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Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.
[FreeBSD/releng/7.2.git] / lib / libc / rpc / netnamer.c
1 /*
2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3  * unrestricted use provided that this legend is included on all tape
4  * media and as a part of the software program in whole or part.  Users
5  * may copy or modify Sun RPC without charge, but are not authorized
6  * to license or distribute it to anyone else except as part of a product or
7  * program developed by the user or with the express written consent of
8  * Sun Microsystems, Inc.
9  *
10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13  *
14  * Sun RPC is provided with no support and without any obligation on the
15  * part of Sun Microsystems, Inc. to assist in its use, correction,
16  * modification or enhancement.
17  *
18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20  * OR ANY PART THEREOF.
21  *
22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23  * or profits or other special, indirect and consequential damages, even if
24  * Sun has been advised of the possibility of such damages.
25  *
26  * Sun Microsystems, Inc.
27  * 2550 Garcia Avenue
28  * Mountain View, California  94043
29  */
30
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char sccsid[] = "@(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro";
33 #endif
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 /*
38  * netname utility routines convert from unix names to network names and
39  * vice-versa This module is operating system dependent! What we define here
40  * will work with any unix system that has adopted the sun NIS domain
41  * architecture.
42  */
43 #include "namespace.h"
44 #include <sys/param.h>
45 #include <rpc/rpc.h>
46 #include <rpc/rpc_com.h>
47 #ifdef YP
48 #include <rpcsvc/yp_prot.h>
49 #include <rpcsvc/ypclnt.h>
50 #endif
51 #include <ctype.h>
52 #include <stdio.h>
53 #include <grp.h>
54 #include <pwd.h>
55 #include <string.h>
56 #include <stdlib.h>
57 #include <unistd.h>
58 #include "un-namespace.h"
59
60 static char    *OPSYS = "unix";
61 #ifdef YP
62 static char    *NETID = "netid.byname";
63 #endif
64 static char    *NETIDFILE = "/etc/netid";
65
66 static int getnetid( char *, char * );
67 static int _getgroups( char *, gid_t * );
68
69 #ifndef NGROUPS
70 #define NGROUPS 16
71 #endif
72
73 /*
74  * Convert network-name into unix credential
75  */
76 int
77 netname2user(netname, uidp, gidp, gidlenp, gidlist)
78         char            netname[MAXNETNAMELEN + 1];
79         uid_t            *uidp;
80         gid_t            *gidp;
81         int            *gidlenp;
82         gid_t          *gidlist;
83 {
84         char           *p;
85         int             gidlen;
86         uid_t           uid;
87         long            luid;
88         struct passwd  *pwd;
89         char            val[1024];
90         char           *val1, *val2;
91         char           *domain;
92         int             vallen;
93         int             err;
94
95         if (getnetid(netname, val)) {
96                 char *res = val;
97
98                 p = strsep(&res, ":");
99                 if (p == NULL)
100                         return (0);
101                 *uidp = (uid_t) atol(p);
102                 p = strsep(&res, "\n,");
103                 if (p == NULL) {
104                         return (0);
105                 }
106                 *gidp = (gid_t) atol(p);
107                 for (gidlen = 0; gidlen < NGROUPS; gidlen++) {
108                         p = strsep(&res, "\n,");
109                         if (p == NULL)
110                                 break;
111                         gidlist[gidlen] = (gid_t) atol(p);
112                 }
113                 *gidlenp = gidlen;
114
115                 return (1);
116         }
117         val1 = strchr(netname, '.');
118         if (val1 == NULL)
119                 return (0);
120         if (strncmp(netname, OPSYS, (val1-netname)))
121                 return (0);
122         val1++;
123         val2 = strchr(val1, '@');
124         if (val2 == NULL)
125                 return (0);
126         vallen = val2 - val1;
127         if (vallen > (1024 - 1))
128                 vallen = 1024 - 1;
129         (void) strncpy(val, val1, 1024);
130         val[vallen] = 0;
131
132         err = __rpc_get_default_domain(&domain);        /* change to rpc */
133         if (err)
134                 return (0);
135
136         if (strcmp(val2 + 1, domain))
137                 return (0);     /* wrong domain */
138
139         if (sscanf(val, "%ld", &luid) != 1)
140                 return (0);
141         uid = luid;
142
143         /* use initgroups method */
144         pwd = getpwuid(uid);
145         if (pwd == NULL)
146                 return (0);
147         *uidp = pwd->pw_uid;
148         *gidp = pwd->pw_gid;
149         *gidlenp = _getgroups(pwd->pw_name, gidlist);
150         return (1);
151 }
152
153 /*
154  * initgroups
155  */
156
157 static int
158 _getgroups(uname, groups)
159         char           *uname;
160         gid_t          groups[NGROUPS];
161 {
162         gid_t           ngroups = 0;
163         struct group *grp;
164         int    i;
165         int    j;
166         int             filter;
167
168         setgrent();
169         while ((grp = getgrent())) {
170                 for (i = 0; grp->gr_mem[i]; i++)
171                         if (!strcmp(grp->gr_mem[i], uname)) {
172                                 if (ngroups == NGROUPS) {
173 #ifdef DEBUG
174                                         fprintf(stderr,
175                                 "initgroups: %s is in too many groups\n", uname);
176 #endif
