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Diffstat (limited to 'login-utils/last.c')
-rw-r--r-- | login-utils/last.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/login-utils/last.c b/login-utils/last.c new file mode 100644 index 000000000..c00808c2e --- /dev/null +++ b/login-utils/last.c @@ -0,0 +1,438 @@ +/* + * Berkeley last for Linux. Currently maintained by poe@daimi.aau.dk at + * ftp://ftp.daimi.aau.dk/pub/linux/poe/admutil* + * + * Copyright (c) 1987 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by the University of California, Berkeley. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef lint +char copyright[] = +"@(#) Copyright (c) 1987 Regents of the University of California.\n\ + All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)last.c 5.11 (Berkeley) 6/29/88"; +#endif /* not lint */ + +/* + * last + */ +#include <sys/param.h> +#include <sys/stat.h> +#include <sys/file.h> +#include <signal.h> +#include <string.h> +#include <time.h> +#include <utmp.h> +#include <stdio.h> +#include <getopt.h> +#include <stdlib.h> +#include <unistd.h> +#include <arpa/inet.h> +#include "pathnames.h" + +#define SECDAY (24*60*60) /* seconds in a day */ +#define NO 0 /* false/no */ +#define YES 1 /* true/yes */ + +static struct utmp buf[1024]; /* utmp read buffer */ + +#define HMAX (int)sizeof(buf[0].ut_host) /* size of utmp host field */ +#define LMAX (int)sizeof(buf[0].ut_line) /* size of utmp tty field */ +#define NMAX (int)sizeof(buf[0].ut_name) /* size of utmp name field */ + +typedef struct arg { + char *name; /* argument */ +#define HOST_TYPE -2 +#define TTY_TYPE -3 +#define USER_TYPE -4 +#define INET_TYPE -5 + int type; /* type of arg */ + struct arg *next; /* linked list pointer */ +} ARG; +ARG *arglist; /* head of linked list */ + +typedef struct ttytab { + long logout; /* log out time */ + char tty[LMAX + 1]; /* terminal name */ + struct ttytab *next; /* linked list pointer */ +} TTY; +TTY *ttylist; /* head of linked list */ + +static long currentout, /* current logout value */ + maxrec; /* records to display */ +static char *file = _PATH_WTMP; /* wtmp file */ + +static int doyear = 0; /* output year in dates */ +static int dolong = 0; /* print also ip-addr */ + +static void wtmp(), addarg(), hostconv(); +static int want(); +TTY *addtty(); +static char *ttyconv(); + +int +main(argc, argv) + int argc; + char **argv; +{ + extern int optind; + extern char *optarg; + int ch; + + while ((ch = getopt(argc, argv, "0123456789yli:f:h:t:")) != EOF) + switch((char)ch) { + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + /* + * kludge: last was originally designed to take + * a number after a dash. + */ + if (!maxrec) + maxrec = atol(argv[optind - 1] + 1); + break; + case 'f': + file = optarg; + break; + case 'h': + hostconv(optarg); + addarg(HOST_TYPE, optarg); + break; + case 't': + addarg(TTY_TYPE, ttyconv(optarg)); + break; + case 'y': + doyear = 1; + break; + case 'l': + dolong = 1; + break; + case 'i': + addarg(INET_TYPE, optarg); + break; + case '?': + default: + fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr); + exit(1); + } + for (argv += optind; *argv; ++argv) { +#define COMPATIBILITY +#ifdef COMPATIBILITY + /* code to allow "last p5" to work */ + addarg(TTY_TYPE, ttyconv(*argv)); +#endif + addarg(USER_TYPE, *argv); + } + wtmp(); + exit(0); +} + +/* + * print_partial_line -- + * print the first part of each output line according to specified format + */ +void +print_partial_line(bp) + struct utmp *bp; +{ + char *ct; + + ct = ctime(&bp->ut_time); + printf("%-*.*s %-*.*s ", NMAX, NMAX, bp->ut_name, + LMAX, LMAX, bp->ut_line); + + if (dolong) { + if (bp->ut_addr) { + struct in_addr foo; + foo.s_addr = bp->ut_addr; + printf("%-*.*s ", HMAX, HMAX, inet_ntoa(foo)); + } else { + printf("%-*.*s ", HMAX, HMAX, ""); + } + } else { + printf("%-*.*s ", HMAX, HMAX, bp->ut_host); + } + + if (doyear) { + printf("%10.10s %4.4s %5.5s ", ct, ct + 20, ct + 11); + } else { + printf("%10.10s %5.5s ", ct, ct + 11); + } +} + +/* + * wtmp -- + * read through the wtmp file + */ +static void +wtmp() +{ + register struct utmp *bp; /* current structure */ + register TTY *T; /* tty list entry */ + struct stat stb; /* stat of file for size */ + long bl, delta, /* time difference */ + lseek(), time(); + int bytes, wfd; + void onintr(); + char *ct, *crmsg; + + if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) { + perror(file); + exit(1); + } + bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); + + (void)time(&buf[0].ut_time); + (void)signal(SIGINT, onintr); + (void)signal(SIGQUIT, onintr); + + while (--bl >= 0) { + if (lseek(wfd, (long)(bl * sizeof(buf)), L_SET) == -1 || + (bytes = read(wfd, (char *)buf, sizeof(buf))) == -1) { + fprintf(stderr, "last: %s: ", file); + perror((char *)NULL); + exit(1); + } + for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { + /* + * if the terminal line is '~', the machine stopped. + * see utmp(5) for more info. + */ + if (!strncmp(bp->ut_line, "~", LMAX)) { + /* everybody just logged out */ + for (T = ttylist; T; T = T->next) + T->logout = -bp->ut_time; + currentout = -bp->ut_time; + crmsg = strncmp(bp->ut_name, "shutdown", NMAX) ? "crash" : "down "; + if (!bp->ut_name[0]) + (void)strcpy(bp->ut_name, "reboot"); + if (want(bp, NO)) { + ct = ctime(&bp->ut_time); + if(bp->ut_type != LOGIN_PROCESS) { + print_partial_line(bp); + putchar('\n'); + } + if (maxrec && !