/*
* tclIOSock.c --
*
* Common routines used by all socket based channel types.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#if defined(_WIN32) && defined(UNICODE)
/* On Windows, we always need the ASCII version. */
# undef gai_strerror
# define gai_strerror gai_strerrorA
#endif
/*
*---------------------------------------------------------------------------
*
* TclSockGetPort --
*
* Maps from a string, which could be a service name, to a port. Used by
* socket creation code to get port numbers and resolve registered
* service names to port numbers.
*
* Results:
* A standard Tcl result. On success, the port number is returned in
* portPtr. On failure, an error message is left in the interp's result.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
TclSockGetPort(
Tcl_Interp *interp,
const char *string, /* Integer or service name */
const char *proto, /* "tcp" or "udp", typically */
int *portPtr) /* Return port number */
{
struct servent *sp; /* Protocol info for named services */
Tcl_DString ds;
const char *native;
if (Tcl_GetInt(NULL, string, portPtr) != TCL_OK) {
/*
* Don't bother translating 'proto' to native.
*/
native = Tcl_UtfToExternalDString(NULL, string, -1, &ds);
sp = getservbyname(native, proto); /* INTL: Native. */
Tcl_DStringFree(&ds);
if (sp != NULL) {
*portPtr = ntohs((unsigned short) sp->s_port);
return TCL_OK;
}
}
if (Tcl_GetInt(interp, string, portPtr) != TCL_OK) {
return TCL_ERROR;
}
if (*portPtr > 0xFFFF) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"couldn't open socket: port number too high", -1));
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclSockMinimumBuffers --
*
* Ensure minimum buffer sizes (non zero).
*
* Results:
* A standard Tcl result.
*
* Side effects:
* Sets SO_SNDBUF and SO_RCVBUF sizes.
*
*----------------------------------------------------------------------
*/
#if !defined(_WIN32) && !defined(__CYGWIN__)
# define SOCKET int
#endif
int
TclSockMinimumBuffers(
void *sock, /* Socket file descriptor */
int size) /* Minimum buffer size */
{
int current;
socklen_t len;
len = sizeof(int);
getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
(char *) ¤t, &len);
if (current < size) {
len = sizeof(int);
setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_SNDBUF,
(char *) &size, len);
}
len = sizeof(int);
getsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
(char *) ¤t, &len);
if (current < size) {
len = sizeof(int);
setsockopt((SOCKET)(size_t) sock, SOL_SOCKET, SO_RCVBUF,
(char *) &size, len);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclCreateSocketAddress --
*
* This function initializes a sockaddr structure for a host and port.
*
* Results:
* 1 if the host was valid, 0 if the host could not be converted to an IP
* address.
*
* Side effects:
* Fills in the *sockaddrPtr structure.
*
*----------------------------------------------------------------------
*/
int
TclCreateSocketAddress(
Tcl_Interp *interp, /* Interpreter for querying
* the desired socket family */
struct addrinfo **addrlist, /* Socket address list */
const char *host, /* Host. NULL implies INADDR_ANY */
int port, /* Port number */
int willBind, /* Is this an address to bind() to or
* to connect() to? */
const char **errorMsgPtr) /* Place to store the error message
* detail, if available. */
{
struct addrinfo hints;
struct addrinfo *p;
struct addrinfo *v4head = NULL, *v4ptr = NULL;
struct addrinfo *v6head = NULL, *v6ptr = NULL;
char *native = NULL, portbuf[TCL_INTEGER_SPACE], *portstring;
const char *family = NULL;
Tcl_DString ds;
int result, i;
if (host != NULL) {
native = Tcl_UtfToExternalDString(NULL, host, -1, &ds);
}
/*
* Workaround for OSX's apparent inability to resolve "localhost", "0"
* when the loopback device is the only available network interface.
*/
if (host != NULL && port == 0) {
portstring = NULL;
} else {
TclFormatInt(portbuf, port);
portstring = portbuf;
}
(void) memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
/*
* Magic variable to enforce a certain address family - to be superseded
* by a TIP that adds explicit switches to [socket]
*/
if (interp != NULL) {
family = Tcl_GetVar(interp, "::tcl::unsupported::socketAF", 0);
if (family != NULL) {
if (strcmp(family, "inet") == 0) {
hints.ai_family = AF_INET;
} else if (strcmp(family, "inet6") == 0) {
hints.ai_family = AF_INET6;
}
}
}
hints.ai_socktype = SOCK_STREAM;
#if 0
/*
* We found some problems when using AI_ADDRCONFIG, e.g. on systems that
* have no networking besides the loopback interface and want to resolve
* localhost. See [Bugs 3385024, 3382419, 3382431]. As the advantage of
* using AI_ADDRCONFIG in situations where it works, is probably low,
* we'll leave it out for now. After all, it is just an optimisation.
*
* Missing on: OpenBSD, NetBSD.
* Causes failure when used on AIX 5.1 and HP-UX
*/
#if defined(AI_ADDRCONFIG) && !defined(_AIX) && !defined(__hpux)
hints.ai_flags |= AI_ADDRCONFIG;
#endif /* AI_ADDRCONFIG && !_AIX && !__hpux */
#endif /* 0 */
if (willBind) {
hints.ai_flags |= AI_PASSIVE;
}
result = getaddrinfo(native, portstring, &hints, addrlist);
if (host != NULL) {
Tcl_DStringFree(&ds);
}
if (result != 0) {
*errorMsgPtr =
#ifdef EAI_SYSTEM /* Doesn't exist on Windows */
(result == EAI_SYSTEM) ? Tcl_PosixError(interp) :
#endif /* EAI_SYSTEM */
gai_strerror(result);
return 0;
}
/*
* Put IPv4 addresses before IPv6 addresses to maximize backwards
* compatibility of [fconfigure -sockname] output.
*
* There might be more elegant/efficient ways to do this.
*/
if (willBind) {
for (p = *addrlist; p != NULL; p = p->ai_next) {
if (p->ai_family == AF_INET) {
if (v4head == NULL) {
v4head = p;
} else {
v4ptr->ai_next = p;
}
v4ptr = p;
} else {
if (v6head == NULL) {
v6head = p;
} else {
v6ptr->ai_next = p;
}
v6ptr = p;
}
}
*addrlist = NULL;
if (v6head != NULL) {
*addrlist = v6head;
v6ptr->ai_next = NULL;
}
if (v4head != NULL) {
v4ptr->ai_next = *addrlist;
*addrlist = v4head;
}
}
i = 0;
for (p = *addrlist; p != NULL; p = p->ai_next) {
i++;
}
return 1;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/