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![Warner Losh](/assets/img/avatar_default.png)
We've ifdef'd out the copyright strings for some time now. Go ahead and remove the ifdefs. Plus whatever other detritis was left over from other recent removals. These copyright strings are present in the comments and are largely from CSRG's attempt at adding their copyright to every binary file (which modern interpretations of the license doesn't require). Sponsored by: Netflix
232 lines
5.6 KiB
C
232 lines
5.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pathnames.h"
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#ifdef USE_BLACKLIST
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#include <blacklist.h>
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#endif
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void logerr(const char *, ...) __printflike(1, 2) __dead2;
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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int ch;
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char *lp;
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struct sockaddr_storage ss;
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socklen_t sval;
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int p[2], debug, kflag, logging, pflag, secure;
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#define ENTRIES 50
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char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
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char rhost[MAXHOSTNAMELEN];
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prog = _PATH_FINGER;
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debug = logging = kflag = pflag = secure = 0;
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openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
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opterr = 0;
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while ((ch = getopt(argc, argv, "dklp:s")) != -1)
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switch (ch) {
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case 'd':
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debug = 1;
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break;
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case 'k':
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kflag = 1;
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break;
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case 'l':
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logging = 1;
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break;
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case 'p':
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prog = optarg;
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pflag = 1;
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break;
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case 's':
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secure = 1;
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break;
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case '?':
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default:
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logerr("illegal option -- %c", optopt);
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}
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/*
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* Enable server-side Transaction TCP.
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*/
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if (!debug) {
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int one = 1;
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if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one,
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sizeof one) < 0) {
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logerr("setsockopt(TCP_NOPUSH) failed: %m");
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}
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}
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if (!fgets(line, sizeof(line), stdin))
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exit(1);
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if (!debug && (logging || pflag)) {
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sval = sizeof(ss);
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if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0)
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logerr("getpeername: %s", strerror(errno));
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realhostname_sa(rhost, sizeof rhost - 1,
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(struct sockaddr *)&ss, sval);
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rhost[sizeof(rhost) - 1] = '\0';
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if (pflag)
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setenv("FINGERD_REMOTE_HOST", rhost, 1);
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}
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if (logging) {
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char *t;
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char *end;
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end = memchr(line, 0, sizeof(line));
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if (end == NULL) {
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if ((t = malloc(sizeof(line) + 1)) == NULL)
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logerr("malloc: %s", strerror(errno));
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memcpy(t, line, sizeof(line));
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t[sizeof(line)] = 0;
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} else {
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if ((t = strdup(line)) == NULL)
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logerr("strdup: %s", strerror(errno));
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}
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for (end = t; *end; end++)
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if (*end == '\n' || *end == '\r')
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*end = ' ';
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syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t);
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}
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comp = &av[2];
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av[3] = "--";
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if (kflag)
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*comp-- = "-k";
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for (lp = line, ap = &av[4];;) {
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*ap = strtok(lp, " \t\r\n");
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if (!*ap) {
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if (secure && ap == &av[4]) {
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#ifdef USE_BLACKLIST
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blacklist(1, STDIN_FILENO, "nousername");
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#endif
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puts("must provide username\r\n");
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exit(1);
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}
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break;
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}
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if (secure && strchr(*ap, '@')) {
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#ifdef USE_BLACKLIST
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blacklist(1, STDIN_FILENO, "noforwarding");
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#endif
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puts("forwarding service denied\r\n");
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exit(1);
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}
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/* RFC742: "/[Ww]" == "-l" */
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if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
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*comp-- = "-l";
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}
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else if (++ap == av + ENTRIES) {
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*ap = NULL;
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break;
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}
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lp = NULL;
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}
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if ((lp = strrchr(prog, '/')) != NULL)
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*comp = ++lp;
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else
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*comp = prog;
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if (pipe(p) < 0)
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logerr("pipe: %s", strerror(errno));
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if (debug) {
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fprintf(stderr, "%s", prog);
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for (ap = comp; *ap != NULL; ++ap)
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fprintf(stderr, " %s", *ap);
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fprintf(stderr, "\n");
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}
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switch(vfork()) {
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case 0:
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(void)close(p[0]);
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if (p[1] != STDOUT_FILENO) {
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(void)dup2(p[1], STDOUT_FILENO);
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(void)close(p[1]);
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}
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dup2(STDOUT_FILENO, STDERR_FILENO);
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#ifdef USE_BLACKLIST
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blacklist(0, STDIN_FILENO, "success");
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#endif
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execv(prog, comp);
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write(STDERR_FILENO, prog, strlen(prog));
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#define MSG ": cannot execute\n"
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write(STDERR_FILENO, MSG, strlen(MSG));
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#undef MSG
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_exit(1);
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case -1:
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logerr("fork: %s", strerror(errno));
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}
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(void)close(p[1]);
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if (!(fp = fdopen(p[0], "r")))
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logerr("fdopen: %s", strerror(errno));
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while ((ch = getc(fp)) != EOF) {
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if (ch == '\n')
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putchar('\r');
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putchar(ch);
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}
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exit(0);
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}
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#include <stdarg.h>
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void
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logerr(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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(void)vsyslog(LOG_ERR, fmt, ap);
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va_end(ap);
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exit(1);
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/* NOTREACHED */
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}
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