/usr.bin/finger/finger.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 405 lines · 280 code · 38 blank · 87 comment · 112 complexity · 8cac2286bae80268469763404a141a14 MD5 · raw file
- /*
- * Copyright (c) 1989, 1993
- * 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.
- * 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.
- */
- /*
- * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
- * - mail status ("No Mail", "Mail read:...", or "New Mail ...,
- * Unread since ...".)
- * - 4 digit phone extensions (3210 is printed as x3210.)
- * - host/office toggling in short format with -h & -o.
- * - short day names (`Tue' printed instead of `Jun 21' if the
- * login time is < 6 days.
- */
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1989, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
- #if 0
- #ifndef lint
- static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95";
- #endif
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- /*
- * Finger prints out information about users. It is not portable since
- * certain fields (e.g. the full user name, office, and phone numbers) are
- * extracted from the gecos field of the passwd file which other UNIXes
- * may not have or may use for other things.
- *
- * There are currently two output formats; the short format is one line
- * per user and displays login name, tty, login time, real name, idle time,
- * and either remote host information (default) or office location/phone
- * number, depending on if -h or -o is used respectively.
- * The long format gives the same information (in a more legible format) as
- * well as home directory, shell, mail info, and .plan/.project files.
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <db.h>
- #include <err.h>
- #include <pwd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <unistd.h>
- #include <utmpx.h>
- #include <locale.h>
- #include "finger.h"
- #include "pathnames.h"
- DB *db;
- time_t now;
- int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag;
- sa_family_t family = PF_UNSPEC;
- int d_first = -1;
- char tbuf[1024];
- int invoker_root = 0;
- static void loginlist(void);
- static int option(int, char **);
- static void usage(void);
- static void userlist(int, char **);
- static int
- option(int argc, char **argv)
- {
- int ch;
- optind = 1; /* reset getopt */
- while ((ch = getopt(argc, argv, "46gklmpsho")) != -1)
- switch(ch) {
- case '4':
- family = AF_INET;
- break;
- case '6':
- family = AF_INET6;
- break;
- case 'g':
- gflag = 1;
- break;
- case 'k':
- kflag = 1; /* keep going without utmp */
- break;
- case 'l':
- lflag = 1; /* long format */
- break;
- case 'm':
- mflag = 1; /* force exact match of names */
- break;
- case 'p':
- pplan = 1; /* don't show .plan/.project */
- break;
- case 's':
- sflag = 1; /* short format */
- break;
- case 'h':
- oflag = 0; /* remote host info */
- break;
- case 'o':
- oflag = 1; /* office info */
- break;
- case '?':
- default:
- usage();
- }
- return optind;
- }
- static void
- usage(void)
- {
- (void)fprintf(stderr,
- "usage: finger [-46gklmpsho] [user ...] [user@host ...]\n");
- exit(1);
- }
- int
- main(int argc, char **argv)
- {
- int envargc, argcnt;
- char *envargv[3];
- struct passwd *pw;
- static char myname[] = "finger";
- if (getuid() == 0 || geteuid() == 0) {
- invoker_root = 1;
- if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
- if (setgid(pw->pw_gid) != 0)
- err(1, "setgid()");
- if (setuid(pw->pw_uid) != 0)
- err(1, "setuid()");
- } else {
- if (setgid(UNPRIV_UGID) != 0)
- err(1, "setgid()");
- if (setuid(UNPRIV_UGID) != 0)
- err(1, "setuid()");
- }
- }
- (void) setlocale(LC_ALL, "");
- /* remove this line to get remote host */
- oflag = 1; /* default to old "office" behavior */
- /*
- * Process environment variables followed by command line arguments.
- */
- if ((envargv[1] = getenv("FINGER"))) {
- envargc = 2;
- envargv[0] = myname;
- envargv[2] = NULL;
- (void) option(envargc, envargv);
- }
- argcnt = option(argc, argv);
- argc -= argcnt;
- argv += argcnt;
- (void)time(&now);
- setpassent(1);
- if (!*argv) {
- /*
- * Assign explicit "small" format if no names given and -l
- * not selected. Force the -s BEFORE we get names so proper
- * screening will be done.
- */
- if (!lflag)
- sflag = 1; /* if -l not explicit, force -s */
- loginlist();
- if (entries == 0)
- (void)printf("No one logged on.\n");
- } else {
- userlist(argc, argv);
- /*
- * Assign explicit "large" format if names given and -s not
- * explicitly stated. Force the -l AFTER we get names so any
- * remote finger attempts specified won't be mishandled.
