(hostp-cptr);
memcpy (localport, cptr, localport_len);
}
return sim_parse_addr (hostp+1, host, hostlen, default_host, port, port_len, default_port, NULL);
}
return sim_parse_addr (cptr, host, hostlen, default_host, port, port_len, default_port, NULL);
}
void sim_init_sock (void)
{
#if defined (_WIN32)
int err;
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD (2, 2);
err = WSAStartup (wVersionRequested, &wsaData); /* start Winsock */
if (err != 0)
sim_printf ("Winsock: startup error %d\n", err);
#if defined(AF_INET6)
load_ws2 ();
#endif /* endif AF_INET6 */
#else /* Use native addrinfo APIs */
#if defined(AF_INET6)
p_getaddrinfo = (getaddrinfo_func)getaddrinfo;
p_getnameinfo = (getnameinfo_func)getnameinfo;
p_freeaddrinfo = (freeaddrinfo_func)freeaddrinfo;
#else
/* Native APIs not available, connect stubs */
p_getaddrinfo = (getaddrinfo_func)s_getaddrinfo;
p_getnameinfo = (getnameinfo_func)s_getnameinfo;
p_freeaddrinfo = (freeaddrinfo_func)s_freeaddrinfo;
#endif /* endif AF_INET6 */
#endif /* endif _WIN32 */
#if defined (SIGPIPE)
signal (SIGPIPE, SIG_IGN); /* no pipe signals */
#endif
#if defined(TEST_INFO_STUBS)
/* force use of stubs */
p_getaddrinfo = (getaddrinfo_func)s_getaddrinfo;
p_getnameinfo = (getnameinfo_func)s_getnameinfo;
p_freeaddrinfo = (freeaddrinfo_func)s_freeaddrinfo;
#endif
}
void sim_cleanup_sock (void)
{
#if defined (_WIN32)
WSACleanup ();
#endif
}
#if defined (_WIN32) /* Windows */
static int sim_setnonblock (SOCKET sock)
{
unsigned long non_block = 1;
return ioctlsocket (sock, FIONBIO, &non_block); /* set nonblocking */
}
#elif defined (VMS) /* VMS */
static int sim_setnonblock (SOCKET sock)
{
int non_block = 1;
return ioctl (sock, FIONBIO, &non_block); /* set nonblocking */
}
#else /* Mac, Unix, OS/2 */
static int sim_setnonblock (SOCKET sock)
{
int fl, sta;
fl = fcntl (sock, F_GETFL,0); /* get flags */
if (fl == -1)
return SOCKET_ERROR;
sta = fcntl (sock, F_SETFL, fl | O_NONBLOCK); /* set nonblock */
if (sta == -1)
return SOCKET_ERROR;
#if !defined (macintosh) && !defined (__EMX__) && \
!defined (__HAIKU__) /* Unix only */
sta = fcntl (sock, F_SETOWN, getpid()); /* set ownership */
if (sta == -1)
return SOCKET_ERROR;
#endif
return 0;
}
#endif /* endif !Win32 && !VMS */
static int sim_setnodelay (SOCKET sock)
{
int nodelay = 1;
int sta;
/* disable Nagle algorithm */
sta = setsockopt (sock, IPPROTO_TCP, TCP_NODELAY, (char *)&nodelay, sizeof(nodelay));
if (sta == -1)
return SOCKET_ERROR;
#if defined(TCP_NODELAYACK)
/* disable delayed ack algorithm */
sta = setsockopt (sock, IPPROTO_TCP, TCP_NODELAYACK, (char *)&nodelay, sizeof(nodelay));
if (sta == -1)
return SOCKET_ERROR;
#endif
#if defined(TCP_QUICKACK)
/* disable delayed ack algorithm */
sta = setsockopt (sock, IPPROTO_TCP, TCP_QUICKACK, (char *)&nodelay, sizeof(nodelay));
if (sta == -1)
return SOCKET_ERROR;
#endif
return sta;
}
static SOCKET sim_create_sock (int af, int opt_flags)
{
SOCKET newsock;
int err;
newsock = socket (af, ((opt_flags & SIM_SOCK_OPT_DATAGRAM) ? SOCK_DGRAM : SOCK_STREAM), 0);/* create socket */
if (newsock == INVALID_SOCKET) { /* socket error? */
err = WSAGetLastError ();
#if defined(WSAEAFNOSUPPORT)
if (err == WSAEAFNOSUPPORT) /* expected error, just return */
return newsock;
#endif
return sim_err_sock (newsock, "socket"); /* report error and return */
}
return newsock;
}