576 lines
12 KiB
C
576 lines
12 KiB
C
/* $NetBSD: pcnfsd_misc.c,v 1.17 2020/04/22 23:46:02 joerg Exp $ */
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/* RE_SID: @(%)/usr/dosnfs/shades_SCCS/unix/pcnfsd/v2/src/SCCS/s.pcnfsd_misc.c 1.5 92/01/24 19:59:13 SMI */
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/*
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**=====================================================================
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** Copyright (c) 1986,1987,1988,1989,1990,1991 by Sun Microsystems, Inc.
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** @(#)pcnfsd_misc.c 1.5 1/24/92
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**=====================================================================
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*/
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/*
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**=====================================================================
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** I N C L U D E F I L E S E C T I O N *
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** *
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** If your port requires different include files, add a suitable *
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** #define in the customization section, and make the inclusion or *
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** exclusion of the files conditional on this. *
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**=====================================================================
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*/
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <signal.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 <unistd.h>
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#include <util.h>
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#ifdef SUPPORT_UTMPX
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#include <utmpx.h>
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#endif
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#ifdef ISC_2_0
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#include <sys/fcntl.h>
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#endif
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#ifdef SHADOW_SUPPORT
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#include <shadow.h>
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#endif
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#ifdef WTMP
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int wtmp_enabled = 1;
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#endif
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#include "common.h"
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#include "pcnfsd.h"
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#include "extern.h"
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/*
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**---------------------------------------------------------------------
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** Other #define's
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**---------------------------------------------------------------------
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*/
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#define zchar 0x5b
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char *mapfont(char, char, char);
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void myhandler(int);
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void start_watchdog(int);
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void stop_watchdog(void);
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/*
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**=====================================================================
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** C O D E S E C T I O N *
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**=====================================================================
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*/
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/*
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**---------------------------------------------------------------------
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** Support procedures
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**---------------------------------------------------------------------
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*/
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void
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scramble(char *s1, char *s2)
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{
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while (*s1) {
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*s2++ = (*s1 ^ zchar) & 0x7f;
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s1++;
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}
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*s2 = 0;
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}
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struct passwd *
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get_password(char *usrnam)
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{
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struct passwd *p;
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static struct passwd localp;
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__aconst char *pswd, *ushell;
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#ifdef SHADOW_SUPPORT
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struct spwd *sp;
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int shadowfile;
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#endif
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#ifdef SHADOW_SUPPORT
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/*
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**--------------------------------------------------------------
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** Check the existence of SHADOW. If it is there, then we are
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** running a two-password-file system.
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**--------------------------------------------------------------
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*/
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if (access(SHADOW, 0))
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shadowfile = 0; /* SHADOW is not there */
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else
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shadowfile = 1;
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setpwent();
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if (shadowfile)
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(void) setspent(); /* Setting the shadow password file */
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if ((p = getpwnam(usrnam)) == NULL ||
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(shadowfile && (sp = getspnam(usrnam)) == NULL))
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return (NULL);
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if (shadowfile) {
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pswd = sp->sp_pwdp;
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(void) endspent();
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} else
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pswd = p->pw_passwd;
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#else
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p = getpwnam(usrnam);
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if (p == NULL)
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return (NULL);
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pswd = p->pw_passwd;
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#endif
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#ifdef ISC_2_0
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/* *----------------------------------------------------------- * We
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* may have an 'x' in which case look in /etc/shadow ..
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* *----------------------------------------------------------- */
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if (((strlen(pswd)) == 1) && pswd[0] == 'x') {
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struct spwd *shadow = getspnam(usrnam);
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if (!shadow)
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return (NULL);
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pswd = shadow->sp_pwdp;
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}
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#endif
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localp = *p;
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localp.pw_passwd = pswd;
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#ifdef USE_GETUSERSHELL
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setusershell();
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while (ushell = getusershell()) {
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if (!strcmp(ushell, localp.pw_shell)) {
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ok = 1;
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break;
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}
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}
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endusershell();
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if (!ok)
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return (NULL);
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#else
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/*
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* the best we can do is to ensure that the shell ends in "sh"
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*/
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ushell = localp.pw_shell;
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if (strlen(ushell) < 2)
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return (NULL);
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ushell += strlen(ushell) - 2;
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if (strcmp(ushell, "sh"))
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return (NULL);
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#endif
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return (&localp);
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}
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/*
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**---------------------------------------------------------------------
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** Print support procedures
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**---------------------------------------------------------------------
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*/
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char *
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mapfont(char f, char i, char b)
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{
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static char fontname[64];
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fontname[0] = 0; /* clear it out */
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switch (f) {
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case 'c':
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(void) strlcpy(fontname, "Courier", sizeof(fontname));
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break;
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case 'h':
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(void) strlcpy(fontname, "Helvetica", sizeof(fontname));
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break;
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case 't':
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(void) strlcpy(fontname, "Times", sizeof(fontname));
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break;
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default:
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(void) strlcpy(fontname, "Times-Roman", sizeof(fontname));
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goto finis;
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}
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if (i != 'o' && b != 'b') { /* no bold or oblique */
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if (f == 't') /* special case Times */
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(void) strlcat(fontname, "-Roman", sizeof(fontname));
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goto finis;
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}
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(void) strlcat(fontname, "-", sizeof(fontname));
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if (b == 'b')
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(void) strlcat(fontname, "Bold", sizeof(fontname));
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if (i == 'o') /* o-blique */
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(void) strlcat(fontname, f == 't' ? "Italic" : "Oblique",
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sizeof(fontname));
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finis: return (&fontname[0]);
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}
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/*
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* run_ps630 performs the Diablo 630 emulation filtering process. ps630
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* was broken in certain Sun releases: it would not accept point size or
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* font changes. If your version is fixed, undefine the symbol
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* PS630_IS_BROKEN and rebuild pc-nfsd.
