1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate * 26*0Sstevel@tonic-gate * Common code and structures used by name-service-switch "user" backends. 27*0Sstevel@tonic-gate * Much of this was taken directly from the files_common.c source. 28*0Sstevel@tonic-gate */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate /* 33*0Sstevel@tonic-gate * An implementation that used mmap() sensibly would be a wonderful thing, 34*0Sstevel@tonic-gate * but this here is just yer standard fgets() thang. 35*0Sstevel@tonic-gate */ 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #include <stdio.h> 38*0Sstevel@tonic-gate #include <stdlib.h> 39*0Sstevel@tonic-gate #include <ctype.h> 40*0Sstevel@tonic-gate #include <fcntl.h> 41*0Sstevel@tonic-gate #include <poll.h> 42*0Sstevel@tonic-gate #include <unistd.h> 43*0Sstevel@tonic-gate #include "user_common.h" 44*0Sstevel@tonic-gate #include <sys/stat.h> 45*0Sstevel@tonic-gate #include "../../../libnsl/include/nsl_stdio_prv.h" 46*0Sstevel@tonic-gate #include <string.h> 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate nss_status_t 49*0Sstevel@tonic-gate _nss_user_setent(be, dummy) 50*0Sstevel@tonic-gate user_backend_ptr_t be; 51*0Sstevel@tonic-gate void *dummy; 52*0Sstevel@tonic-gate { 53*0Sstevel@tonic-gate if (be->f == 0) { 54*0Sstevel@tonic-gate if (be->filename == 0) { 55*0Sstevel@tonic-gate /* Backend isn't initialized properly? */ 56*0Sstevel@tonic-gate return (NSS_UNAVAIL); 57*0Sstevel@tonic-gate } 58*0Sstevel@tonic-gate if ((be->f = __nsl_fopen(be->filename, "r")) == 0) { 59*0Sstevel@tonic-gate return (NSS_UNAVAIL); 60*0Sstevel@tonic-gate } 61*0Sstevel@tonic-gate } else { 62*0Sstevel@tonic-gate __nsl_rewind(be->f); 63*0Sstevel@tonic-gate } 64*0Sstevel@tonic-gate return (NSS_SUCCESS); 65*0Sstevel@tonic-gate } 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate nss_status_t 68*0Sstevel@tonic-gate _nss_user_endent(be, dummy) 69*0Sstevel@tonic-gate user_backend_ptr_t be; 70*0Sstevel@tonic-gate void *dummy; 71*0Sstevel@tonic-gate { 72*0Sstevel@tonic-gate if (be->f != 0) { 73*0Sstevel@tonic-gate __nsl_fclose(be->f); 74*0Sstevel@tonic-gate be->f = 0; 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate if (be->buf != 0) { 77*0Sstevel@tonic-gate free(be->buf); 78*0Sstevel@tonic-gate be->buf = 0; 79*0Sstevel@tonic-gate } 80*0Sstevel@tonic-gate return (NSS_SUCCESS); 81*0Sstevel@tonic-gate } 82*0Sstevel@tonic-gate 83*0Sstevel@tonic-gate /* 84*0Sstevel@tonic-gate * This routine reads a line, including the processing of continuation 85*0Sstevel@tonic-gate * characters. It always leaves (or inserts) \n\0 at the end of the line. 86*0Sstevel@tonic-gate * It returns the length of the line read, excluding the \n\0. Who's idea 87*0Sstevel@tonic-gate * was this? 88*0Sstevel@tonic-gate * Returns -1 on EOF. 89*0Sstevel@tonic-gate * 90*0Sstevel@tonic-gate * Note that since each concurrent call to _nss_user_read_line has 91*0Sstevel@tonic-gate * it's own FILE