88d3a31c17
getxxyyy.c uses the USER environment variable to determine a user to test getpwnam_r(). If this variable is unset then the test will seg fault. We work around this issue by defaulting to ``root'' if USER is not set. This is not perfect as root may not exist on the system but given that user does exist on most systems, this is the best default that we can choose if we have no other options available.
137 lines
3.6 KiB
C
137 lines
3.6 KiB
C
/*
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* Copyright (c) 2011 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "roken.h"
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#ifdef TEST_GETXXYYY
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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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rk_getpwnam_r(const char *, struct passwd *, char *, size_t, struct passwd **);
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#endif
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#if !defined(POSIX_GETPWNAM_R) || defined(TEST_GETXXYYY)
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/*
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* At least limit the race between threads
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*/
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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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rk_getpwnam_r(const char *name, struct passwd *pwd, char *buffer,
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size_t bufsize, struct passwd **result)
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{
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struct passwd *p;
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size_t slen, n = 0;
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*result = NULL;
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p = getpwnam(name);
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if(p == NULL)
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return (errno = ENOENT);
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memset(pwd, 0, sizeof(*pwd));
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#define APPEND(el) \
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do { \
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slen = strlen(p->el) + 1; \
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if (slen > bufsize) return (errno = ENOMEM); \
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memcpy(buffer, p->el, slen); \
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pwd->el = buffer; \
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buffer += slen; \
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bufsize -= slen; \
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} while(0)
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APPEND(pw_name);
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if (p->pw_passwd)
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APPEND(pw_name);
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pwd->pw_uid = p->pw_uid;
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pwd->pw_gid = p->pw_gid;
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APPEND(pw_gecos);
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APPEND(pw_dir);
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APPEND(pw_shell);
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*result = pwd;
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return 0;
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}
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#endif /* POSIX_GETPWNAM_R */
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#ifdef TEST_GETXXYYY
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#include <err.h>
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int verbose_flag = 0;
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static void
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print_result(struct passwd *p)
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{
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if (!verbose_flag)
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return;
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printf("%s\n", p->pw_name);
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printf("%d\n", (int)p->pw_uid);
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printf("%s\n", p->pw_shell);
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printf("%s\n", p->pw_dir);
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}
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int
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main(int argc, char **argv)
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{
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struct passwd pwd, *result;
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char buf[1024];
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int ret;
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const char *user;
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user = getenv("USER");
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if (!user)
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user = "root";
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ret = rk_getpwnam_r(user, &pwd, buf, sizeof(buf), &result);
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if (ret)
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errx(1, "rk_getpwnam_r");
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print_result(result);
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ret = rk_getpwnam_r(user, &pwd, buf, 1, &result);
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if (ret == 0)
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errx(1, "rk_getpwnam_r too small buf");
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ret = rk_getpwnam_r("no-user-here-promise", &pwd, buf, sizeof(buf), &result);
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if (ret == 0)
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errx(1, "rk_getpwnam_r no user");
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return 0;
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}
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#endif
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