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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| #include <assert.h> | ||
| #include <errno.h> | ||
| #include <sys/stat.h> | ||
| #include <pwd.h> | ||
| #include <grp.h> | ||
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| #include "defs.h" | ||
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| int | ||
| file_mode_check(const char *file, const mode_t mode) { | ||
| struct stat sb; | ||
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| assert(file != NULL); | ||
| assert(mode); | ||
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| if (lstat(file, &sb) == -1) | ||
| return -errno; | ||
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| if (sb.st_mode != mode) | ||
| return ERANGE; | ||
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| return 0; | ||
| } | ||
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| int | ||
| file_owner_check(const char *file, const char *owner) { | ||
| struct stat sb; | ||
| struct passwd *pw; | ||
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| assert(file != NULL); | ||
| assert(owner != NULL); | ||
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| if (lstat(file, &sb) == -1) | ||
| return -errno; | ||
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| if ((pw = getpwnam(owner)) == NULL) | ||
| return -errno; | ||
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| if (sb.st_uid != pw->pw_uid) | ||
| return ERANGE; | ||
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| return 0; | ||
| } | ||
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| int | ||
| file_group_check(const char *file, const char *grp) { | ||
| struct stat sb; | ||
| struct group *gr; | ||
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| assert(file != NULL); | ||
| assert(grp != NULL); | ||
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| if (lstat(file, &sb) == -1) | ||
| return -errno; | ||
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| if ((gr = getgrnam(grp)) == NULL) | ||
| return -errno; | ||
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| if (sb.st_uid != gr->gr_gid) | ||
| return ERANGE; | ||
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| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| /* | ||
| * Copyright (C) 2015-2020 Leah Neukirchen | ||
| * Parts of code derived from musl libc, which is | ||
| * Copyright (C) 2005-2014 Rich Felker, et al. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining | ||
| * a copy of this software and associated documentation files (the | ||
| * "Software"), to deal in the Software without restriction, including | ||
| * without limitation the rights to use, copy, modify, merge, publish, | ||
| * distribute, sublicense, and/or sell copies of the Software, and to | ||
| * permit persons to whom the Software is furnished to do so, subject to | ||
| * the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be | ||
| * included in all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | ||
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | ||
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | ||
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
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| #include <sys/types.h> | ||
| #include <pwd.h> | ||
| #include <grp.h> | ||
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| /* AA-tree implementation, adapted from https://github.com/ccxvii/minilibs */ | ||
| struct idtree { | ||
| long id; | ||
| char *name; | ||
| struct idtree *left, *right; | ||
| int level; | ||
| }; | ||
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| static struct idtree idtree_sentinel = { 0, 0, &idtree_sentinel, &idtree_sentinel, 0 }; | ||
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| static struct idtree * | ||
| idtree_make(long id, char *name) | ||
| { | ||
| struct idtree *node = malloc(sizeof (struct idtree)); | ||
| node->id = id; | ||
| node->name = name; | ||
| node->left = node->right = &idtree_sentinel; | ||
| node->level = 1; | ||
| return node; | ||
| } | ||
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| char * | ||
| idtree_lookup(struct idtree *node, long id) | ||
| { | ||
| if (node) { | ||
| while (node != &idtree_sentinel) { | ||
| if (id == node->id) | ||
| return node->name; | ||
| else if (id < node->id) | ||
| node = node->left; | ||
| else | ||
| node = node->right; | ||
| } | ||
| } | ||
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| return 0; | ||
| } | ||
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| static struct idtree * | ||
| idtree_skew(struct idtree *node) | ||
| { | ||
| if (node->left->level == node->level) { | ||
| struct idtree *save = node; | ||
| node = node->left; | ||
| save->left = node->right; | ||
| node->right = save; | ||
| } | ||
| return node; | ||
| } | ||
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| static struct idtree * | ||
| idtree_split(struct idtree *node) | ||
| { | ||
| if (node->right->right->level == node->level) { | ||
| struct idtree *save = node; | ||
| node = node->right; | ||
| save->right = node->left; | ||
| node->left = save; | ||
| node->level++; | ||
| } | ||
| return node; | ||
| } | ||
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| struct idtree * | ||
| idtree_insert(struct idtree *node, long id, char *name) | ||
| { | ||
| if (node && node != &idtree_sentinel) { | ||
| if (id == node->id) | ||
| return node; | ||
| else if (id < node->id) | ||
| node->left = idtree_insert(node->left, id, name); | ||
| else | ||
| node->right = idtree_insert(node->right, id, name); | ||
| node = idtree_skew(node); | ||
| node = idtree_split(node); | ||
| return node; | ||
| } | ||
| return idtree_make(id, name); | ||
| } | ||
| /**/ | ||
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| static char * | ||
| strid(long id) | ||
| { | ||
| static char buf[32]; | ||
| snprintf(buf, sizeof buf, "%ld", id); | ||
| return buf; | ||
| } | ||
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| static char * | ||
| groupname(struct idtree *groups, gid_t gid) | ||
| { | ||
| char *name = idtree_lookup(groups, gid); | ||
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| if (name) | ||
| return name; | ||
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| struct group *g = getgrgid(gid); | ||
| if (g) { | ||
| char *name = strdup(g->gr_name); | ||
| groups = idtree_insert(groups, gid, name); | ||
| return name; | ||
| } | ||
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| return strid(gid); | ||
| } | ||
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| static char * | ||
| username(struct idtree *users, uid_t uid) | ||
| { | ||
| char *name = idtree_lookup(users, uid); | ||
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| if (name) | ||
| return name; | ||
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| struct passwd *p = getpwuid(uid); | ||
| if (p) { | ||
| char *name = strdup(p->pw_name); | ||
| users = idtree_insert(users, uid, name); | ||
| return name; | ||
| } | ||
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| return strid(uid); | ||
| } |