common.c

Sigma SMP8634 Mrua v. 2.8.2.0

/*-
 * Copyright (c) 1998-2004 Dag-Erling Co飀an Sm鴕grav
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#define ALLOW_OS_CODE 1
#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <netinet/in.h>

#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "../include/rmlibhttp.h"
#include "common.h"

/*** Local data **************************************************************/

/*
 * Error messages for resolver errors
 */
static struct fetcherr _netdb_errlist[] = {
#ifdef EAI_NODATA
	{ EAI_NODATA,	FETCH_RESOLV,	"Host not found" },
#endif
	{ EAI_AGAIN,	FETCH_TEMP,	"Transient resolver failure" },
	{ EAI_FAIL,	FETCH_RESOLV,	"Non-recoverable resolver failure" },
	{ EAI_NONAME,	FETCH_RESOLV,	"No address record" },
	{ -1,		FETCH_UNKNOWN,	"Unknown resolver error" }
};

/* End-of-Line */
static const RMascii ENDL[3] = "\r\n";


/*** Error-reporting functions ***********************************************/

/*
 * Map error code to string
 */
static struct fetcherr *
_fetch_finderr(struct fetcherr *p, RMint32 e)
{
	while (p->num != -1 && p->num != e)
		p++;
	return (p);
}

/*
 * Set error code
 */
void
_fetch_seterr(struct fetcherr *p, RMint32 e)
{
	p = _fetch_finderr(p, e);
	fetchLastErrCode = p->cat;
	snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
}

/*
 * Set error code according to errno
 */
void
_fetch_syserr(void)
{
	switch (errno) {
	case 0:
		fetchLastErrCode = FETCH_OK;
		break;
	case EPERM:
	case EACCES:
	case EROFS:
		fetchLastErrCode = FETCH_AUTH;
		break;
	case ENOENT:
	case EISDIR: /* XXX */
		fetchLastErrCode = FETCH_UNAVAIL;
		break;
	case ENOMEM:
		fetchLastErrCode = FETCH_MEMORY;
		break;
	case EBUSY:
	case EAGAIN:
		fetchLastErrCode = FETCH_TEMP;
		break;
	case EEXIST:
		fetchLastErrCode = FETCH_EXISTS;
		break;
	case ENOSPC:
		fetchLastErrCode = FETCH_FULL;
		break;
	case EADDRINUSE:
	case EADDRNOTAVAIL:
	case ENETDOWN:
	case ENETUNREACH:
	case ENETRESET:
	case EHOSTUNREACH:
		fetchLastErrCode = FETCH_NETWORK;
		break;
	case ECONNABORTED:
	case ECONNRESET:
		fetchLastErrCode = FETCH_ABORT;
		break;
	case ETIMEDOUT:
		fetchLastErrCode = FETCH_TIMEOUT;
		break;
	case EPIPE:
		fetchLastErrCode = FETCH_PIPE;
		break;
	case ECONNREFUSED:
	case EHOSTDOWN:
		fetchLastErrCode = FETCH_DOWN;
		break;
default:
		fetchLastErrCode = FETCH_UNKNOWN;
	}
	snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
}


/*
 * Emit status message
 */
void
_fetch_info(const RMascii *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fputc('\n', stderr);
}


/*** Network-related utility functions ***************************************/

/*
 * Return the default port for a scheme
 */
RMint32
_fetch_default_port(const RMascii *scheme)
{
	return (HTTP_DEFAULT_PORT);
}

/*
 * Return the default proxy port for a scheme
 */
RMint32
_fetch_default_proxy_port(const RMascii *scheme)
{
	return (HTTP_DEFAULT_PROXY_PORT);
}


/*
 * Create a connection for an existing descriptor.
 */
conn_t *
_fetch_reopen(RMint32 sd)
{
	conn_t *conn;

	/* allocate and fill connection structure */
	if ((conn = RMCalloc(1, sizeof(*conn))) == NULL)
		return (NULL);
	conn->sd = sd;
	++conn->ref;
	return (conn);
}


