diff options
Diffstat (limited to 'nis/nss_nis/nis-initgroups.c')
| -rw-r--r-- | nis/nss_nis/nis-initgroups.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/nis/nss_nis/nis-initgroups.c b/nis/nss_nis/nis-initgroups.c new file mode 100644 index 0000000000..5960c80502 --- /dev/null +++ b/nis/nss_nis/nis-initgroups.c @@ -0,0 +1,204 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <nss.h> +#include <grp.h> +#include <ctype.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> +#include <rpcsvc/yp.h> +#include <rpcsvc/ypclnt.h> + +#include "nss-nis.h" + +/* Get the declaration of the parser function. */ +#define ENTNAME grent +#define STRUCTURE group +#define EXTERN_PARSER +#include <nss/nss_files/files-parse.c> + +struct response_t +{ + char *val; + struct response_t *next; +}; + +struct intern_t +{ + struct response_t *start; + struct response_t *next; +}; +typedef struct intern_t intern_t; + +static int +saveit (int instatus, char *inkey, int inkeylen, char *inval, + int invallen, char *indata) +{ + intern_t *intern = (intern_t *) indata; + + if (instatus != YP_TRUE) + return instatus; + + if (inkey && inkeylen > 0 && inval && invallen > 0) + { + if (intern->start == NULL) + { + intern->start = malloc (sizeof (struct response_t)); + intern->next = intern->start; + } + else + { + intern->next->next = malloc (sizeof (struct response_t)); + intern->next = intern->next->next; + } + intern->next->next = NULL; + intern->next->val = malloc (invallen + 1); + strncpy (intern->next->val, inval, invallen); + intern->next->val[invallen] = '\0'; + } + + return 0; +} + +static enum nss_status +internal_setgrent (intern_t *intern) +{ + char *domainname; + struct ypall_callback ypcb; + enum nss_status status; + + if (yp_get_default_domain (&domainname)) + return NSS_STATUS_UNAVAIL; + + intern->start = NULL; + + ypcb.foreach = saveit; + ypcb.data = (char *) intern; + status = yperr2nss (yp_all (domainname, "group.byname", &ypcb)); + intern->next = intern->start; + + return status; +} + +static enum nss_status +internal_getgrent_r (struct group *grp, char *buffer, size_t buflen, + int *errnop, intern_t *intern) +{ + struct parser_data *data = (void *) buffer; + int parse_res; + char *p; + + if (intern->start == NULL) + internal_setgrent (intern); + + /* Get the next entry until we found a correct one. */ + do + { + if (intern->next == NULL) + return NSS_STATUS_NOTFOUND; + p = strncpy (buffer, intern->next->val, buflen); + while (isspace (*p)) + ++p; + + parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop); + if (parse_res == -1) + return NSS_STATUS_TRYAGAIN; + intern->next = intern->next->next; + } + while (!parse_res); + + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_nis_initgroups (const char *user, gid_t group, long int *start, + long int *size, gid_t *groups, long int limit, + int *errnop) +{ + struct group grpbuf, *g; + size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX); + char *tmpbuf; + enum nss_status status; + intern_t intern = { NULL, NULL }; + + status = internal_setgrent (&intern); + if (status != NSS_STATUS_SUCCESS) + return status; + + tmpbuf = __alloca (buflen); + + do + { + while ((status = + internal_getgrent_r (&grpbuf, tmpbuf, buflen, errnop, + &intern)) == NSS_STATUS_TRYAGAIN + && *errnop == ERANGE) + { + buflen *= 2; + tmpbuf = __alloca (buflen); + } + + if (status != NSS_STATUS_SUCCESS) + goto done; + + + g = &grpbuf; + if (g->gr_gid != group) + { + char **m; + + for (m = g->gr_mem; *m != NULL; ++m) + if (strcmp (*m, user) == 0) + { + /* Matches user. Insert this group. */ + if (*start == *size && limit <= 0) + { + /* Need a bigger buffer. */ + groups = realloc (groups, *size * sizeof (*groups)); + if (groups == NULL) + goto done; + *size *= 2; + } + + groups[*start] = g->gr_gid; + *start += 1; + + if (*start == limit) + /* Can't take any more groups; stop searching. */ + goto done; + + break; + } + } + } + while (status == NSS_STATUS_SUCCESS); + +done: + while (intern.start != NULL) + { + if (intern.start->val != NULL) + free (intern.start->val); + intern.next = intern.start; + intern.start = intern.start->next; + free (intern.next); + } + + return NSS_STATUS_SUCCESS; +} |