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*/
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/* #define PS630_IS_BROKEN 1 */
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void
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run_ps630(char *f, char *opts)
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{
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char temp_file[256];
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char commbuf[256];
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int i;
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(void) strlcpy(temp_file, f, sizeof(temp_file));
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(void) strlcat(temp_file, "X", sizeof(temp_file)); /* intermediate file name */
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#ifndef PS630_IS_BROKEN
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(void) snprintf(commbuf, sizeof(commbuf), "ps630 -s %c%c -p %s -f ",
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opts[2], opts[3], temp_file);
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(void) strlcat(commbuf, mapfont(opts[4], opts[5], opts[6]),
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sizeof(commbuf));
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(void) strlcat(commbuf, " -F ", sizeof(commbuf));
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(void) strlcat(commbuf, mapfont(opts[7], opts[8], opts[9]),
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sizeof(commbuf));
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(void) strlcat(commbuf, " ", sizeof(commbuf));
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(void) strlcat(commbuf, f, sizeof(commbuf));
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#else /* PS630_IS_BROKEN */
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/*
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* The pitch and font features of ps630 appear to be broken at
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* this time.
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*/
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(void) snprintf(commbuf, sizeof(commbuf), "ps630 -p %s %s",
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temp_file, f);
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#endif /* PS630_IS_BROKEN */
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if ((i = system(commbuf)) != 0) {
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/*
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* Under (un)certain conditions, ps630 may return -1 even
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* if it worked. Hence the commenting out of this error
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* report.
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*/
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/* (void)fprintf(stderr, "\n\nrun_ps630 rc = %d\n", i) */ ;
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/* exit(1); */
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}
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if (rename(temp_file, f)) {
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perror("run_ps630: rename");
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exit(1);
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}
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return;
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}
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/*
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**---------------------------------------------------------------------
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** WTMP update support
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**---------------------------------------------------------------------
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*/
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#ifdef WTMP
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void
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wlogin(char *name, struct svc_req *req)
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{
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struct sockaddr_in *who;
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struct hostent *hp;
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char *host;
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if (!wtmp_enabled)
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return;
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/* Get network address of client. */
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who = &req->rq_xprt->xp_raddr;
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/* Get name of connected client */
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hp = gethostbyaddr((char *) &who->sin_addr,
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sizeof(struct in_addr),
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who->sin_family);
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if (hp) {
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host = hp->h_name;
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} else {
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host = inet_ntoa(who->sin_addr);
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}
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#ifdef SUPPORT_UTMP
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logwtmp("PC-NFS", name, host);
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#endif
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#ifdef SUPPORT_UTMPX
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logwtmpx("PC-NFS", name, host, 0, USER_PROCESS);
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#endif
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}
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#endif /* WTMP */
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/*
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**---------------------------------------------------------------------
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** Run-process-as-user procedures
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**---------------------------------------------------------------------
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*/
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#define READER_FD 0
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#define WRITER_FD 1
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static int child_pid;
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static char cached_user[64] = "";
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static uid_t cached_uid;
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static gid_t cached_gid;
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static struct sigaction old_action;
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static struct sigaction new_action;
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static struct itimerval timer;
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int interrupted = 0;
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static FILE *pipe_handle;
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void
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myhandler(int dummy)
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{
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interrupted = 1;
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fclose(pipe_handle);
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kill(child_pid, SIGKILL);
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msg_out("rpc.pcnfsd: su_popen timeout - killed child process");
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}
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void
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start_watchdog(int n)
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{
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/*
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* Setup SIGALRM handler, force interrupt of ongoing syscall
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*/
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new_action.sa_handler = myhandler;
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sigemptyset(&(new_action.sa_mask));
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new_action.sa_flags = 0;
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#ifdef SA_INTERRUPT
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new_action.sa_flags |= SA_INTERRUPT;
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#endif
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sigaction(SIGALRM, &new_action, &old_action);
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/*
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* Set interval timer for n seconds
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*/
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timer.it_interval.tv_sec = 0;
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timer.it_interval.tv_usec = 0;
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timer.it_value.tv_sec = n;
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timer.it_value.tv_usec = 0;
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setitimer(ITIMER_REAL, &timer, NULL);
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interrupted = 0;
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}
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void
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stop_watchdog()
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{
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/*
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* Cancel timer
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*/
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timer.it_interval.tv_sec = 0;
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timer.it_interval.tv_usec = 0;
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timer.it_value.tv_sec = 0;
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timer.it_value.tv_usec = 0;
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setitimer(ITIMER_REAL, &timer, NULL);
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/*
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* restore old signal handling
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*/
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sigaction(SIGALRM, &old_action, NULL);
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}
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FILE *
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su_popen(char *user, char *cmd, int maxtime)
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{
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int p[2];
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int parent_fd, child_fd, pid;