/*
 * Bump a connection's reference count.
 */
conn_t *
_fetch_ref(conn_t *conn)
{

	++conn->ref;
	return (conn);
}


/*
 * Bind a socket to a specific local address
 */
RMint32
_fetch_bind(RMint32 sd, RMint32 af, const RMascii *addr)
{
	struct addrinfo hints, *res, *res0;
	RMint32 err;

	RMMemset(&hints, 0, sizeof(hints));
	hints.ai_family = af;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = 0;
	if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0)
		return (-1);
	for (res = res0; res; res = res->ai_next)
		if (bind(sd, res->ai_addr, res->ai_addrlen) == 0)
			return (0);
	return (-1);
}


/*
 * Establish a TCP connection to the specified port on the specified host.
 */
conn_t *
_fetch_connect(const RMascii *host, RMint32 port, RMint32 af, RMint32 verbose)
{
	conn_t *conn;
	RMascii pbuf[10];
	const RMascii *bindaddr;
	struct addrinfo hints, *res, *res0;
	RMint32 sd, err, r;
	long fcntl_arg=0;

	RMDBGLOG((HTTPDEBUG, "---> %s:%ld\n", host, port));

	if (verbose)
		_fetch_info("looking up %s", host);

	/* look up host name and set up socket address structure */
	snprintf(pbuf, sizeof(pbuf), "%ld", port);
	RMMemset(&hints, 0, sizeof(hints));
	hints.ai_family = af;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = 0;
	if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) {
		_netdb_seterr(err);
		return (NULL);
	}
	bindaddr = getenv("FETCH_BIND_ADDRESS");

	if (verbose)
		_fetch_info("connecting to %s:%d", host, port);

	/* try to connect */
	for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) {
		if ((sd = socket(res->ai_family, res->ai_socktype,
                        res->ai_protocol)) == -1)
			continue;
		if (bindaddr != NULL && *bindaddr != '\0' &&
		    _fetch_bind(sd, res->ai_family, bindaddr) != 0) {
			_fetch_info("failed to bind to '%s'", bindaddr);
			close(sd);
			continue;
		}

		/* make the socket non blocking */
		if (fetchTimeout) {
			fcntl_arg = fcntl(sd, F_GETFL);
			fcntl(sd, F_SETFL, fcntl_arg|O_NONBLOCK);
		}

		if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
			break;
		else if (fetchTimeout && (errno == EINPROGRESS)) {
			fd_set writefds;
			struct timeval now, timeout, wait;
			
			FD_ZERO(&writefds);
			gettimeofday(&timeout, NULL);
			/* give more timeout connect than for read/write */
			timeout.tv_sec += 2*fetchTimeout;
			
			while (!FD_ISSET(sd, &writefds)) {
				gettimeofday(&now, NULL);
				wait.tv_sec = timeout.tv_sec - now.tv_sec;
				wait.tv_usec = timeout.tv_usec - now.tv_usec;
				if (wait.tv_usec < 0) {
					wait.tv_usec += 1000000;
					wait.tv_sec--;
				}
				if (wait.tv_sec < 0) {
					errno = ETIMEDOUT;
					_fetch_syserr();
					break;
				}
				errno = 0;
				FD_SET(sd, &writefds);
				r = select(sd + 1, NULL, &writefds, NULL, &wait);
				if (r == -1) {
					if (errno == EINTR && fetchRestartCalls)
						continue;
					_fetch_syserr();
					break;
				}
			}
			
			if (FD_ISSET(sd, &writefds)) {
				break;
			}
		}
		close(sd);
	}

	/* restore the blocking flag */
	if (fetchTimeout) 
		fcntl(sd, F_SETFL, fcntl_arg&~O_NONBLOCK);

	freeaddrinfo(res0);
	if (sd == -1) {
		_fetch_syserr();
		return (NULL);
	}