1 /* 2 * Copyright 2016 Chris Torek <chris.torek@gmail.com> 3 * All rights reserved 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted providing that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #ifndef LIB9P_RFUNCS_H 29 #define LIB9P_RFUNCS_H 30 31 #include <grp.h> 32 #include <pwd.h> 33 #include <string.h> 34 35 #if defined(WITH_CASPER) 36 #include <libcasper.h> 37 #endif 38 39 /* 40 * Reentrant, optionally-malloc-ing versions of 41 * basename() and dirname(). 42 */ 43 char *r_basename(const char *, char *, size_t); 44 char *r_dirname(const char *, char *, size_t); 45 46 /* 47 * Yuck: getpwuid, getgrgid are not thread-safe, and the 48 * POSIX replacements (getpwuid_r, getgrgid_r) are horrible. 49 * This is to allow us to loop over the get.*_r calls with ever 50 * increasing buffers until they succeed or get unreasonable 51 * (same idea as the libc code for the non-reentrant versions, 52 * although prettier). 53 * 54 * The getpwuid/getgrgid functions auto-init one of these, 55 * but the caller must call r_pgfree() when done with the 56 * return values. 57 * 58 * If we need more later, we may have to expose the init function. 59 */ 60 struct r_pgdata { 61 char *r_pgbuf; 62 size_t r_pgbufsize; 63 union { 64 struct passwd un_pw; 65 struct group un_gr; 66 } r_pgun; 67 }; 68 69 /* void r_pginit(struct r_pgdata *); */ 70 void r_pgfree(struct r_pgdata *); 71 struct passwd *r_getpwuid(uid_t, struct r_pgdata *); 72 struct group *r_getgrgid(gid_t, struct r_pgdata *); 73 74 #if defined(WITH_CASPER) 75 struct passwd *r_cap_getpwuid(cap_channel_t *, uid_t, struct r_pgdata *); 76 struct group *r_cap_getgrgid(cap_channel_t *, gid_t, struct r_pgdata *); 77 #endif 78 79 #endif /* LIB9P_RFUNCS_H */ 80