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/* ==== net.c ============================================================
* Copyright (c) 1993, 1995 by Chris Provenzano, proven@athena.mit.edu
*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
*
* 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.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* 1.00 93/08/26 proven
* -Pthread redesign of this file.
*/
#include <pthreadutil.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
/*
* These globals are set initialy and then are only read.
* They do not need mutexes.
*/
extern int lflag;
char myhostname[MAXHOSTNAMELEN];
/*
* These globals change and therefor do need mutexes
*/
pthread_mutex_t spmutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t spcond = PTHREAD_COND_INITIALIZER;
struct servent *sp = NULL;
void netsetup(void)
{
pthread_mutex_lock(&spmutex);
if (sp) {
fprintf(stderr, "finger: service pointer already initialized.\n");
exit(2);
}
if ((sp = (struct servent *)malloc(sizeof(struct servent) + 4096)) == NULL){
fprintf(stderr, "finger: Couldn't allocate service pointer.\n");
exit(2);
}
if (getservbyname_r("finger", "tcp", sp, (char *)sp + sizeof(struct servent), 4096) == NULL) {
fprintf(stderr, "finger: tcp/finger: unknown service\n");
exit(2);
}
if (gethostname(myhostname, MAXHOSTNAMELEN)) {
fprintf(stderr, "finger: couldn't get my hostname.\n");
exit(2);
}
pthread_cond_broadcast(&spcond);
pthread_mutex_unlock(&spmutex);
}
void netsetupwait(void)
{
pthread_mutex_lock(&spmutex);
while(sp == NULL) {
pthread_cond_wait(&spcond, &spmutex);
}
pthread_mutex_unlock(&spmutex);
}
void *netfinger(char *name)
{
pthread_atexit_t atexit_id;
register int c, lastc;
struct in_addr defaddr;
struct hostent *hp;
struct sockaddr_in sin;
int s, i, readbuflen;
char readbuf[1024];
char *host;
netsetupwait();
pthread_atexit_add(&atexit_id, fflush_nrv, NULL);
if (!(host = strrchr(name, '@'))) {
host = myhostname;
} else {
*host++ = '\0';
}
if (!(hp = gethostbyname(host))) {
if ((defaddr.s_addr = inet_addr(host)) < 0) {
fprintf(stderr, "[%s] gethostbyname: Unknown host\n", host);
return;
}
}
sin.sin_family = hp->h_addrtype;
memcpy((char *)&sin.sin_addr, hp->h_addr, hp->h_length);
sin.sin_port = sp->s_port;
if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) {
sprintf(readbuf, "[%s]: socket", hp->h_name);
perror(readbuf);
return;
}
/* have network connection; identify the host connected with */
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
sprintf(readbuf, "[%s]: connect", hp->h_name);
perror(readbuf);
close(s);
return;
}
/* -l flag for remote fingerd */
if (lflag)
write(s, "/W ", 3);
/* send the name followed by <CR><LF> */
write(s, name, strlen(name));
write(s, "\r\n", 2);
/*
* Read from the remote system; once we're connected, we assume some
* data. If none arrives, we hang until the user interrupts, or
* until the thread timeout expires.
*
* If we see a <CR> or a <CR> with the high bit set, treat it as
* a newline; if followed by a newline character, only output one
* newline.
*
* Otherwise, all high bits are stripped; if it isn't printable and
* it isn't a space, we can simply set the 7th bit. Every ASCII
* character with bit 7 set is printable.
*/
for (readbuflen = read(s, readbuf, 1024), flockfile(stdout), lastc = '\n',
printf("[%s]\n", hp->h_name); readbuflen > 0;
readbuflen = read(s, readbuf, 1024)) {
for (i = 0; i < readbuflen; i++) {
c = readbuf[i] & 0x7f;
if (c == 0x0d) {
c = '\n';
lastc = '\r';
} else {
if (!isprint(c) && !isspace(c))
c |= 0x40;
if (lastc != '\r' || c != '\n')
lastc = c;
else {
lastc = '\n';
continue;
}
}
putchar_unlocked(c);
}
}
if (lastc != '\n')
putchar_unlocked('\n');
funlockfile(stdout);
}
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