pointer, we can use getc_unlocked w/o difficulties, 92*0Sstevel@tonic-gate * a substantial performance win. 93*0Sstevel@tonic-gate */ 94*0Sstevel@tonic-gate int 95*0Sstevel@tonic-gate _nss_user_read_line(f, buffer, buflen) 96*0Sstevel@tonic-gate __NSL_FILE *f; 97*0Sstevel@tonic-gate char *buffer; 98*0Sstevel@tonic-gate int buflen; 99*0Sstevel@tonic-gate { 100*0Sstevel@tonic-gate int linelen; /* 1st unused slot in buffer */ 101*0Sstevel@tonic-gate int c; 102*0Sstevel@tonic-gate 103*0Sstevel@tonic-gate while (1) { 104*0Sstevel@tonic-gate linelen = 0; 105*0Sstevel@tonic-gate while (linelen < buflen - 1) { /* "- 1" saves room for \n\0 */ 106*0Sstevel@tonic-gate switch (c = __nsl_getc_unlocked(f)) { 107*0Sstevel@tonic-gate case EOF: 108*0Sstevel@tonic-gate if (linelen == 0 || 109*0Sstevel@tonic-gate buffer[linelen - 1] == '\\') { 110*0Sstevel@tonic-gate return (-1); 111*0Sstevel@tonic-gate } else { 112*0Sstevel@tonic-gate buffer[linelen ] = '\n'; 113*0Sstevel@tonic-gate buffer[linelen + 1] = '\0'; 114*0Sstevel@tonic-gate return (linelen); 115*0Sstevel@tonic-gate } 116*0Sstevel@tonic-gate case '\n': 117*0Sstevel@tonic-gate if (linelen > 0 && 118*0Sstevel@tonic-gate buffer[linelen - 1] == '\\') { 119*0Sstevel@tonic-gate --linelen; /* remove the '\\' */ 120*0Sstevel@tonic-gate } else { 121*0Sstevel@tonic-gate buffer[linelen ] = '\n'; 122*0Sstevel@tonic-gate buffer[linelen + 1] = '\0'; 123*0Sstevel@tonic-gate return (linelen); 124*0Sstevel@tonic-gate } 125*0Sstevel@tonic-gate break; 126*0Sstevel@tonic-gate default: 127*0Sstevel@tonic-gate buffer[linelen++] = c; 128*0Sstevel@tonic-gate } 129*0Sstevel@tonic-gate } 130*0Sstevel@tonic-gate /* Buffer overflow -- eat rest of line and loop again */ 131*0Sstevel@tonic-gate /* ===> Should syslog() */ 132*0Sstevel@tonic-gate do { 133*0Sstevel@tonic-gate c = __nsl_getc_unlocked(f); 134*0Sstevel@tonic-gate if (c == EOF) { 135*0Sstevel@tonic-gate return (-1); 136*0Sstevel@tonic-gate } 137*0Sstevel@tonic-gate } while (c != '\n'); 138*0Sstevel@tonic-gate } 139*0Sstevel@tonic-gate /*NOTREACHED*/ 140*0Sstevel@tonic-gate } 141*0Sstevel@tonic-gate 142*0Sstevel@tonic-gate 143*0Sstevel@tonic-gate /* 144*0Sstevel@tonic-gate * Could implement this as an iterator function on top of _nss_user_do_all(), 145*0Sstevel@tonic-gate * but the shared code is small enough that it'd be pretty silly. 146*0Sstevel@tonic-gate */ 147*0Sstevel@tonic-gate nss_status_t 148*0Sstevel@tonic-gate _nss_user_XY_all(be, args, netdb, filter, check) 149*0Sstevel@tonic-gate user_backend_ptr_t be; 150*0Sstevel@tonic-gate nss_XbyY_args_t *args; 151*0Sstevel@tonic-gate int netdb; /* whether it uses netdb */ 152*0Sstevel@tonic-gate /* format or not */ 153*0Sstevel@tonic-gate const char *filter; /* advisory, to speed up */ 154*0Sstevel@tonic-gate /* string search */ 155*0Sstevel@tonic-gate user_XY_check_func check; /* NULL means one-shot, for getXXent */ 156*0Sstevel@tonic-gate { 157*0Sstevel@tonic-gate nss_status_t