/* $OpenBSD: parse_netgroup.c,v 1.8 2003/06/02 23:36:55 millert Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: parse_netgroup.c,v 1.5 1997/02/22 14:22:02 peter Exp $ */ /* * This is a specially hacked-up version of getnetgrent.c used to parse * data from the stored hash table of netgroup info rather than from a * file. It's used mainly for the parse_netgroup() function. All the YP * stuff and file support has been stripped out since it isn't needed. */ #include #include #include #include #include "hash.h" #ifndef lint static const char rcsid[] = "$OpenBSD: parse_netgroup.c,v 1.8 2003/06/02 23:36:55 millert Exp $"; #endif /* * Static Variables and functions used by setnetgrent(), getnetgrent() and * __endnetgrent(). * There are two linked lists: * - linelist is just used by setnetgrent() to parse the net group file via. * parse_netgrp() * - netgrp is the list of entries for the current netgroup */ struct linelist { struct linelist *l_next; /* Chain ptr. */ int l_parsed; /* Flag for cycles */ char *l_groupname; /* Name of netgroup */ char *l_line; /* Netgroup entrie(s) to be parsed */ }; struct netgrp { struct netgrp *ng_next; /* Chain ptr */ char *ng_str[3]; /* Field pointers, see below */ }; #define NG_HOST 0 /* Host name */ #define NG_USER 1 /* User name */ #define NG_DOM 2 /* and Domain name */ static struct linelist *linehead = (struct linelist *)0; static struct netgrp *nextgrp = (struct netgrp *)0; static struct { struct netgrp *gr; char *grname; } grouphead = { (struct netgrp *)0, (char *)0, }; static int parse_netgrp(); static struct linelist *read_for_group(); void __setnetgrent(), __endnetgrent(); int __getnetgrent(); extern struct group_entry *gtable[]; /* * setnetgrent() * Parse the netgroup file looking for the netgroup and build the list * of netgrp structures. Let parse_netgrp() and read_for_group() do * most of the work. */ void __setnetgrent(char *group) { /* Sanity check */ if (group == NULL || !strlen(group)) return; if (grouphead.gr == (struct netgrp *)0 || strcmp(group, grouphead.grname)) { __endnetgrent(); if (parse_netgrp(group)) __endnetgrent(); else { int len = strlen(group) + 1; grouphead.grname = malloc(len); strlcpy(grouphead.grname, group, len); } } nextgrp = grouphead.gr; } /* * Get the next netgroup off the list. */ int __getnetgrent(char **hostp, char **userp, char **domp) { if (nextgrp) { *hostp = nextgrp->ng_str[NG_HOST]; *userp = nextgrp->ng_str[NG_USER]; *domp = nextgrp->ng_str[NG_DOM]; nextgrp = nextgrp->ng_next; return (1); } return (0); } /* * __endnetgrent() - cleanup */ void __endnetgrent(void) { struct linelist *lp, *olp; struct netgrp *gp, *ogp; lp = linehead; while (lp) { olp = lp; lp = lp->l_next; free(olp->l_groupname); free(olp->l_line); free((char *)olp); } linehead = (struct linelist *)0; if (grouphead.grname) { free(grouphead.grname); grouphead.grname = (char *)0; } gp = grouphead.gr; while (gp) { ogp = gp; gp = gp->ng_next; if (ogp->ng_str[NG_HOST]) free(ogp->ng_str[NG_HOST]); if (ogp->ng_str[NG_USER]) free(ogp->ng_str[NG_USER]); if (ogp->ng_str[NG_DOM]) free(ogp->ng_str[NG_DOM]); free((char *)ogp); } grouphead.gr = (struct netgrp *)0; } /* * Parse the netgroup file setting up the linked lists. */ static int parse_netgrp(char *group) { char *spos, *epos; int len, strpos; #ifdef DEBUG int fields; #endif char *pos, *gpos; struct netgrp *grp; struct linelist *lp = linehead; /* * First, see if the line has already been read in. */ while (lp) { if (!strcmp(group, lp->l_groupname)) break; lp = lp->l_next; } if (lp == (struct linelist *)0 && (lp = read_for_group(group)) == (struct linelist *)0) return (1); if (lp->l_parsed) { #ifdef DEBUG /* * This error message is largely superflous since the * code handles the error condition successfully, and * spewing it out from inside libc can actually hose * certain programs. */ fprintf(stderr, "Cycle in netgroup %s\n", lp->l_groupname); #endif return (1); } else lp->l_parsed = 1; pos = lp->l_line; /* Watch for null pointer dereferences, dammit! */ while (pos != NULL && *pos != '\0') { if (*pos == '(') { grp = (struct netgrp *)malloc(sizeof (struct netgrp)); bzero((char *)grp, sizeof (struct netgrp)); grp->ng_next = grouphead.gr; grouphead.gr = grp; pos++; gpos = strsep(&pos, ")"); #ifdef DEBUG fields = 0; #endif for (strpos = 0; strpos < 3; strpos++) { if ((spos = strsep(&gpos, ","))) { #ifdef DEBUG fields++; #endif while (*spos == ' ' || *spos == '\t') spos++; if ((epos = strpbrk(spos, " \t"))) { *epos = '\0'; len = epos - spos; } else len = strlen(spos); if (len > 0) { grp->ng_str[strpos] = (char *) malloc(len + 1); bcopy(spos, grp->ng_str[strpos], len + 1); } } else { /* * All other systems I've tested * return NULL for empty netgroup * fields. It's up to user programs * to handle the NULLs appropriately. */ grp->ng_str[strpos] = NULL; } } #ifdef DEBUG /* * Note: on other platforms, malformed netgroup * entries are not normally flagged. While we * can catch bad entries and report them, we should * stay silent by default for compatibility's sake. */ if (fields < 3) fprintf(stderr, "Bad entry (%s%s%s%s%s) in netgroup \"%s\"\n", grp->ng_str[NG_HOST] == NULL ? "" : grp->ng_str[NG_HOST], grp->ng_str[NG_USER] == NULL ? "" : ",", grp->ng_str[NG_USER] == NULL ? "" : grp->ng_str[NG_USER], grp->ng_str[NG_DOM] == NULL ? "" : ",", grp->ng_str[NG_DOM] == NULL ? "" : grp->ng_str[NG_DOM], lp->l_groupname); #endif } else { spos = strsep(&pos, ", \t"); if (parse_netgrp(spos)) continue; } /* Watch for null pointer dereferences, dammit! */ if (pos != NULL) while (*pos == ' ' || *pos == ',' || *pos == '\t') pos++; } return (0); } /* * Read the netgroup file and save lines until the line for the netgroup * is found. Return 1 if eof is encountered. */ static struct linelist * read_for_group(char *group) { char *pos, *spos, *linep = NULL, *olinep = NULL; int len, olen; int cont; struct linelist *lp; char line[LINSIZ + 1]; char *data = NULL; data = lookup (gtable, group); snprintf(line, sizeof line, "%s %s", group, data); pos = (char *)&line; #ifdef CANT_HAPPEN if (*pos == '#') continue; #endif while (*pos == ' ' || *pos == '\t') pos++; spos = pos; while (*pos != ' ' && *pos != '\t' && *pos != '\n' && *pos != '\0') pos++; len = pos - spos; while (*pos == ' ' || *pos == '\t') pos++; if (*pos != '\n' && *pos != '\0') { lp = (struct linelist *)malloc(sizeof (*lp)); lp->l_parsed = 0; lp->l_groupname = (char *)malloc(len + 1); bcopy(spos, lp->l_groupname, len); *(lp->l_groupname + len) = '\0'; len = strlen(pos); olen = 0; /* * Loop around handling line continuations. */ do { if (*(pos + len - 1) == '\n') len--; if (*(pos + len - 1) == '\\') { len--; cont = 1; } else cont = 0; if (len > 0) { linep = (char *)malloc(olen + len + 1); if (olen > 0) { bcopy(olinep, linep, olen); free(olinep); } bcopy(pos, linep + olen, len); olen += len; *(linep + olen) = '\0'; olinep = linep; } #ifdef CANT_HAPPEN if (cont) { if (fgets(line, LINSIZ, netf)) { pos = line; len = strlen(pos); } else cont = 0; } #endif } while (cont); lp->l_line = linep; lp->l_next = linehead; linehead = lp; #ifdef CANT_HAPPEN /* * If this is the one we wanted, we are done. */ if (!strcmp(lp->l_groupname, group)) #endif return (lp); } return ((struct linelist *)0); }