From 341202d382d0e721d311f530168d494c58348145 Mon Sep 17 00:00:00 2001 From: pixdamix@gmail.com Date: Thu, 22 Nov 2012 04:17:38 -0500 Subject: Ensure we use the uname/gname fields when extracting tarballs When updating packages on the target device we ideally want to match user and group numbers from the existing file system. This patch encourages opkg to lookup the uname/gname fields first and only use the hardcoded numerical values if that fails. Signed-off-by: Richard Purdie Signed-off-by: Martin Jansa git-svn-id: http://opkg.googlecode.com/svn/trunk@637 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358 --- (limited to 'libbb') diff --git a/libbb/unarchive.c b/libbb/unarchive.c index 5d4464f..d583767 100644 --- a/libbb/unarchive.c +++ b/libbb/unarchive.c @@ -22,10 +22,13 @@ #include #include #include +#include #include #include #include #include +#include +#include #include "libbb.h" @@ -436,6 +439,42 @@ free_header_ar(file_header_t *ar_entry) free(ar_entry); } +static char uname_cache[32] = ""; +static uid_t uid_cache; + +static bool update_unamecache(char *uname) { + struct passwd *passwd; + if (!uname) + return FALSE; + if (!uname_cache[0] && strcmp(uname_cache, uname) == 0) + return TRUE; + passwd = getpwnam(uname); + if (passwd) { + uid_cache = passwd->pw_uid; + strncpy(uname, uname_cache, 32); + return TRUE; + } + return FALSE; +} + +static char gname_cache[32] = ""; +static gid_t gid_cache; + +static bool update_gnamecache(char *gname) { + struct group *group; + if (!gname) + return FALSE; + if (!gname_cache[0] && strcmp(gname_cache, gname) == 0) + return TRUE; + group = getgrnam(gname); + if (group) { + gid_cache = group->gr_gid; + strncpy(gname, gname_cache, 32); + return TRUE; + } + return FALSE; +} + static file_header_t * get_header_tar(FILE *tar_stream) @@ -515,8 +554,14 @@ get_header_tar(FILE *tar_stream) */ tar_entry->mode = 07777 & strtol(tar.formated.mode, NULL, 8); - tar_entry->uid = strtol(tar.formated.uid, NULL, 8); - tar_entry->gid = strtol(tar.formated.gid, NULL, 8); + if (update_unamecache(tar.formated.uname)) + tar_entry->uid = uid_cache; + else + tar_entry->uid = strtol(tar.formated.uid, NULL, 8); + if (update_gnamecache(tar.formated.gname)) + tar_entry->gid = gid_cache; + else + tar_entry->gid = strtol(tar.formated.gid, NULL, 8); tar_entry->size = strtol(tar.formated.size, NULL, 8); tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8); -- cgit v0.9.1