systems.c revision 6111 
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 1.1.1.1 1995/01/31 06:29:55 amurai Exp $
21 *
22 *  TODO:
23 */
24#include "fsm.h"
25#include "vars.h"
26#include "ipcp.h"
27#include "pathnames.h"
28
29extern void DecodeCommand();
30
31static int uid, gid;
32static int euid, egid;
33static int usermode;
34
35void
36GetUid()
37{
38  uid = getuid();
39  gid = getgid();
40  euid = geteuid();
41  egid = getegid();
42  usermode = 0;
43}
44
45static void
46SetUserId()
47{
48  if (!usermode) {
49#ifdef __FreeBSD__
50    setruid(euid);
51    seteuid(uid);
52    setrgid(egid);
53    setegid(gid);
54#else
55    setreuid(euid, uid);
56    setregid(egid, gid);
57#endif
58    usermode = 1;
59  }
60}
61
62static void
63SetPppId()
64{
65  if (usermode) {
66#ifdef __FreeBSD__
67    setruid(uid);
68    seteuid(euid);
69    setrgid(gid);
70    setegid(egid);
71#else
72    setreuid(uid, euid);
73    setregid(gid, egid);
74#endif
75    usermode = 0;
76  }
77}
78
79FILE *
80OpenSecret(file)
81char *file;
82{
83  FILE *fp;
84  char *cp;
85  char line[100];
86
87  fp = NULL;
88  cp = getenv("HOME");
89  if (cp) {
90    SetUserId();
91    sprintf(line, "%s/.%s", cp, file);
92    fp = fopen(line, "r");
93  }
94  if (fp == NULL) {
95    SetPppId();
96    sprintf(line, "%s/%s", _PATH_PPP, file);
97    fp = fopen(line, "r");
98  }
99  if (fp == NULL) {
100    fprintf(stderr, "can't open %s.\n", line);
101    SetPppId();
102    return(NULL);
103  }
104  return(fp);
105}
106
107void
108CloseSecret(fp)
109FILE *fp;
110{
111  fclose(fp);
112  SetPppId();
113}
114
115int
116SelectSystem(name, file)
117char *name;
118char *file;
119{
120  FILE *fp;
121  char *cp, *wp;
122  int n;
123  int val = -1;
124  char line[200];
125
126  fp = NULL;
127  cp = getenv("HOME");
128  if (cp) {
129    SetUserId();
130    sprintf(line, "%s/.%s", cp, file);
131    fp = fopen(line, "r");
132  }
133  if (fp == NULL) {
134    SetPppId();		/* fix from pdp@ark.jr3uom.iijnet.or.jp */
135    sprintf(line, "%s/%s", _PATH_PPP, file);
136    fp = fopen(line, "r");
137  }
138  if (fp == NULL) {
139    fprintf(stderr, "can't open %s.\n", line);
140    SetPppId();
141    return(-1);
142  }
143#ifdef DEBUG
144  fprintf(stderr, "checking %s (%s).\n", name, line);
145#endif
146  while (fgets(line, sizeof(line), fp)) {
147    cp = line;
148    switch (*cp) {
149    case '#':		/* comment */
150      break;
151    case ' ':
152    case '\t':
153      break;
154    default:
155      wp = strpbrk(cp, ":\n");
156      *wp = '\0';
157      if (strcmp(cp, name) == 0) {
158	while (fgets(line, sizeof(line), fp)) {
159	  cp = line;
160	  if (*cp == ' ' || *cp == '\t') {
161	    n = strspn(cp, " \t");
162	    cp += n;
163#ifdef DEBUG
164	    fprintf(stderr, "%s", cp);
165#endif
166	    SetPppId();
167	    DecodeCommand(cp, strlen(cp), 0);
168	    SetUserId();
169	  } else if (*cp == '#') {
170	    continue;
171	  } else
172	    break;
173	}
174	fclose(fp);
175	SetPppId();
176	return(0);
177      }
178      break;
179    }
180  }
181  fclose(fp);
182  SetPppId();
183  return(val);
184}
185
186int
187LoadCommand(list, argc, argv)
188struct cmdtab *list;
189int argc;
190char **argv;
191{
192  char *name;
193
194  if (argc > 0)
195    name = *argv;
196  else
197    name = "default";
198
199  if (SelectSystem(name, CONFFILE) < 0) {
200    printf("%s: not found.\n", name);
201    return(-1);
202  }
203  return(1);
204}
205
206extern struct in_addr ifnetmask;
207
208int
209SaveCommand(list, argc, argv)
210struct cmdtab *list;
211int argc;
212char **argv;
213{
214  printf("save command is not implemented (yet).\n");
215  return(1);
216}
217