diff options
Diffstat (limited to 'finger/net.c')
| -rw-r--r-- | finger/net.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/finger/net.c b/finger/net.c new file mode 100644 index 0000000..d6169fa --- /dev/null +++ b/finger/net.c @@ -0,0 +1,155 @@ +/* + * 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. + */ + +#ifndef lint +/*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/ +char net_rcsid[] = "$Id: net.c,v 1.9 1999/09/14 10:51:11 dholland Exp $"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> +#include <ctype.h> +#include "finger.h" + +void netfinger(const char *name) { + register FILE *fp; + struct in_addr defaddr; + register int c, sawret, ateol; + struct hostent *hp, def; + struct servent *sp; + struct sockaddr_in sn; + int s; + char *alist[1], *host; + + host = strrchr(name, '@'); + if (!host) return; + *host++ = '\0'; + + memset(&sn, 0, sizeof(sn)); + + sp = getservbyname("finger", "tcp"); + if (!sp) { + eprintf("finger: tcp/finger: unknown service\n"); + return; + } + sn.sin_port = sp->s_port; + + hp = gethostbyname(host); + if (!hp) { + if (!inet_aton(host, &defaddr)) { + eprintf("finger: unknown host: %s\n", host); + return; + } + def.h_name = host; + def.h_addr_list = alist; + def.h_addr = (char *)&defaddr; + def.h_length = sizeof(struct in_addr); + def.h_addrtype = AF_INET; + def.h_aliases = 0; + hp = &def; + } + sn.sin_family = hp->h_addrtype; + if (hp->h_length > (int)sizeof(sn.sin_addr)) { + hp->h_length = sizeof(sn.sin_addr); + } + memcpy(&sn.sin_addr, hp->h_addr, hp->h_length); + + if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { + eprintf("finger: socket: %s\n", strerror(errno)); + return; + } + + /* print hostname before connecting, in case it takes a while */ + xprintf("[%s]\n", hp->h_name); + if (connect(s, (struct sockaddr *)&sn, sizeof(sn)) < 0) { + eprintf("finger: connect: %s\n", strerror(errno)); + 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. + * + * 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. + * + * Text is sent to xputc() for printability analysis. + */ + fp = fdopen(s, "r"); + if (!fp) { + eprintf("finger: fdopen: %s\n", strerror(errno)); + close(s); + return; + } + + sawret = 0; + ateol = 1; + while ((c = getc(fp)) != EOF) { + c &= 0xff; + if (c == ('\r'|0x80) || c == ('\n'|0x80)) c &= 0x7f; + if (c == '\r') { + sawret = ateol = 1; + xputc('\n'); + } + else if (sawret && c == '\n') { + sawret = 0; + /* don't print */ + } + else { + if (c == '\n') ateol = 1; + sawret = 0; + xputc(c); + } + } + if (!ateol) xputc('\n'); + fclose(fp); +} |