/* Copyright (C) 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. 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 <stdio.h> #include <unistd.h> #include <string.h> #include <rpc/rpc.h> #include "nsswitch.h" #define OPSYS_LEN 4 #define MAXIPRINT (11) /* max length of printed integer */ static const char *OPSYS = "unix"; int user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain) { char dfltdom[MAXNETNAMELEN + 1]; size_t i; if (domain == NULL) { if (getdomainname (dfltdom, sizeof (dfltdom)) < 0) return 0; } else { strncpy (dfltdom, domain, MAXNETNAMELEN); dfltdom[MAXNETNAMELEN] = '\0'; } if ((strlen (dfltdom) + OPSYS_LEN + 3 + MAXIPRINT) > (size_t) MAXNETNAMELEN) return 0; sprintf (netname, "%s.%d@%s", OPSYS, uid, dfltdom); i = strlen (netname); if (netname[i - 1] == '.') netname[i - 1] = '\0'; return 1; } int host2netname (char netname[MAXNETNAMELEN + 1], const char *host, const char *domain) { char *p; char hostname[MAXHOSTNAMELEN + 1]; char domainname[MAXHOSTNAMELEN + 1]; char *dot_in_host; size_t i; netname[0] = '\0'; /* make null first (no need for memset) */ if (host == NULL) gethostname (hostname, MAXHOSTNAMELEN); else { strncpy (hostname, host, MAXHOSTNAMELEN); hostname[MAXHOSTNAMELEN] = '\0'; } dot_in_host = strchr (hostname, '.'); if (domain == NULL) { p = dot_in_host; if (p) { strncpy (domainname, p, MAXHOSTNAMELEN); domainname[MAXHOSTNAMELEN] = '\0'; } else { domainname[0] = 0; getdomainname (domainname, MAXHOSTNAMELEN); } } else { strncpy (domainname, domain, MAXHOSTNAMELEN); domainname[MAXHOSTNAMELEN] = '\0'; } i = strlen (domainname); if (i == 0) /* No domainname */ return 0; if (domainname[i - 1] == '.') domainname[i - 1] = 0; if (dot_in_host) /* strip off rest of name */ *dot_in_host = '\0'; if ((strlen (domainname) + strlen (hostname) + OPSYS_LEN + 3) > MAXNETNAMELEN) return 0; sprintf (netname, "%s.%s@%s", OPSYS, hostname, domainname); return 1; } int getnetname (char name[MAXNETNAMELEN + 1]) { uid_t uid; int dummy; uid = geteuid (); if (uid == 0) dummy = host2netname (name, NULL, NULL); else dummy = user2netname (name, uid, NULL); return (dummy); } /* Type of the lookup function for netname2user. */ typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1], uid_t *, gid_t *, int *, gid_t *); /* The lookup function for the first entry of this service. */ extern int __nss_publickey_lookup (service_user ** nip, const char *name, void **fctp); int netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp, int *gidlenp, gid_t * gidlist) { static service_user *startp = NULL; static netname2user_function start_fct; service_user *nip; netname2user_function fct; enum nss_status status = NSS_STATUS_UNAVAIL; int no_more; if (startp == NULL) { no_more = __nss_publickey_lookup (&nip, "netname2user", (void **) &fct); if (no_more) startp = (service_user *) - 1; else { startp = nip; start_fct = fct; } } else { fct = start_fct; no_more = (nip = startp) == (service_user *) - 1; } while (!no_more) { status = (*fct) (netname, uidp, gidp, gidlenp, gidlist); no_more = __nss_next (&nip, "netname2user", (void **) &fct, status, 0); } return status == NSS_STATUS_SUCCESS; } int netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname, const int hostlen) { char *p1, *p2; char buffer[MAXNETNAMELEN + 1]; p1 = strchr (buffer, '.'); if (p1 == NULL) return 0; p1++; p2 = strchr (p1, '@'); if (p2 == NULL) return 0; *p2 = '\0'; if (hostlen > MAXNETNAMELEN) return 0; strncpy (hostname, p1, hostlen); hostname[hostlen] = '\0'; return 1; }