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 #ifndef lint 32 #if 0 33 static char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro"; 34 #endif 35 #endif 36 37 /* 38 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 39 */ 40 41 /* 42 * Administrative tool to add a new user to the publickey database 43 */ 44 #include <sys/cdefs.h> 45 #include <sys/types.h> 46 #include <sys/time.h> 47 #include <sys/resource.h> 48 49 #include <rpc/rpc.h> 50 #include <rpc/key_prot.h> 51 52 #ifdef YP 53 #include <sys/wait.h> 54 #include <rpcsvc/yp_prot.h> 55 #include <rpcsvc/ypclnt.h> 56 #include <netdb.h> 57 #endif /* YP */ 58 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "extern.h" 66 67 #ifdef YP 68 static char SHELL[] = "/bin/sh"; 69 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 70 static char UPDATEFILE[] = "updaters"; 71 72 static int _openchild(char *, FILE **, FILE **); 73 static char *basename(char *path); 74 75 /* 76 * Determine if requester is allowed to update the given map, 77 * and update it if so. Returns the yp status, which is zero 78 * if there is no access violation. 79 */ 80 int 81 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, 82 char *key, u_int datalen, char *data) 83 { 84 char updater[MAXMAPNAMELEN + 40]; 85 FILE *childargs; 86 FILE *childrslt; 87 #ifdef WEXITSTATUS 88 int status; 89 #else 90 union wait status; 91 #endif 92 pid_t pid; 93 u_int yperrno; 94 95 96 #ifdef DEBUG 97 printf("%s %s\n", key, data); 98 #endif 99 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 100 UPDATEFILE, mapname); 101 pid = _openchild(updater, &childargs, &childrslt); 102 if (pid < 0) { 103 return (YPERR_YPERR); 104 } 105 106 /* 107 * Write to child 108 */ 109 (void)fprintf(childargs, "%s\n", requester); 110 (void)fprintf(childargs, "%u\n", op); 111 (void)fprintf(childargs, "%u\n", keylen); 112 (void)fwrite(key, (int)keylen, 1, childargs); 113 (void)fprintf(childargs, "\n"); 114 (void)fprintf(childargs, "%u\n", datalen); 115 (void)fwrite(data, (int)datalen, 1, childargs); 116 (void)fprintf(childargs, "\n"); 117 (void)fclose(childargs); 118 119 /* 120 * Read from child 121 */ 122 (void)fscanf(childrslt, "%d", &yperrno); 123 (void)fclose(childrslt); 124 125 (void)wait(&status); 126 #ifdef WEXITSTATUS 127 if (WEXITSTATUS(status) != 0) { 128 #else 129 if (status.w_retcode != 0) { 130 #endif 131 return (YPERR_YPERR); 132 } 133 return (yperrno); 134 } 135 136 /* 137 * returns pid, or -1 for failure 138 */ 139 static pid_t 140 _openchild(char *command, FILE **fto, FILE **ffrom) 141 { 142 int i; 143 pid_t pid; 144 int pdto[2]; 145 int pdfrom[2]; 146 char *com; 147 struct rlimit rl; 148 149 if (pipe(pdto) < 0) { 150 goto error1; 151 } 152 if (pipe(pdfrom) < 0) { 153 goto error2; 154 } 155 switch (pid = fork()) { 156 case -1: 157 goto error3; 158 159 case 0: 160 /* 161 * child: read from pdto[0], write into pdfrom[1] 162 */ 163 (void)close(0); 164 (void)dup(pdto[0]); 165 (void)close(1); 166 (void)dup(pdfrom[1]); 167 getrlimit(RLIMIT_NOFILE, &rl); 168 for (i = rl.rlim_max - 1; i >= 3; i--) { 169 (void) close(i); 170 } 171 com = malloc((unsigned) strlen(command) + 6); 172 if (com == NULL) { 173 _exit(~0); 174 } 175 (void)sprintf(com, "exec %s", command); 176 execl(SHELL, basename(SHELL), "-c", com, (char *)NULL); 177 _exit(~0); 178 179 default: 180 /* 181 * parent: write into pdto[1], read from pdfrom[0] 182 */ 183 *fto = fdopen(pdto[1], "w"); 184 (void)close(pdto[0]); 185 *ffrom = fdopen(pdfrom[0], "r"); 186 (void)close(pdfrom[1]); 187 break; 188 } 189 return (pid); 190 191 /* 192 * error cleanup and return 193 */ 194 error3: 195 (void)close(pdfrom[0]); 196 (void)close(pdfrom[1]); 197 error2: 198 (void)close(pdto[0]); 199 (void)close(pdto[1]); 200 error1: 201 return (-1); 202 } 203 204 static char * 205 basename(char *path) 206 { 207 char *p; 208 209 p = strrchr(path, '/'); 210 if (p == NULL) { 211 return (path); 212 } else { 213 return (p + 1); 214 } 215 } 216 217 #else /* YP */ 218 219 #define ERR_ACCESS 1 220 #define ERR_MALLOC 2 221 #define ERR_READ 3 222 #define ERR_WRITE 4 223 #define ERR_DBASE 5 224 #define ERR_KEY 6 225 226 static int match(char *, char *); 227 228 /* 229 * Determine if requester is allowed to update the given map, 230 * and update it if so. Returns the status, which is zero 231 * if there is no access violation. This function updates 232 * the local file and then shuts up. 233 */ 234 int 235 localupdate(char *name, char *filename, u_int op, u_int keylen __unused, 236 char *key, u_int datalen __unused, char *data) 237 { 238 char line[256]; 239 FILE *rf; 240 FILE *wf; 241 char *tmpname; 242 int err; 243 244 /* 245 * Check permission 246 */ 247 if (strcmp(name, key) != 0) { 248 return (ERR_ACCESS); 249 } 250 if (strcmp(name, "nobody") == 0) { 251 /* 252 * Can't change "nobody"s key. 253 */ 254 return (ERR_ACCESS); 255 } 256 257 /* 258 * Open files 259 */ 260 tmpname = malloc(strlen(filename) + 4); 261 if (tmpname == NULL) { 262 return (ERR_MALLOC); 263 } 264 sprintf(tmpname, "%s.tmp", filename); 265 rf = fopen(filename, "r"); 266 if (rf == NULL) { 267 err = ERR_READ; 268 goto cleanup; 269 } 270 wf = fopen(tmpname, "w"); 271 if (wf == NULL) { 272 fclose(rf); 273 err = ERR_WRITE; 274 goto cleanup; 275 } 276 err = -1; 277 while (fgets(line, sizeof (line), rf)) { 278 if (err < 0 && match(line, name)) { 279 switch (op) { 280 case YPOP_INSERT: 281 err = ERR_KEY; 282 break; 283 case YPOP_STORE: 284 case YPOP_CHANGE: 285 fprintf(wf, "%s %s\n", key, data); 286 err = 0; 287 break; 288 case YPOP_DELETE: 289 /* do nothing */ 290 err = 0; 291 break; 292 } 293 } else { 294 fputs(line, wf); 295 } 296 } 297 if (err < 0) { 298 switch (op) { 299 case YPOP_CHANGE: 300 case YPOP_DELETE: 301 err = ERR_KEY; 302 break; 303 case YPOP_INSERT: 304 case YPOP_STORE: 305 err = 0; 306 fprintf(wf, "%s %s\n", key, data); 307 break; 308 } 309 } 310 fclose(wf); 311 fclose(rf); 312 if (err == 0) { 313 if (rename(tmpname, filename) < 0) { 314 err = ERR_DBASE; 315 goto cleanup; 316 } 317 } else { 318 if (unlink(tmpname) < 0) { 319 err = ERR_DBASE; 320 goto cleanup; 321 } 322 } 323 324 cleanup: 325 free(tmpname); 326 return (err); 327 } 328 329 static int 330 match(char *line, char *name) 331 { 332 int len; 333 334 len = strlen(name); 335 return (strncmp(line, name, len) == 0 && 336 (line[len] == ' ' || line[len] == '\t')); 337 } 338 #endif /* !YP */ 339