source: trunk/athena/bin/lpr/lpc.c @ 4368

/*
 *      $Source: /afs/dev.mit.edu/source/repository/athena/bin/lpr/lpc.c,v $
 *      $Header: /afs/dev.mit.edu/source/repository/athena/bin/lpr/lpc.c,v 1.6 1991-02-09 13:15:37 epeisach Exp $
 */

#ifndef lint
static char *rcsid_lpc_c = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/lpr/lpc.c,v 1.6 1991-02-09 13:15:37 epeisach Exp $";
#endif lint

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)lpc.c       5.2 (Berkeley) 11/17/85";
#endif not lint

#ifdef OPERATOR
#define GETUID geteuid
#else
#define GETUID getuid
#endif

/*
 * lpc -- line printer control program
 */
#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <setjmp.h>
#include <syslog.h>
#include <netdb.h>
  
#ifdef OPERATOR
#include <pwd.h>
#endif


#include "lpc.h"

int     fromatty;

char    cmdline[200];
int     margc;
char    *margv[20];
int     top;
int     intr();
struct  cmd *getcmd();
extern struct cmd cmdtab[];

jmp_buf toplevel;

main(argc, argv)
        char *argv[];
{
        register struct cmd *c;
        extern char *name;

        name = argv[0];
#ifdef LOG_AUTH
#ifdef OPERATOR
        openlog("lpc", 0, LOG_AUTH);
#else
        openlog("lpd", 0, LOG_LPR);
#endif
#else /* not LOG_AUTH */
#ifdef OPERATOR
        openlog("lpc", 0);
#else
        openlog("lpd", 0);
#endif
#endif /* LOG_AUTH */
        if (--argc > 0) {
                c = getcmd(*++argv);
                if (c == (struct cmd *)-1) {
                        printf("?Ambiguous command\n");
                        exit(1);
                }
                if (c == 0) {
                        printf("?Invalid command\n");
                        exit(1);
                }
                if (c->c_priv && GETUID()) {
                        printf("?Privileged command\n");
                        exit(1);
                }
#ifdef OPERATOR
                log_cmdline(argc, argv);
#endif
                (*c->c_handler)(argc, argv);
                exit(0);
        }
        fromatty = isatty(fileno(stdin));
        top = setjmp(toplevel) == 0;
        if (top)
                signal(SIGINT, intr);
        for (;;) {
                cmdscanner(top);
                top = 1;
        }
}

intr()
{
        if (!fromatty)
                exit(0);
        longjmp(toplevel, 1);
}

/*
 * Command parser.
 */
cmdscanner(top)
        int top;
{
        register struct cmd *c;
        extern int help();

        if (!top)
                putchar('\n');
        for (;;) {
                if (fromatty) {
                        printf("lpc> ");
                        fflush(stdout);
                }
                if (gets(cmdline) == 0)
                        quit();
                if (cmdline[0] == 0)
                        break;
                makeargv();
                c = getcmd(margv[0]);
                if (c == (struct cmd *)-1) {
                        printf("?Ambiguous command\n");
                        continue;
                }
                if (c == 0) {
                        printf("?Invalid command\n");
                        continue;
                }
                if (c->c_priv && GETUID()) {
                        printf("?Privileged command\n");
                        continue;
                }
#ifdef OPERATOR
                log_cmdline(margc, margv);
#endif
                (*c->c_handler)(margc, margv);
        }
        longjmp(toplevel, 0);
}

struct cmd *
getcmd(name)
        register char *name;
{
        register char *p, *q;
        register struct cmd *c, *found;
        register int nmatches, longest;

        longest = 0;
        nmatches = 0;
        found = 0;
        for (c = cmdtab; p = c->c_name; c++) {
                for (q = name; *q == *p++; q++)
                        if (*q == 0)            /* exact match? */
                                return(c);
                if (!*q) {                      /* the name was a prefix */
                        if (q - name > longest) {
                                longest = q - name;
                                nmatches = 1;
                                found = c;
                        } else if (q - name == longest)
                                nmatches++;
                }
        }
        if (nmatches > 1)
                return((struct cmd *)-1);
        return(found);
}

/*
 * Slice a string up into argc/argv.
 */
makeargv()
{
        register char *cp;
        register char **argp = margv;

        margc = 0;
        for (cp = cmdline; *cp;) {
                while (isspace(*cp))
                        cp++;
                if (*cp == '\0')
                        break;
                *argp++ = cp;
                margc += 1;
                while (*cp != '\0' && !isspace(*cp))
                        cp++;
                if (*cp == '\0')
                        break;
                *cp++ = '\0';
        }
        *argp++ = 0;
}

#define HELPINDENT (sizeof ("directory"))

/*
 * Help command.
 */
help(argc, argv)
        int argc;
        char *argv[];
{
        register struct cmd *c;

        if (argc == 1) {
                register int i, j, w;
                int columns, width = 0, lines;
                extern int NCMDS;

                printf("Commands may be abbreviated.  Commands are:\n\n");
                for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
                        int len;
                        if (!c->c_name)
                            continue;
                        len = strlen(c->c_name);

                        if (len > width)
                                width = len;
                }
                width = (width + 8) &~ 7;
                columns = 80 / width;
                if (columns == 0)
                        columns = 1;
                lines = (NCMDS + columns - 1) / columns;
                for (i = 0; i < lines; i++) {
                        for (j = 0; j < columns; j++) {
                                c = cmdtab + j * lines + i;
                                if(c->c_name) printf("%s", c->c_name);
                                if (c + lines >= &cmdtab[NCMDS]) {
                                        printf("\n");
                                        break;
                                }
                                w = strlen(c->c_name);
                                while (w < width) {
                                        w = (w + 8) &~ 7;
                                        putchar('\t');
                                }
                        }
                }
                return;
        }
        while (--argc > 0) {
                register char *arg;
                arg = *++argv;
                c = getcmd(arg);
                if (c == (struct cmd *)-1)
                        printf("?Ambiguous help command %s\n", arg);
                else if (c == (struct cmd *)0)
                        printf("?Invalid help command %s\n", arg);
                else
                        printf("%-*s\t%s\n", HELPINDENT,
                                c->c_name, c->c_help);
        }
        return;
}

#ifdef OPERATOR
log_cmdline(argc, argv)
     int argc;
     char *argv[];
{
        struct passwd   *pwentry;
        char            *name;
        char            logbuf[512];
        register int    i;
                                        /* note getuid() returns real uid */
        pwentry = getpwuid(getuid()); /* get password entry for invoker */
        name = pwentry->pw_name; /* get his name */

        sprintf(logbuf,"%s LPC: ",name);
        for (i=0 ;i < argc; i++) {
                strcat(logbuf,argv[i]);
                strcat(logbuf," ");
        }
        syslog(LOG_INFO, logbuf);
        return(0);
}

#endif