systems.c revision 29083 
1/*
2 *	          System configuration routines
3 *
4 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
5 *
6 *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the Internet Initiative Japan, Inc.  The name of the
14 * IIJ may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * $Id: systems.c,v 1.15 1997/08/31 22:59:49 brian Exp $
21 *
22 *  TODO:
23 */
24#include "fsm.h"
25#include "loadalias.h"
26#include "vars.h"
27#include "ipcp.h"
28#include "pathnames.h"
29#include "vars.h"
30#include "server.h"
31#include "command.h"
32
33extern void DecodeCommand();
34
35static int uid, gid;
36static int euid, egid;
37static int usermode;
38
39int
40OrigUid()
41{
42  return uid;
43}
44
45void
46GetUid()
47{
48  uid = getuid();
49  gid = getgid();
50  euid = geteuid();
51  egid = getegid();
52  usermode = 0;
53}
54
55static void
56SetUserId()
57{
58  if (!usermode) {
59    if (setreuid(euid, uid) == -1) {
60      LogPrintf(LogERROR, "unable to setreuid!\n");
61      ServerClose();
62      exit(1);
63    }
64    if (setregid(egid, gid) == -1) {
65      LogPrintf(LogERROR, "unable to setregid!\n");
66      ServerClose();
67      exit(1);
68    }
69    usermode = 1;
70  }
71}
72
73static void
74SetPppId()
75{
76  if (usermode) {
77    if (setreuid(uid, euid) == -1) {
78      LogPrintf(LogERROR, "unable to setreuid!\n");
79      ServerClose();
80      exit(1);
81    }
82    if (setregid(gid, egid) == -1) {
83      LogPrintf(LogERROR, "unable to setregid!\n");
84      ServerClose();
85      exit(1);
86    }
87    usermode = 0;
88  }
89}
90
91FILE *
92OpenSecret(char *file)
93{
94  FILE *fp;
95  char *cp;
96  char line[100];
97
98  fp = NULL;
99  cp = getenv("HOME");
100  if (cp) {
101    SetUserId();
102    snprintf(line, sizeof line, "%s/.%s", cp, file);
103    fp = fopen(line, "r");
104  }
105  if (fp == NULL) {
106    SetPppId();
107    snprintf(line, sizeof line, "%s/%s", _PATH_PPP, file);
108    fp = fopen(line, "r");
109  }
110  if (fp == NULL) {
111    LogPrintf(LogWARN, "OpenSecret: Can't open %s.\n", line);
112    SetPppId();
113    return (NULL);
114  }
115  return (fp);
116}
117
118void
119CloseSecret(FILE * fp)
120{
121  fclose(fp);
122  SetPppId();
123}
124
125int
126SelectSystem(char *name, char *file)
127{
128  FILE *fp;
129  char *cp, *wp;
130  int n;
131  u_char olauth;
132  char line[200];
133  char filename[200];
134  int linenum;
135
136  fp = NULL;
137  cp = getenv("HOME");
138  if (cp) {
139    SetUserId();
140    snprintf(filename, sizeof filename, "%s/.%s", cp, file);
141    fp = fopen(filename, "r");
142  }
143  if (fp == NULL) {
144    SetPppId();			/* fix from pdp@ark.jr3uom.iijnet.or.jp */
145    snprintf(filename, sizeof filename, "%s/%s", _PATH_PPP, file);
146    fp = fopen(filename, "r");
147  }
148  if (fp == NULL) {
149    LogPrintf(LogDEBUG, "SelectSystem: Can't open %s.\n", filename);
150    SetPppId();
151    return (-1);
152  }
153  LogPrintf(LogDEBUG, "SelectSystem: Checking %s (%s).\n", name, filename);
154
155  linenum = 0;
156  while (fgets(line, sizeof(line), fp)) {
157    linenum++;
158    cp = line;
159    switch (*cp) {
160    case '#':			/* comment */
161      break;
162    case ' ':
163    case '\t':
164      break;
165    default:
166      wp = strpbrk(cp, ":\n");
167      if (wp == NULL) {
168	LogPrintf(LogWARN, "Bad rule in %s (line %d) - missing colon.\n",
169		  filename, linenum);
170	ServerClose();
171	exit(1);
172      }
173      *wp = '\0';
174      if (strcmp(cp, name) == 0) {
175	while (fgets(line, sizeof(line), fp)) {
176	  cp = line;
177	  if (*cp == ' ' || *cp == '\t') {
178	    n = strspn(cp, " \t");
179	    cp += n;
180	    LogPrintf(LogCOMMAND, "%s: %s\n", name, cp);
181	    SetPppId();
182	    olauth = VarLocalAuth;
183	    if (VarLocalAuth == LOCAL_NO_AUTH)
184	      VarLocalAuth = LOCAL_AUTH;
185	    DecodeCommand(cp, strlen(cp), 0);
186	    VarLocalAuth = olauth;
187	    SetUserId();
188	  } else if (*cp == '#') {
189	    continue;
190	  } else
191	    break;
192	}
193	fclose(fp);
194	SetPppId();
195	return (0);
196      }
197      break;
198    }
199  }
200  fclose(fp);
201  SetPppId();
202  return -1;
203}
204
205int
206LoadCommand(struct cmdtab const * list, int argc, char **argv)
207{
208  char *name;
209
210  if (argc > 0)
211    name = *argv;
212  else
213    name = "default";
214
215  if (SelectSystem(name, CONFFILE) < 0) {
216    LogPrintf(LogWARN, "%s: not found.\n", name);
217    return -1;
218  }
219  return 0;
220}
221
222int
223SaveCommand(struct cmdtab const * list, int argc, char **argv)
224{
225  LogPrintf(LogWARN, "save command is not implemented (yet).\n");
226  return 1;
227}
228