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/* $OpenBSD: net.c,v 1.15 2023/02/08 08:24:29 tb Exp $ */
/*
* 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. 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.
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <err.h>
#include "finger.h"
#include "extern.h"
void
netfinger(char *name)
{
FILE *fp;
int c, lastc;
int s;
char *host;
struct addrinfo hints, *res0, *res;
int error;
char hbuf[NI_MAXHOST];
lastc = 0;
if (!(host = strrchr(name, '@')))
return;
*host++ = '\0';
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, "finger", &hints, &res0);
if (error) {
warnx("%s", gai_strerror(error));
return;
}
s = -1;
for (res = res0; res; res = res->ai_next) {
if ((s = socket(res->ai_family, res->ai_socktype,
res->ai_protocol)) == -1) {
continue;
}
if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
(void)close(s);
s = -1;
continue;
}
break;
}
if (s == -1) {
perror("finger");
freeaddrinfo(res0);
return;
}
/* have network connection; identify the host connected with */
if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
NULL, 0, NI_NUMERICHOST) != 0) {
strlcpy(hbuf, "(invalid)", sizeof hbuf);
}
(void)printf("[%s/%s]\n", host, hbuf);
freeaddrinfo(res0);
/* -l flag for remote fingerd */
if (lflag)
write(s, "/W ", 3);
/* send the name followed by <CR><LF> */
(void)write(s, name, strlen(name));
(void)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.
*
* 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.
*/
if ((fp = fdopen(s, "r")) != NULL)
while ((c = getc(fp)) != EOF) {
c &= 0x7f;
if (c == '\r') {
if (lastc == '\r')
continue;
c = '\n';
lastc = '\r';
} else {
if (!isprint(c) && !isspace(c))
c |= 0x40;
if (lastc != '\r' || c != '\n')
lastc = c;
else {
lastc = '\n';
continue;
}
}
putchar(c);
}
if (lastc != '\n')
putchar('\n');
(void)fclose(fp);
}
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