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freebsd/usr.sbin/ppp/systems.c

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/*
* System configuration routines
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* 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 Internet Initiative Japan, Inc. The name of the
* IIJ 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.
*
* $Id: systems.c,v 1.26 1997/11/13 14:43:20 brian Exp $
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*
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* TODO:
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <ctype.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mbuf.h"
#include "log.h"
#include "id.h"
#include "defs.h"
#include "timer.h"
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#include "fsm.h"
#include "loadalias.h"
#include "command.h"
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#include "ipcp.h"
#include "pathnames.h"
#include "vars.h"
#include "server.h"
#include "chat.h"
#include "systems.h"
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#define issep(ch) ((ch) == ' ' || (ch) == '\t')
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FILE *
OpenSecret(char *file)
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{
FILE *fp;
char line[100];
snprintf(line, sizeof line, "%s/%s", _PATH_PPP, file);
fp = ID0fopen(line, "r");
if (fp == NULL)
LogPrintf(LogWARN, "OpenSecret: Can't open %s.\n", line);
return (fp);
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}
void
CloseSecret(FILE * fp)
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{
fclose(fp);
}
/* Move string from ``from'' to ``to'', interpreting ``~'' and $.... */
static void
InterpretArg(char *from, char *to)
{
const char *env;
char *ptr, *startto, *endto;
int len;
startto = to;
endto = to + LINE_LEN - 1;
while(issep(*from))
from++;
if (*from == '~') {
ptr = strchr(++from, '/');
len = ptr ? ptr - from : strlen(from);
if (len == 0) {
if ((env = getenv("HOME")) == NULL)
env = _PATH_PPP;
strncpy(to, env, endto - to);
} else {
struct passwd *pwd;
strncpy(to, from, len);
to[len] = '\0';
pwd = getpwnam(to);
if (pwd)
strncpy(to, pwd->pw_dir, endto-to);
else
strncpy(to, _PATH_PPP, endto - to);
endpwent();
}
*endto = '\0';
to += strlen(to);
from += len;
}
while (to < endto && *from != '\0') {
if (*from == '$') {
if (from[1] == '$') {
*to = '\0'; /* For an empty var name below */
from += 2;
} else if (from[1] == '{') {
ptr = strchr(from+2, '}');
if (ptr) {
len = ptr - from - 2;
if (endto - to < len )
len = endto - to;
if (len) {
strncpy(to, from+2, len);
to[len] = '\0';
from = ptr+1;
} else {
*to++ = *from++;
continue;
}
} else {
*to++ = *from++;
continue;
}
} else {
ptr = to;
for (from++; (isalnum(*from) || *from == '_') && ptr < endto; from++)
*ptr++ = *from;
*ptr = '\0';
}
if (*to == '\0')
*to++ = '$';
else if ((env = getenv(to)) != NULL) {
strncpy(to, env, endto - to);
*endto = '\0';
to += strlen(to);
}
} else
*to++ = *from++;
}
while (to > startto) {
to--;
if (!issep(*to)) {
to++;
break;
}
}
*to = '\0';
}
#define CTRL_UNKNOWN (0)
#define CTRL_INCLUDE (1)
static int
DecodeCtrlCommand(char *line, char *arg)
{
if (!strncasecmp(line, "include", 7) && issep(line[7])) {
InterpretArg(line+8, arg);
return CTRL_INCLUDE;
}
return CTRL_UNKNOWN;
}
static int userok;
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int
AllowUsers(struct cmdtab const *list, int argc, char **argv)
{
int f;
char *user;
userok = 0;
user = getlogin();
if (user && *user)
for (f = 0; f < argc; f++)
if (!strcmp("*", argv[f]) || !strcmp(user, argv[f])) {
userok = 1;
break;
}
return 0;
}
static struct {
int mode;
char *name;
} modes[] = {
{ MODE_INTER, "interactive" },
{ MODE_AUTO, "auto" },
{ MODE_DIRECT, "direct" },
{ MODE_DEDICATED, "dedicated" },
{ MODE_DDIAL, "ddial" },
{ MODE_BACKGROUND, "background" },
{ ~0, "*" },
{ 0, 0 }
};
static int modeok;
int
AllowModes(struct cmdtab const *list, int argc, char **argv)
{
int f;
int m;
int allowed;
allowed = 0;
for (f = 0; f < argc; f++) {