- */
- if (!sflag)
- lflag = 1; /* if -s not explicit, force -l */
- }
- if (entries) {
- if (lflag)
- lflag_print();
- else
- sflag_print();
- }
- return (0);
- }
- static void
- loginlist(void)
- {
- PERSON *pn;
- DBT data, key;
- struct passwd *pw;
- struct utmpx *user;
- int r, sflag1;
- if (kflag)
- errx(1, "can't list logins without reading utmp");
- setutxent();
- while ((user = getutxent()) != NULL) {
- if (user->ut_type != USER_PROCESS)
- continue;
- if ((pn = find_person(user->ut_user)) == NULL) {
- if ((pw = getpwnam(user->ut_user)) == NULL)
- continue;
- if (hide(pw))
- continue;
- pn = enter_person(pw);
- }
- enter_where(user, pn);
- }
- endutxent();
- if (db && lflag)
- for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
- PERSON *tmp;
- r = (*db->seq)(db, &key, &data, sflag1);
- if (r == -1)
- err(1, "db seq");
- if (r == 1)
- break;
- memmove(&tmp, data.data, sizeof tmp);
- enter_lastlog(tmp);
- }
- }
- static void
- userlist(int argc, char **argv)
- {
- PERSON *pn;
- DBT data, key;
- struct utmpx *user;
- struct passwd *pw;
- int r, sflag1, *used, *ip;
- char **ap, **nargv, **np, **p;
- FILE *conf_fp;
- char conf_alias[LINE_MAX];
- char *conf_realname;
- int conf_length;
- if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
- (used = calloc(argc, sizeof(int))) == NULL)
- err(1, NULL);
- /* Pull out all network requests. */
- for (ap = p = argv, np = nargv; *p; ++p)
- if (strchr(*p, '@'))
- *np++ = *p;
- else
- *ap++ = *p;
- *np++ = NULL;
- *ap++ = NULL;
- if (!*argv)
- goto net;
- /*
- * Mark any arguments beginning with '/' as invalid so that we
- * don't accidentally confuse them with expansions from finger.conf
- */
- for (p = argv, ip = used; *p; ++p, ++ip)
- if (**p == '/') {
- *ip = 1;
- warnx("%s: no such user", *p);
- }
- /*
- * Traverse the finger alias configuration file of the form
- * alias:(user|alias), ignoring comment lines beginning '#'.
- */
- if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
- while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
- conf_length = strlen(conf_alias);
- if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
- continue;
- conf_alias[conf_length] = '\0'; /* Remove trailing LF */
- if ((conf_realname = strchr(conf_alias, ':')) == NULL)
- continue;
- *conf_realname = '\0'; /* Replace : with NUL */
- for (p = argv; *p; ++p) {
- if (strcmp(*p, conf_alias) == 0) {
- if ((*p = strdup(conf_realname+1)) == NULL) {
- err(1, NULL);
- }
- }
- }
- }
- (void)fclose(conf_fp);
- }
- /*
- * Traverse the list of possible login names and check the login name
- * and real name against the name specified by the user. If the name
- * begins with a '/', try to read the file of that name instead of
- * gathering the traditional finger information.
- */
- if (mflag)
- for (p = argv, ip = used; *p; ++p, ++ip) {
- if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
- if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
- enter_person(pw);
- else if (!*ip)
- warnx("%s: no such user", *p);
- }
- }
- else {
- while ((pw = getpwent()) != NULL) {
- for (p = argv, ip = used; *p; ++p, ++ip)
- if (**p == '/' && *ip != 1
- && show_text("", *p, ""))
- *ip = 1;
- else if (match(pw, *p) && !hide(pw)) {
- enter_person(pw);
- *ip = 1;
- }
- }
- for (p = argv, ip = used; *p; ++p, ++ip)
- if (!*ip)
- warnx("%s: no such user", *p);
- }
- /* Handle network requests. */
- net: for (p = nargv; *p;) {
- netfinger(*p++);
- if (*p || entries)
- printf("\n");
- }
- free(used);
- if (entries == 0)
- return;
- if (kflag)
- return;
- /*
- * Scan thru the list of users currently logged in, saving
- * appropriate data whenever a match occurs.
- */
- setutxent();
- while ((user = getutxent()) != NULL) {
- if (user->ut_type != USER_PROCESS)
- continue;
- if ((pn = find_person(user->ut_user)) == NULL)
- continue;
- enter_where(user, pn);
- }
- endutxent();
- if (db)
- for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
- PERSON *tmp;
- r = (*db->seq)(db, &key, &data, sflag1);
- if (r == -1)
- err(1, "db seq");
- if (r == 1)
- break;
- memmove(&tmp, data.data, sizeof tmp);
- enter_lastlog(tmp);
- }
- }