/* $NetBSD: dns_gr.c,v 1.1.1.2 2012/09/09 16:07:52 christos Exp $ */ /* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "Id: dns_gr.c,v 1.4 2005/04/27 04:56:21 sra Exp "; #endif /*! \file * \brief * dns_gr.c --- this file contains the functions for accessing * group information from Hesiod. */ #include "port_before.h" #ifndef WANT_IRS_GR static int __bind_irs_gr_unneeded; #else #include #include #include #include #include #include #include #include #include #include #include #include #include #include "port_after.h" #include "irs_p.h" #include "hesiod.h" #include "dns_p.h" /* Types. */ struct pvt { /* * This is our private accessor data. It has a shared hesiod context. */ struct dns_p * dns; /* * Need space to store the entries read from the group file. * The members list also needs space per member, and the * strings making up the user names must be allocated * somewhere. Rather than doing lots of small allocations, * we keep one buffer and resize it as needed. */ struct group group; size_t nmemb; /*%< Malloc'd max index of gr_mem[]. */ char * membuf; size_t membufsize; }; /* Forward. */ static struct group * gr_next(struct irs_gr *); static struct group * gr_byname(struct irs_gr *, const char *); static struct group * gr_bygid(struct irs_gr *, gid_t); static void gr_rewind(struct irs_gr *); static void gr_close(struct irs_gr *); static int gr_list(struct irs_gr *, const char *, gid_t, gid_t *, int *); static void gr_minimize(struct irs_gr *); static struct __res_state * gr_res_get(struct irs_gr *); static void gr_res_set(struct irs_gr *, struct __res_state *, void (*)(void *)); static struct group * get_hes_group(struct irs_gr *this, const char *name, const char *type); /* Public. */ struct irs_gr * irs_dns_gr(struct irs_acc *this) { struct dns_p *dns = (struct dns_p *)this->private; struct irs_gr *gr; struct pvt *pvt; if (!dns || !dns->hes_ctx) { errno = ENODEV; return (NULL); } if (!(pvt = memget(sizeof *pvt))) { errno = ENOMEM; return (NULL); } memset(pvt, 0, sizeof *pvt); pvt->dns = dns; if (!(gr = memget(sizeof *gr))) { memput(pvt, sizeof *pvt); errno = ENOMEM; return (NULL); } memset(gr, 0x5e, sizeof *gr); gr->private = pvt; gr->next = gr_next; gr->byname = gr_byname; gr->bygid = gr_bygid; gr->rewind = gr_rewind; gr->close = gr_close; gr->list = gr_list; gr->minimize = gr_minimize; gr->res_get = gr_res_get; gr->res_set = gr_res_set; return (gr); } /* methods */ static void gr_close(struct irs_gr *this) { struct pvt *pvt = (struct pvt *)this->private; if (pvt->group.gr_mem) free(pvt->group.gr_mem); if (pvt->membuf) free(pvt->membuf); memput(pvt, sizeof *pvt); memput(this, sizeof *this); } static struct group * gr_next(struct irs_gr *this) { UNUSED(this); return (NULL); } static struct group * gr_byname(struct irs_gr *this, const char *name) { return (get_hes_group(this, name, "group")); } static struct group * gr_bygid(struct irs_gr *this, gid_t gid) { char name[32]; sprintf(name, "%ld", (long)gid); return (get_hes_group(this, name, "gid")); } static void gr_rewind(struct irs_gr *this) { UNUSED(this); /* NOOP */ } static int gr_list(struct irs_gr *this, const char *name, gid_t basegid, gid_t *groups, int *ngroups) { UNUSED(this); UNUSED(name); UNUSED(basegid); UNUSED(groups); *ngroups = 0; /* There's some way to do this in Hesiod. */ return (-1); } static void gr_minimize(struct irs_gr *this) { UNUSED(this); /* NOOP */ } /* Private. */ static struct group * get_hes_group(struct irs_gr *this, const char *name, const char *type) { struct pvt *pvt = (struct pvt *)this->private; char **hes_list, *cp, **new; size_t num_members = 0; u_long t; hes_list = hesiod_resolve(pvt->dns->hes_ctx, name, type); if (!hes_list) return (NULL); /* * Copy the returned hesiod string into storage space. */ if (pvt->membuf) free(pvt->membuf); pvt->membuf = strdup(*hes_list); hesiod_free_list(pvt->dns->hes_ctx, hes_list); cp = pvt->membuf; pvt->group.gr_name = cp; if (!(cp = strchr(cp, ':'))) goto cleanup; *cp++ = '\0'; pvt->group.gr_passwd = cp; if (!(cp = strchr(cp, ':'))) goto cleanup; *cp++ = '\0'; errno = 0; t = strtoul(cp, NULL, 10); if (errno == ERANGE) goto cleanup; pvt->group.gr_gid = (gid_t) t; if (!(cp = strchr(cp, ':'))) goto cleanup; cp++; /* * Parse the members out. */ while (*cp) { if (num_members+1 >= pvt->nmemb || pvt->group.gr_mem == NULL) { pvt->nmemb += 10; new = realloc(pvt->group.gr_mem, pvt->nmemb * sizeof(char *)); if (new == NULL) goto cleanup; pvt->group.gr_mem = new; } pvt->group.gr_mem[num_members++] = cp; if (!(cp = strchr(cp, ','))) break; *cp++ = '\0'; } if (!pvt->group.gr_mem) { pvt->group.gr_mem = malloc(sizeof(char*)); if (!pvt->group.gr_mem) goto cleanup; } pvt->group.gr_mem[num_members] = NULL; return (&pvt->group); cleanup: if (pvt->group.gr_mem) { free(pvt->group.gr_mem); pvt->group.gr_mem = NULL; } if (pvt->membuf) { free(pvt->membuf); pvt->membuf = NULL; } return (NULL); } static struct __res_state * gr_res_get(struct irs_gr *this) { struct pvt *pvt = (struct pvt *)this->private; struct dns_p *dns = pvt->dns; return (__hesiod_res_get(dns->hes_ctx)); } static void gr_res_set(struct irs_gr *this, struct __res_state * res, void (*free_res)(void *)) { struct pvt *pvt = (struct pvt *)this->private; struct dns_p *dns = pvt->dns; __hesiod_res_set(dns->hes_ctx, res, free_res); } #endif /* WANT_IRS_GR */