res; 158*0Sstevel@tonic-gate int parsestat; 159*0Sstevel@tonic-gate 160*0Sstevel@tonic-gate if (be->buf == 0 && 161*0Sstevel@tonic-gate (be->buf = malloc(be->minbuf)) == 0) { 162*0Sstevel@tonic-gate return (NSS_UNAVAIL); /* really panic, malloc failed */ 163*0Sstevel@tonic-gate } 164*0Sstevel@tonic-gate 165*0Sstevel@tonic-gate if (check != 0 || be->f == 0) { 166*0Sstevel@tonic-gate if ((res = _nss_user_setent(be, 0)) != NSS_SUCCESS) { 167*0Sstevel@tonic-gate return (res); 168*0Sstevel@tonic-gate } 169*0Sstevel@tonic-gate } 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate res = NSS_NOTFOUND; 172*0Sstevel@tonic-gate 173*0Sstevel@tonic-gate while (1) { 174*0Sstevel@tonic-gate char *instr = be->buf; 175*0Sstevel@tonic-gate int linelen; 176*0Sstevel@tonic-gate 177*0Sstevel@tonic-gate if ((linelen = _nss_user_read_line(be->f, instr, 178*0Sstevel@tonic-gate be->minbuf)) < 0) { 179*0Sstevel@tonic-gate /* End of file */ 180*0Sstevel@tonic-gate args->returnval = 0; 181*0Sstevel@tonic-gate args->erange = 0; 182*0Sstevel@tonic-gate break; 183*0Sstevel@tonic-gate } 184*0Sstevel@tonic-gate if (filter != 0 && strstr(instr, filter) == 0) { 185*0Sstevel@tonic-gate /* 186*0Sstevel@tonic-gate * Optimization: if the entry doesn't contain the 187*0Sstevel@tonic-gate * filter string then it can't be the entry we want, 188*0Sstevel@tonic-gate * so don't bother looking more closely at it. 189*0Sstevel@tonic-gate */ 190*0Sstevel@tonic-gate continue; 191*0Sstevel@tonic-gate } 192*0Sstevel@tonic-gate if (netdb) { 193*0Sstevel@tonic-gate char *first; 194*0Sstevel@tonic-gate char *last; 195*0Sstevel@tonic-gate 196*0Sstevel@tonic-gate if ((last = strchr(instr, '#')) == 0) { 197*0Sstevel@tonic-gate last = instr + linelen; 198*0Sstevel@tonic-gate } 199*0Sstevel@tonic-gate *last-- = '\0'; /* Nuke '\n' or #comment */ 200*0Sstevel@tonic-gate 201*0Sstevel@tonic-gate /* 202*0Sstevel@tonic-gate * Skip leading whitespace. Normally there isn't 203*0Sstevel@tonic-gate * any, so it's not worth calling strspn(). 204*0Sstevel@tonic-gate */ 205*0Sstevel@tonic-gate for (first = instr; isspace(*first); first++) { 206*0Sstevel@tonic-gate ; 207*0Sstevel@tonic-gate } 208*0Sstevel@tonic-gate if (*first == '\0') { 209*0Sstevel@tonic-gate continue; 210*0Sstevel@tonic-gate } 211*0Sstevel@tonic-gate /* 212*0Sstevel@tonic-gate * Found something non-blank on the line. Skip back 213*0Sstevel@tonic-gate * over any trailing whitespace; since we know 214*0Sstevel@tonic-gate * there's non-whitespace earlier in the line, 215*0Sstevel@tonic-gate * checking for termination is easy. 216*0Sstevel@tonic-gate */ 217*0Sstevel@tonic-gate while (isspace(*last)) { 218*0Sstevel@tonic-gate --last; 219*0Sstevel@tonic-gate } 220*0Sstevel@tonic-gate 221*0Sstevel@tonic-gate linelen = last - first + 1; 222*0Sstevel@tonic-gate if (first != instr) { 223*0Sstevel@tonic-gate instr = first; 224*0Sstevel@tonic-gate } 225*0Sstevel@tonic-gate } 226*0Sstevel@tonic-gate 