for (m = 0; modes[m].mode; m++)
if (!strcasecmp(modes[m].name, argv[f])) {
allowed |= modes[m].mode;
break;
}
if (modes[m].mode == 0)
LogPrintf(LogWARN, "%s: Invalid mode\n", argv[f]);
}
modeok = (mode | allowed) == allowed ? 1 : 0;
return 0;
}
static int
ReadSystem(const char *name, const char *file, int doexec)
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{
FILE *fp;
char *cp, *wp;
int n, len;
u_char olauth;
char line[LINE_LEN];
char filename[200];
int linenum;
int argc;
char **argv;
int allowcmd;
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if (*file == '/')
snprintf(filename, sizeof filename, "%s", file);
else
snprintf(filename, sizeof filename, "%s/%s", _PATH_PPP, file);
fp = ID0fopen(filename, "r");
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if (fp == NULL) {
LogPrintf(LogDEBUG, "ReadSystem: Can't open %s.\n", filename);
return (-1);
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}
LogPrintf(LogDEBUG, "ReadSystem: Checking %s (%s).\n", name, filename);
linenum = 0;
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while (fgets(line, sizeof(line), fp)) {
linenum++;
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cp = line;
switch (*cp) {
case '#': /* comment */
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break;
case ' ':
case '\t':
break;
default:
wp = strpbrk(cp, ":\n");
if (wp == NULL) {
LogPrintf(LogWARN, "Bad rule in %s (line %d) - missing colon.\n",
filename, linenum);
ServerClose();
exit(1);
}
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*wp = '\0';
if (*cp == '!') {
char arg[LINE_LEN];
switch (DecodeCtrlCommand(cp+1, arg)) {
case CTRL_INCLUDE:
LogPrintf(LogCOMMAND, "%s: Including \"%s\"\n", filename, arg);
n = ReadSystem(name, arg, doexec);
LogPrintf(LogCOMMAND, "%s: Done include of \"%s\"\n", filename, arg);
if (!n)
return 0; /* got it */
break;
default:
LogPrintf(LogCOMMAND, "%s: %s: Invalid command\n", name, cp);
break;
}
} else if (strcmp(cp, name) == 0) {
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while (fgets(line, sizeof(line), fp)) {
cp = line;
if (issep(*cp)) {
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n = strspn(cp, " \t");
cp += n;
len = strlen(cp);
if (!len)
continue;
if (cp[len-1] == '\n')
cp[--len] = '\0';
if (!len)
continue;
InterpretCommand(cp, len, &argc, &argv);
allowcmd = argc > 0 && !strcasecmp(*argv, "allow");
if ((!doexec && allowcmd) || (doexec && !allowcmd)) {
olauth = VarLocalAuth;
if (VarLocalAuth == LOCAL_NO_AUTH)
VarLocalAuth = LOCAL_AUTH;
RunCommand(argc, argv, name);
VarLocalAuth = olauth;
}
} else if (*cp == '#' || *cp == '\n' || *cp == '\0') {
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continue;
} else
break;
}
fclose(fp);
return (0);
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}
break;
}
}
fclose(fp);
return -1;
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}
int
ValidSystem(const char *name)
{
if (ID0realuid() == 0)
return userok = modeok = 1;
userok = 0;
modeok = 1;
ReadSystem("default", CONFFILE, 0);
if (name != NULL)
ReadSystem(name, CONFFILE, 0);
return userok && modeok;
}
int
SelectSystem(const char *name, const char *file)
{
userok = modeok = 1;
return ReadSystem(name, file, 1);
}
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int
LoadCommand(struct cmdtab const * list, int argc, char **argv)
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{
char *name;
if (argc > 0)
name = *argv;
else
name = "default";
if (!ValidSystem(name)) {
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LogPrintf(LogERROR, "%s: Label not allowed\n", name);
return 1;
} else if (SelectSystem(name, CONFFILE) < 0) {
LogPrintf(LogWARN, "%s: not found.\n", name);
return -1;
} else
SetLabel(argc ? name : NULL);
return 0;
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}
int
SaveCommand(struct cmdtab const *list, int argc, char **argv)
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{
LogPrintf(LogWARN, "save command is not implemented (yet).\n");
return 1;
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}