diff options
Diffstat (limited to 'src/io.c')
| -rw-r--r-- | src/io.c | 126 |
1 files changed, 126 insertions, 0 deletions
@@ -15,9 +15,12 @@ #include <unistd.h> #include <malloc.h> #include <sys/mman.h> +#include <pwd.h> +#include <grp.h> #include "apk_defines.h" #include "apk_io.h" +#include "apk_hash.h" struct apk_fd_istream { struct apk_istream is; @@ -715,3 +718,126 @@ size_t apk_ostream_write_string(struct apk_ostream *os, const char *string) return len; } + +struct cache_item { + apk_hash_node hash_node; + unsigned int genid; + union { + uid_t uid; + gid_t gid; + }; + unsigned short len; + char name[]; +}; + +static apk_blob_t cache_item_get_key(apk_hash_item item) +{ + struct cache_item *ci = (struct cache_item *) item; + return APK_BLOB_PTR_LEN(ci->name, ci->len); +} + +static const struct apk_hash_ops id_hash_ops = { + .node_offset = offsetof(struct cache_item, hash_node), + .get_key = cache_item_get_key, + .hash_key = apk_blob_hash, + .compare = apk_blob_compare, + .delete_item = (apk_hash_delete_f) free, +}; + +static struct cache_item *resolve_cache_item(struct apk_hash *hash, apk_blob_t name) +{ + struct cache_item *ci; + unsigned long h; + + h = id_hash_ops.hash_key(name); + ci = (struct cache_item *) apk_hash_get_hashed(hash, name, h); + if (ci != NULL) + return ci; + + ci = calloc(1, sizeof(struct cache_item) + name.len); + if (ci == NULL) + return NULL; + + ci->len = name.len; + memcpy(ci->name, name.ptr, name.len); + apk_hash_insert_hashed(hash, ci, h); + + return ci; +} + +static unsigned int id_genid = 0; +static struct apk_hash uid_cache, gid_cache; + +void apk_id_cache_init(void) +{ + apk_hash_init(&uid_cache, &id_hash_ops, 256); + apk_hash_init(&gid_cache, &id_hash_ops, 256); + id_genid = 1; +} + +void apk_id_cache_free(void) +{ + apk_hash_free(&uid_cache); + apk_hash_free(&gid_cache); +} + +void apk_id_cache_reset(void) +{ + id_genid++; + if (id_genid == 0) + id_genid = 1; +} + +uid_t apk_resolve_uid(const char *username, uid_t default_uid) +{ + struct cache_item *ci; + struct passwd pwent, *pwd; + char buf[1024]; + int r; + + ci = resolve_cache_item(&uid_cache, APK_BLOB_STR(username)); + if (ci == NULL) + return default_uid; + + if (ci->genid != id_genid) { + r = getpwnam_r(username, &pwent, buf, sizeof(buf), &pwd); + if (pwd != NULL) + ci->uid = pwd->pw_uid; + else + ci->uid = -1; + if (r == 0) + ci->genid = id_genid; + } + + if (ci->uid != -1) + return ci->uid; + + return default_uid; +} + +uid_t apk_resolve_gid(const char *groupname, uid_t default_gid) +{ + struct cache_item *ci; + struct group grent, *grp; + char buf[1024]; + int r; + + ci = resolve_cache_item(&gid_cache, APK_BLOB_STR(groupname)); + if (ci == NULL) + return default_gid; + + if (ci->genid != id_genid) { + r = getgrnam_r(groupname, &grent, buf, sizeof(buf), &grp); + if (grp != NULL) + ci->gid = grp->gr_gid; + else + ci->gid = -1; + if (r == 0) + ci->genid = id_genid; + } + + if (ci->gid != -1) + return ci->gid; + + return default_gid; +} |