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struct passwd *pw;
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if (strcmp(cached_user, user)) {
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pw = getpwnam(user);
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if (!pw)
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pw = getpwnam("nobody");
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if (pw) {
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cached_uid = pw->pw_uid;
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cached_gid = pw->pw_gid;
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strlcpy(cached_user, user, sizeof(cached_user));
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} else {
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cached_uid = (uid_t) (-2);
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cached_gid = (gid_t) (-2);
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cached_user[0] = '\0';
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}
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}
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if (pipe(p) < 0) {
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msg_out("rpc.pcnfsd: unable to create pipe in su_popen");
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return (NULL);
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}
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parent_fd = p[READER_FD];
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child_fd = p[WRITER_FD];
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if ((pid = fork()) == 0) {
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int i;
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for (i = 0; i < 10; i++)
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if (i != child_fd)
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(void) close(i);
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if (child_fd != 1) {
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(void) dup2(child_fd, 1);
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(void) close(child_fd);
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}
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dup2(1, 2); /* let's get stderr as well */
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(void) setgid(cached_gid);
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(void) setuid(cached_uid);
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(void) execl("/bin/sh", "sh", "-c", cmd, (char *) NULL);
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_exit(255);
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}
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if (pid == -1) {
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msg_out("rpc.pcnfsd: fork failed");
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close(parent_fd);
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close(child_fd);
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return (NULL);
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}
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child_pid = pid;
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close(child_fd);
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start_watchdog(maxtime);
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pipe_handle = fdopen(parent_fd, "r");
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return (pipe_handle);
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}
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int
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su_pclose(FILE *ptr)
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{
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int pid, status;
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stop_watchdog();
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fclose(ptr);
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if (child_pid == -1)
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return (-1);
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while ((pid = wait(&status)) != child_pid && pid != -1);
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return (pid == -1 ? -1 : status);
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}
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/*
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** The following routine reads a file "/etc/pcnfsd.conf" if present,
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** and uses it to replace certain builtin elements, like the
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** name of the print spool directory. The configuration file
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** Is the usual kind: Comments begin with '#', blank lines are ignored,
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** and valid lines are of the form
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**
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** <keyword><whitespace><value>
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**
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** The following keywords are recognized:
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**
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** spooldir
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** printer name alias-for command
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** wtmp yes|no
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*/
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static void
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config_from_file(void)
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{
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FILE *fd;
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char buff[1024];
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char *cp;
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char *kw;
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char *val;
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char *arg1;
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char *arg2;
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if ((fd = fopen("/etc/pcnfsd.conf", "r")) == NULL)
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return;
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while (fgets(buff, 1024, fd)) {
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cp = strchr(buff, '\n');
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*cp = '\0';
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cp = strchr(buff, '#');
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if (cp)
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*cp = '\0';
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kw = strtok(buff, " \t");
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if (kw == NULL)
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continue;
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val = strtok(NULL, " \t");
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if (val == NULL)
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continue;
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if (!strcasecmp(kw, "spooldir")) {
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strlcpy(sp_name, val, sizeof(sp_name));
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continue;
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}
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#ifdef WTMP
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if (!strcasecmp(kw, "wtmp")) {
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/* assume default is YES, just look for negatives */
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if (!strcasecmp(val, "no") ||
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!strcasecmp(val, "off") ||
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!strcasecmp(val, "disable") ||
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!strcmp(val, "0"))
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wtmp_enabled = 0;
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continue;
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}
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#endif
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if (!strcasecmp(kw, "printer")) {
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arg1 = strtok(NULL, " \t");
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arg2 = strtok(NULL, "");
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(void) add_printer_alias(val, arg1, arg2);
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continue;
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}
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/*
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** Add new cases here
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*/
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}
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fclose(fd);
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}
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/*
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** hack for main() - call config_from_file() then the real main
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** in the rpcgen output, which is hacked by CPPFLAGS to be "mymain"
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*/
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#undef main
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int mymain(int argc, char *argv[]);
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int
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main(int argc, char *argv[])
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{
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config_from_file();
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return mymain(argc, argv);
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}
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/*
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** strembedded - returns true if s1 is embedded (in any case) in s2
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*/
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int
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strembedded(const char *s1, const char *s2)
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{
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while (*s2) {
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if (!strcasecmp(s1, s2))
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return 1;
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s2++;
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}
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return 0;
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}
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