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/*
* socket.c -- socket library functions
*
* For license terms, see the file COPYING in this directory.
*/
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#if defined(HAVE_STDARG_H)
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "socket.h"
FILE *Socket(host, clientPort)
char *host;
int clientPort;
{
int sock;
unsigned long inaddr;
struct sockaddr_in ad;
struct hostent *hp;
memset(&ad, 0, sizeof(ad));
ad.sin_family = AF_INET;
inaddr = inet_addr(host);
if (inaddr != INADDR_NONE)
memcpy(&ad.sin_addr, &inaddr, sizeof(inaddr));
else
{
hp = gethostbyname(host);
if (hp == NULL)
return (FILE *)NULL;
memcpy(&ad.sin_addr, hp->h_addr, hp->h_length);
}
ad.sin_port = htons(clientPort);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
return (FILE *)NULL;
/* under 2.0.23, connect(2) doesn't return -1 on ENETUNREACH failure */
errno = 0;
connect(sock, (struct sockaddr *) &ad, sizeof(ad));
if (errno != 0)
{
close(sock);
return (FILE *)NULL;
}
return fdopen(sock, "r+");
}
#if defined(HAVE_STDARG_H)
int SockPrintf(FILE *sockfp, char* format, ...)
{
#else
int SockPrintf(sockfp,format,va_alist)
FILE *sockfp;
char *format;
va_dcl {
#endif
va_list ap;
char buf[8192];
#if defined(HAVE_STDARG_H)
va_start(ap, format) ;
#else
va_start(ap);
#endif
vsprintf(buf, format, ap);
va_end(ap);
return SockWrite(buf, strlen(buf), sockfp);
}
/*
* FIXME: This needs to be recoded to use stdio, if that's possible.
*
* If you think these functions are too slow and inefficient, you're
* absolutely right. I wish I could figure out what to do about it.
* The ancestral popclient used static buffering here to cut down on the
* number of read(2) calls, but we can't do that because we can have
* two or more sockets open at a time.
*
* The right thing to do would be to use stdio for internal per-socket
* buffering here (which is why Socket() returns a file pointer) but
* this causes mysterious lossage. In case someone ever finds a way
* around this, a note on Carl Harris's original implementation said:
*
* Size of buffer for internal buffering read function
* don't increase beyond the maximum atomic read/write size for
* your sockets, or you'll take a potentially huge performance hit
*
* #define INTERNAL_BUFSIZE 2048
*
*/
int SockWrite(buf,len,sockfp)
char *buf;
int len;
FILE *sockfp;
{
int n, wrlen = 0;
while (len)
{
n = write(fileno(sockfp), buf, len);
if (n <= 0)
return -1;
len -= n;
wrlen += n;
buf += n;
}
return wrlen;
}
int SockGets(buf, len, sockfp)
char *buf;
int len;
FILE *sockfp;
{
int rdlen = 0;
while (--len)
{
if (read(fileno(sockfp), buf, 1) != 1)
return -1;
else
rdlen++;
if (*buf == '\n')
break;
if (*buf != '\r') /* remove all CRs */
buf++;
}
*buf = 0;
return rdlen;
}
/* socket.c ends here */
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