177                                         goto toomany;
178                                 }
179                                 /* filter out duplicate group entries */
180                                 filter = 0;
181                                 for (j = 0; j < ngroups; j++)
182                                         if (groups[j] == grp->gr_gid) {
183                                                 filter++;
184                                                 break;
185                                         }
186                                 if (!filter)
187                                         groups[ngroups++] = grp->gr_gid;
188                         }
189         }
190 toomany:
191         endgrent();
192         return (ngroups);
193 }
194
195 /*
196  * Convert network-name to hostname
197  */
198 int
199 netname2host(netname, hostname, hostlen)
200         char            netname[MAXNETNAMELEN + 1];
201         char           *hostname;
202         int             hostlen;
203 {
204         int             err;
205         char            valbuf[1024];
206         char           *val;
207         char           *val2;
208         int             vallen;
209         char           *domain;
210
211         if (getnetid(netname, valbuf)) {
212                 val = valbuf;
213                 if ((*val == '0') && (val[1] == ':')) {
214                         (void) strncpy(hostname, val + 2, hostlen);
215                         return (1);
216                 }
217         }
218         val = strchr(netname, '.');
219         if (val == NULL)
220                 return (0);
221         if (strncmp(netname, OPSYS, (val - netname)))
222                 return (0);
223         val++;
224         val2 = strchr(val, '@');
225         if (val2 == NULL)
226                 return (0);
227         vallen = val2 - val;
228         if (vallen > (hostlen - 1))
229                 vallen = hostlen - 1;
230         (void) strncpy(hostname, val, vallen);
231         hostname[vallen] = 0;
232
233         err = __rpc_get_default_domain(&domain);        /* change to rpc */
234         if (err)
235                 return (0);
236
237         if (strcmp(val2 + 1, domain))
238                 return (0);     /* wrong domain */
239         else
240                 return (1);
241 }
242
243 /*
244  * reads the file /etc/netid looking for a + to optionally go to the
245  * network information service.
246  */
247 int
248 getnetid(key, ret)
249         char           *key, *ret;
250 {
251         char            buf[1024];      /* big enough */
252         char           *res;
253         char           *mkey;
254         char           *mval;
255         FILE           *fd;
256 #ifdef YP
257         char           *domain;
258         int             err;
259         char           *lookup;
260         int             len;
261 #endif
262
263         fd = fopen(NETIDFILE, "r");
264         if (fd == NULL) {
265 #ifdef YP
266                 res = "+";
267                 goto getnetidyp;
268 #else
269                 return (0);
270 #endif
271         }
272         for (;;) {
273                 if (fd == NULL)
274                         return (0);     /* getnetidyp brings us here */
275                 res = fgets(buf, sizeof(buf), fd);
276                 if (res == NULL) {
277                         fclose(fd);
278                         return (0);
279                 }
280                 if (res[0] == '#')
281                         continue;
282                 else if (res[0] == '+') {
283 #ifdef YP
284         getnetidyp:
285                         err = yp_get_default_domain(&domain);
286                         if (err) {
287                                 continue;
288                         }
289                         lookup = NULL;
290                         err = yp_match(domain, NETID, key,
291                                 strlen(key), &lookup, &len);
292                         if (err) {
293 #ifdef DEBUG
294                                 fprintf(stderr, "match failed error %d\n", err);
295 #endif
296                                 continue;
297                         }
298                         lookup[len] = 0;
299                         strcpy(ret, lookup);
300                         free(lookup);
301                         if (fd != NULL)
302                                 fclose(fd);
303                         return (2);
304 #else   /* YP */
305 #ifdef DEBUG
306                         fprintf(stderr,
307 "Bad record in %s '+' -- NIS not supported in this library copy\n",
308                                 NETIDFILE);
309 #endif
310                         continue;
311 #endif  /* YP */
312                 } else {
313                         mkey = strsep(&res, "\t ");
314                         if (mkey == NULL) {
315                                 fprintf(stderr,
316                 "Bad record in %s -- %s", NETIDFILE, buf);
317                                 continue;
318                         }
319                         do {
320                                 mval = strsep(&res, " \t#\n");
321                         } while (mval != NULL && !*mval);
322                         if (mval == NULL) {
323                                 fprintf(stderr,
324                 "Bad record in %s val problem - %s", NETIDFILE, buf);
325                                 continue;
326                         }
327                         if (strcmp(mkey, key) == 0) {
328                                 strcpy(ret, mval);
329                                 fclose(fd);
330                                 return (1);
331
332                         }
333                 }
334         }
335 }