251 lines
7.8 KiB
C
251 lines
7.8 KiB
C
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=2 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/weirdtypes.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "third_party/musl/passwd.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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#define PTHREAD_CANCEL_DISABLE 0
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#define pthread_setcancelstate(x, y) (void)y
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static unsigned atou(char **s) {
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unsigned x;
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for (x = 0; **s - '0' < 10U; ++*s) x = 10 * x + (**s - '0');
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return x;
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}
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static int __getgrent_a(FILE *f, struct group *gr, char **line, size_t *size,
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char ***mem, size_t *nmem, struct group **res) {
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ssize_t l;
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char *s, *mems;
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size_t i;
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int rv = 0;
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int cs;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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for (;;) {
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if ((l = getline(line, size, f)) < 0) {
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rv = ferror(f) ? errno : 0;
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free(*line);
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*line = 0;
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gr = 0;
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goto end;
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}
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line[0][l - 1] = 0;
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s = line[0];
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gr->gr_name = s++;
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if (!(s = strchr(s, ':'))) continue;
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*s++ = 0;
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gr->gr_passwd = s;
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if (!(s = strchr(s, ':'))) continue;
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*s++ = 0;
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gr->gr_gid = atou(&s);
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if (*s != ':') continue;
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*s++ = 0;
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mems = s;
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break;
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}
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for (*nmem = !!*s; *s; s++)
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if (*s == ',') ++*nmem;
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free(*mem);
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*mem = calloc(sizeof(char *), *nmem + 1);
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if (!*mem) {
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rv = errno;
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free(*line);
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*line = 0;
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gr = 0;
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goto end;
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}
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if (*mems) {
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mem[0][0] = mems;
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for (s = mems, i = 0; *s; s++)
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if (*s == ',') *s++ = 0, mem[0][++i] = s;
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mem[0][++i] = 0;
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} else {
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mem[0][0] = 0;
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}
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gr->gr_mem = *mem;
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end:
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pthread_setcancelstate(cs, 0);
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*res = gr;
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if (rv) errno = rv;
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return rv;
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}
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static int __getgr_a(const char *name, gid_t gid, struct group *gr, char **buf,
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size_t *size, char ***mem, size_t *nmem,
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struct group **res) {
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FILE *f;
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int rv = 0;
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int cs;
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*res = 0;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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f = fopen("/etc/group", "rbe");
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if (!f) {
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rv = errno;
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goto done;
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}
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while (!(rv = __getgrent_a(f, gr, buf, size, mem, nmem, res)) && *res) {
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if ((name && !strcmp(name, (*res)->gr_name)) ||
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(!name && (*res)->gr_gid == gid)) {
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break;
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}
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}
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done:
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pthread_setcancelstate(cs, 0);
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if (rv) errno = rv;
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return rv;
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}
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static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf,
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size_t size, struct group **res) {
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#define FIX(x) (gr->gr_##x = gr->gr_##x - line + buf)
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char *line = 0;
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size_t len = 0;
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char **mem = 0;
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size_t nmem = 0;
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int rv = 0;
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size_t i;
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int cs;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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rv = __getgr_a(name, gid, gr, &line, &len, &mem, &nmem, res);
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if (*res && size < len + (nmem + 1) * sizeof(char *) + 32) {
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*res = 0;
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rv = ERANGE;
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}
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if (*res) {
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buf += (16 - (uintptr_t)buf) % 16;
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gr->gr_mem = (void *)buf;
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buf += (nmem + 1) * sizeof(char *);
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memcpy(buf, line, len);
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FIX(name);
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FIX(passwd);
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for (i = 0; mem[i]; i++) gr->gr_mem[i] = mem[i] - line + buf;
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gr->gr_mem[i] = 0;
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}
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free(mem);
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free(line);
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pthread_setcancelstate(cs, 0);
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if (rv) errno = rv;
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return rv;
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#undef FIX
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}
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int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups) {
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int rv, nlim, ret = -1;
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ssize_t i, n = 1;
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struct group gr;
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struct group *res;
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FILE *f;
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char *buf = 0;
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char **mem = 0;
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size_t nmem = 0;
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size_t size;
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nlim = *ngroups;
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if (nlim >= 1) *groups++ = gid;
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f = fopen("/etc/group", "rbe");
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if (!f && errno != ENOENT && errno != ENOTDIR) goto cleanup;
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if (f) {
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while (!(rv = __getgrent_a(f, &gr, &buf, &size, &mem, &nmem, &res)) &&
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res) {
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for (i = 0; gr.gr_mem[i] && strcmp(user, gr.gr_mem[i]); i++)
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;
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if (!gr.gr_mem[i]) continue;
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if (++n <= nlim) *groups++ = gr.gr_gid;
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}
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if (rv) {
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errno = rv;
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goto cleanup;
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}
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}
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ret = n > nlim ? -1 : n;
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*ngroups = n;
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cleanup:
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if (f) fclose(f);
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free(buf);
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free(mem);
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return ret;
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}
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int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size,
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struct group **res) {
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return getgr_r(name, 0, gr, buf, size, res);
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}
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int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size,
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struct group **res) {
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return getgr_r(0, gid, gr, buf, size, res);
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}
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static struct GetgrentState {
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FILE *f;
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char *line;
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char **mem;
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struct group gr;
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} g_getgrent[1];
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void endgrent() {
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setgrent();
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}
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void setgrent() {
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if (g_getgrent->f) fclose(g_getgrent->f);
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g_getgrent->f = 0;
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}
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struct group *getgrent() {
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struct group *res;
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size_t size = 0, nmem = 0;
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if (!g_getgrent->f) g_getgrent->f = fopen("/etc/group", "rbe");
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if (!g_getgrent->f) return 0;
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__getgrent_a(g_getgrent->f, &g_getgrent->gr, &g_getgrent->line, &size,
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&g_getgrent->mem, &nmem, &res);
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return res;
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}
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struct group *getgrgid(gid_t gid) {
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struct group *res;
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size_t size = 0, nmem = 0;
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__getgr_a(0, gid, &g_getgrent->gr, &g_getgrent->line, &size, &g_getgrent->mem,
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&nmem, &res);
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return res;
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}
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struct group *getgrnam(const char *name) {
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struct group *res;
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size_t size = 0, nmem = 0;
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__getgr_a(name, 0, &g_getgrent->gr, &g_getgrent->line, &size,
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&g_getgrent->mem, &nmem, &res);
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return res;
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}
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