--maxrec) + return; + } + continue; + } + /* find associated tty */ + for (T = ttylist;; T = T->next) { + if (!T) { + /* add new one */ + T = addtty(bp->ut_line); + break; + } + if (!strncmp(T->tty, bp->ut_line, LMAX)) + break; + } + if (bp->ut_name[0] && bp->ut_type != LOGIN_PROCESS + && want(bp, YES)) { + + print_partial_line(bp); + + if (!T->logout) + puts(" still logged in"); + else { + if (T->logout < 0) { + T->logout = -T->logout; + printf("- %s", crmsg); + } + else + printf("- %5.5s", ctime(&T->logout)+11); + delta = T->logout - bp->ut_time; + if (delta < SECDAY) + printf(" (%5.5s)\n", asctime(gmtime(&delta))+11); + else + printf(" (%ld+%5.5s)\n", delta / SECDAY, asctime(gmtime(&delta))+11); + } + if (maxrec != -1 && !--maxrec) + return; + } + T->logout = bp->ut_time; + } + } + ct = ctime(&buf[0].ut_time); + printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); +} + +/* + * want -- + * see if want this entry + */ +static int +want(bp, check) + register struct utmp *bp; + int check; +{ + register ARG *step; + + if (check) + /* + * when uucp and ftp log in over a network, the entry in + * the utmp file is the name plus their process id. See + * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. + */ + if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) + bp->ut_line[3] = '\0'; + else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) + bp->ut_line[4] = '\0'; + if (!arglist) + return(YES); + + for (step = arglist; step; step = step->next) + switch(step->type) { + case HOST_TYPE: + if (!strncmp(step->name, bp->ut_host, HMAX)) + return(YES); + break; + case TTY_TYPE: + if (!strncmp(step->name, bp->ut_line, LMAX)) + return(YES); + break; + case USER_TYPE: + if (!strncmp(step->name, bp->ut_name, NMAX)) + return(YES); + break; + case INET_TYPE: + if (bp->ut_addr == inet_addr(step->name)) + return(YES); + break; + } + return(NO); +} + +/* + * addarg -- + * add an entry to a linked list of arguments + */ +static void +addarg(type, arg) + int type; + char *arg; +{ + register ARG *cur; + + if (!(cur = (ARG *)malloc((unsigned int)sizeof(ARG)))) { + fputs("last: malloc failure.\n", stderr); + exit(1); + } + cur->next = arglist; + cur->type = type; + cur->name = arg; + arglist = cur; +} + +/* + * addtty -- + * add an entry to a linked list of ttys + */ +TTY * +addtty(ttyname) + char *ttyname; +{ + register TTY *cur; + + if (!(cur = (TTY *)malloc((unsigned int)sizeof(TTY)))) { + fputs("last: malloc failure.\n", stderr); + exit(1); + } + cur->next = ttylist; + cur->logout = currentout; + memcpy(cur->tty, ttyname, LMAX); + return(ttylist = cur); +} + +/* + * hostconv -- + * convert the hostname to search pattern; if the supplied host name + * has a domain attached that is the same as the current domain, rip + * off the domain suffix since that's what login(1) does. + */ +static void +hostconv(arg) + char *arg; +{ + static int first = 1; + static char *hostdot, + name[MAXHOSTNAMELEN]; + char *argdot; + + if (!(argdot = strchr(arg, '.'))) + return; + if (first) { + first = 0; + if (gethostname(name, sizeof(name))) { + perror("last: gethostname"); + exit(1); + } + hostdot = strchr(name, '.'); + } + if (hostdot && !strcmp(hostdot, argdot)) + *argdot = '\0'; +} + +/* + * ttyconv -- + * convert tty to correct name. + */ +static char * +ttyconv(arg) + char *arg; +{ + char *mval; + + /* + * kludge -- we assume that all tty's end with + * a two character suffix. + */ + if (strlen(arg) == 2) { + /* either 6 for "ttyxx" or 8 for "console" */ + if (!(mval = malloc((unsigned int)8))) { + fputs("last: malloc failure.\n", stderr); + exit(1); + } + if (!strcmp(arg, "co")) + (void)strcpy(mval, "console"); + else { + (void)strcpy(mval, "tty"); + (void)strcpy(mval + 3, arg); + } + return(mval); + } + if (!strncmp(arg, "/dev/", sizeof("/dev/") - 1)) + return(arg + 5); + return(arg); +} + +/* + * onintr -- + * on interrupt, we inform the user how far we've gotten + */ +void +onintr(signo) + int signo; +{ + char *ct; + + ct = ctime(&buf[0].ut_time); + printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); + if (signo == SIGINT) + exit(1); + (void)fflush(stdout); /* fix required for rsh */ +} |