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/*
* For license terms, see the file COPYING in this directory.
*/
/***********************************************************************
module: socket.c
project: fetchmail
programmer: Carl Harris, ceharris@mal.com
description: socket library functions
***********************************************************************/
#include <config.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#if defined(STDC_HEADERS)
#include <string.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 <stdlib.h>
#include <errno.h>
#include "socket.h"
/* 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 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 -1;
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 sock;
if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
return -1;
return sock;
}
int SockGets(socket,buf,len)
int socket;
char *buf;
int len;
{
int rdlen = 0;
RETSIGTYPE (*sigsave)();
while (--len)
{
if (SockInternalRead(socket, buf, 1) != 1)
return -1;
else
rdlen++;
if (*buf == '\n')
break;
if (*buf != '\r') /* remove all CRs */
buf++;
}
*buf = 0;
return rdlen;
}
int SockPuts(socket,buf)
int socket;
char *buf;
{
int rc;
if (rc = SockWrite(socket, buf, strlen(buf)))
return rc;
return SockWrite(socket, "\r\n", 2);
}
int SockWrite(socket,buf,len)
int socket;
char *buf;
int len;
{
int n;
while (len)
{
n = write(socket, buf, len);
if (n <= 0)
return -1;
len -= n;
buf += n;
}
return 0;
}
int SockRead(socket,buf,len)
int socket;
char *buf;
int len;
{
int n;
while (len)
{
n = SockInternalRead(socket, buf, len);
if (n <= 0)
return -1;
len -= n;
buf += n;
}
return 0;
}
static int sbuflen = 0;
int SockInternalRead (socket,buf,len)
int socket;
char *buf;
int len;
{
static char sbuf [INTERNAL_BUFSIZE];
static char *bp;
if (sbuflen == 0) {
/* buffer is empty; refresh. */
if ((sbuflen = read(socket,sbuf,INTERNAL_BUFSIZE)) < 0) {
if (errno = EINTR)
return -1;
perror("SockInternalRead: read");
exit(9);
}
else
bp = sbuf;
}
else
; /* already some data in the buffer */
/* can't get more than we have right now. */
/* XXX -- should probably try to load any unused part of sbuf
so that as much of 'len' as possible can be satisfied */
if (len > sbuflen)
len = sbuflen;
else
; /* wants no more than we already have */
/* transfer to caller's buffer */
if (len == 1) {
/* special case: if caller only wants one character, it probably
costs a lot more to call bcopy than to do it ourselves. */
*buf = *(bp++);
sbuflen--;
}
else {
bcopy(bp,buf,len);
sbuflen -= len;
bp += len;
}
return(len);
}
/* SockClearHeader: call this procedure in order to kill off any
forthcoming Header info from the socket that we no longer want.
*/
int SockClearHeader(socket)
int socket;
{
char *bufp;
static char sbuf[INTERNAL_BUFSIZE];
int nBytes;
int res;
if ((res = SockDataWaiting(socket)) <= 0)
return res;
while (1)
{
if (SockGets(socket,sbuf,INTERNAL_BUFSIZE) < 0)
return 0;
bufp = sbuf;
if (*bufp == '.') {
bufp++;
if (*bufp == 0)
break;
}
}
sbuflen = 0;
return 0;
}
/* SockDataWaiting: Return a non-zero value if this socket is waiting
for data. */
int SockDataWaiting(int socket)
{
int flags;
char sbuf[INTERNAL_BUFSIZE];
int n;
int res;
flags = fcntl(socket,F_GETFL,0);
/* set it to non-block */
if (fcntl(socket,F_SETFL,flags | O_NONBLOCK) == -1)
return -1;
if ((n = recv(socket,sbuf,INTERNAL_BUFSIZE,MSG_PEEK)) == -1)
{
/* No data to read. */
if (errno == EWOULDBLOCK)
res = 0;
}
else
res = n;
/* reset it to block (or, whatever it was). */
fcntl(socket,F_SETFL,flags);
return res;
}
#if defined(HAVE_STDARG_H)
int SockPrintf(int socket, char* format, ...)
{
#else
int SockPrintf(socket,format,va_alist)
int socket;
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(socket, buf, strlen(buf));
}
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