/*
* 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.
*
* RCS: @(#) $Id: tclIOSock.c,v 1.11.8.2 2010/03/30 18:52:29 rmax Exp $
*/
#include "tclInt.h"
/*
*---------------------------------------------------------------------------
*
* 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_AppendResult(interp, "couldn't open socket: port number too high",
NULL);
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.
*
*----------------------------------------------------------------------
*/
int
TclSockMinimumBuffers(
int sock, /* Socket file descriptor */
int size) /* Minimum buffer size */
{
int current;
socklen_t len;
len = sizeof(int);
getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)¤t, &len);
if (current < size) {
len = sizeof(int);
setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char *)&size, len);
}
len = sizeof(int);
getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)¤t, &len);
if (current < size) {
len = sizeof(int);
setsockopt(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(
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, portstring[TCL_INTEGER_SPACE];
Tcl_DString ds;
int result, i;
TclFormatInt(portstring, port);
if (host != NULL) {
native = Tcl_UtfToExternalDString(NULL, host, -1, &ds);
}
(void) memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
#ifdef AI_ADDRCONFIG
/* Missing on: OpenBSD, NetBSD */
hints.ai_flags |= AI_ADDRCONFIG;
#endif
if (willBind) {
hints.ai_flags |= AI_PASSIVE;
}
result = getaddrinfo(native, portstring, &hints, addrlist);
if (host != NULL) {
Tcl_DStringFree(&ds);
}
if (result != 0) {
goto error;
}
/*
* 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;
/*
* Ought to use gai_strerror() here...
*/
error:
switch (result) {
case EAI_NONAME:
case EAI_SERVICE:
#if defined(EAI_ADDRFAMILY) && EAI_ADDRFAMILY != EAI_NONAME
case EAI_ADDRFAMILY:
#endif
#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME
case EAI_NODATA:
#endif
*errorMsgPtr = gai_strerror(result);
errno = EHOSTUNREACH;
return 0;
#ifdef EAI_SYSTEM
case EAI_SYSTEM:
return 0;
#endif
default:
*errorMsgPtr = gai_strerror(result);
errno = ENXIO;
return 0;
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/