227*0Sstevel@tonic-gate args->returnval = 0; 228*0Sstevel@tonic-gate parsestat = (*args->str2ent)(instr, linelen, args->buf.result, 229*0Sstevel@tonic-gate args->buf.buffer, args->buf.buflen); 230*0Sstevel@tonic-gate 231*0Sstevel@tonic-gate if (parsestat == NSS_STR_PARSE_SUCCESS) { 232*0Sstevel@tonic-gate args->returnval = args->buf.result; 233*0Sstevel@tonic-gate if (check == 0 || (*check)(args)) { 234*0Sstevel@tonic-gate res = NSS_SUCCESS; 235*0Sstevel@tonic-gate break; 236*0Sstevel@tonic-gate } 237*0Sstevel@tonic-gate } else if (parsestat == NSS_STR_PARSE_ERANGE) { 238*0Sstevel@tonic-gate args->erange = 1; /* should we just skip this */ 239*0Sstevel@tonic-gate /* one long line ?? */ 240*0Sstevel@tonic-gate } /* else if (parsestat == NSS_STR_PARSE_PARSE) don't care ! */ 241*0Sstevel@tonic-gate } 242*0Sstevel@tonic-gate 243*0Sstevel@tonic-gate /* 244*0Sstevel@tonic-gate * stayopen is set to 0 by default in order to close the opened 245*0Sstevel@tonic-gate * file. Some applications may break if it is set to 1. 246*0Sstevel@tonic-gate */ 247*0Sstevel@tonic-gate if (check != 0 && !args->stayopen) { 248*0Sstevel@tonic-gate (void) _nss_user_endent(be, 0); 249*0Sstevel@tonic-gate } 250*0Sstevel@tonic-gate 251*0Sstevel@tonic-gate return (res); 252*0Sstevel@tonic-gate } 253*0Sstevel@tonic-gate 254*0Sstevel@tonic-gate 255*0Sstevel@tonic-gate nss_status_t 256*0Sstevel@tonic-gate _nss_user_destr(be, dummy) 257*0Sstevel@tonic-gate user_backend_ptr_t be; 258*0Sstevel@tonic-gate void *dummy; 259*0Sstevel@tonic-gate { 260*0Sstevel@tonic-gate if (be != 0) { 261*0Sstevel@tonic-gate if (be->f != 0) { 262*0Sstevel@tonic-gate _nss_user_endent(be, 0); 263*0Sstevel@tonic-gate } 264*0Sstevel@tonic-gate free((char *)be->filename); 265*0Sstevel@tonic-gate free(be); 266*0Sstevel@tonic-gate } 267*0Sstevel@tonic-gate return (NSS_SUCCESS); /* In case anyone is dumb enough to check */ 268*0Sstevel@tonic-gate } 269*0Sstevel@tonic-gate 270*0Sstevel@tonic-gate nss_backend_t * 271*0Sstevel@tonic-gate _nss_user_constr(ops, n_ops, filename, min_bufsize) 272*0Sstevel@tonic-gate user_backend_op_t ops[]; 273*0Sstevel@tonic-gate int n_ops; 274*0Sstevel@tonic-gate const char *filename; 275*0Sstevel@tonic-gate int min_bufsize; 276*0Sstevel@tonic-gate { 277*0Sstevel@tonic-gate user_backend_ptr_t be; 278*0Sstevel@tonic-gate 279*0Sstevel@tonic-gate if ((be = (user_backend_ptr_t) malloc(sizeof (*be))) == 0) { 280*0Sstevel@tonic-gate return (0); 281*0Sstevel@tonic-gate } 282*0Sstevel@tonic-gate be->ops = ops; 283*0Sstevel@tonic-gate be->n_ops = n_ops; 284*0Sstevel@tonic-gate if ((be->filename = strdup(filename)) == NULL) { 285*0Sstevel@tonic-gate free(be); 286*0Sstevel@tonic-gate return (NULL); 287*0Sstevel@tonic-gate } 288*0Sstevel@tonic-gate be->minbuf = min_bufsize; 289*0Sstevel@tonic-gate be->f = 0; 290*0Sstevel@tonic-gate be->buf = 0; 291*0Sstevel@tonic-gate 292*0Sstevel@tonic-gate return ((nss_backend_t *) be); 293*0Sstevel@tonic-gate } 294