diff options
| -rw-r--r-- | src/basic/cap-list.c | 131 | ||||
| -rw-r--r-- | src/basic/cap-list.h | 27 | ||||
| -rw-r--r-- | src/basic/cap-to-name.awk | 9 | ||||
| -rwxr-xr-x | src/basic/generate-cap-list.sh | 5 | ||||
| -rw-r--r-- | src/basic/meson.build | 23 |
5 files changed, 185 insertions, 10 deletions
diff --git a/src/basic/cap-list.c b/src/basic/cap-list.c new file mode 100644 index 000000000..124641f94 --- /dev/null +++ b/src/basic/cap-list.c @@ -0,0 +1,131 @@ +/*** + This file is part of systemd. + + Copyright 2014 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <string.h> + +#include "alloc-util.h" +#include "capability-util.h" +#include "cap-list.h" +#include "extract-word.h" +#include "macro.h" +#include "missing.h" +#include "parse-util.h" +#include "util.h" + +static const struct capability_name* lookup_capability(register const char *str, register GPERF_LEN_TYPE len); + +#include "cap-from-name.h" +#include "cap-to-name.h" + +const char *capability_to_name(int id) { + + if (id < 0) + return NULL; + + if (id >= (int) ELEMENTSOF(capability_names)) + return NULL; + + return capability_names[id]; +} + +int capability_from_name(const char *name) { + const struct capability_name *sc; + int r, i; + + assert(name); + + /* Try to parse numeric capability */ + r = safe_atoi(name, &i); + if (r >= 0 && i >= 0) + return i; + + /* Try to parse string capability */ + sc = lookup_capability(name, strlen(name)); + if (!sc) + return -EINVAL; + + return sc->id; +} + +int capability_list_length(void) { + return (int) ELEMENTSOF(capability_names); +} + +int capability_set_to_string_alloc(uint64_t set, char **s) { + _cleanup_free_ char *str = NULL; + unsigned long i; + size_t allocated = 0, n = 0; + + assert(s); + + for (i = 0; i < cap_last_cap(); i++) + if (set & (UINT64_C(1) << i)) { + const char *p; + size_t add; + + p = capability_to_name(i); + if (!p) + return -EINVAL; + + add = strlen(p); + + if (!GREEDY_REALLOC0(str, allocated, n + add + 2)) + return -ENOMEM; + + strcpy(mempcpy(str + n, p, add), " "); + n += add + 1; + } + + if (n != 0) + str[n - 1] = '\0'; + + *s = str; + str = NULL; + + return 0; +} + +int capability_set_from_string(const char *s, uint64_t *set) { + uint64_t val = 0; + const char *p; + + assert(set); + + for (p = s;;) { + _cleanup_free_ char *word = NULL; + int r; + + r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES); + if (r == -ENOMEM) + return r; + if (r <= 0) + break; + + r = capability_from_name(word); + if (r < 0) + continue; + + val |= ((uint64_t) UINT64_C(1)) << (uint64_t) r; + } + + *set = val; + + return 0; +} diff --git a/src/basic/cap-list.h b/src/basic/cap-list.h new file mode 100644 index 000000000..f9f6b70d8 --- /dev/null +++ b/src/basic/cap-list.h @@ -0,0 +1,27 @@ +#pragma once + +/*** + This file is part of systemd. + + Copyright 2014 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +const char *capability_to_name(int id); +int capability_from_name(const char *name); +int capability_list_length(void); + +int capability_set_to_string_alloc(uint64_t set, char **s); +int capability_set_from_string(const char *s, uint64_t *set); diff --git a/src/basic/cap-to-name.awk b/src/basic/cap-to-name.awk new file mode 100644 index 000000000..402a78202 --- /dev/null +++ b/src/basic/cap-to-name.awk @@ -0,0 +1,9 @@ +BEGIN{ + print "static const char* const capability_names[] = { " +} +{ + printf " [%s] = \"%s\",\n", $1, tolower($1) +} +END{ + print "};" +} diff --git a/src/basic/generate-cap-list.sh b/src/basic/generate-cap-list.sh new file mode 100755 index 000000000..0678bb5a3 --- /dev/null +++ b/src/basic/generate-cap-list.sh @@ -0,0 +1,5 @@ +#!/bin/sh -eu + +$1 -dM -include linux/capability.h -I../src/shared -include "$2" -include "$3" - </dev/null | \ + awk '/^#define[ \t]+CAP_[A-Z_]+[ \t]+/ { print $2; }' | \ + grep -v CAP_LAST_CAP diff --git a/src/basic/meson.build b/src/basic/meson.build index 7aff69b11..10acb9aef 100644 --- a/src/basic/meson.build +++ b/src/basic/meson.build @@ -210,6 +210,8 @@ basic_sources_plain = files(''' capability-util.c capability-util.h cgroup-util.c + cap-list.c + cap-list.h cgroup-util.h conf-files.c conf-files.h @@ -338,7 +340,7 @@ missing_h = files('missing.h') generate_gperfs = find_program('generate-gperfs.py') -#if 0 /// elogind has only the errno list. +#if 0 /// elogind has only the cap and errno list. # generate_af_list = find_program('generate-af-list.sh') # af_list_txt = custom_target( # 'af-list.txt', @@ -352,15 +354,15 @@ generate_gperfs = find_program('generate-gperfs.py') # output : 'arphrd-list.txt', # command : [generate_arphrd_list, cpp], # capture : true) -# -# generate_cap_list = find_program('generate-cap-list.sh') -# cap_list_txt = custom_target( -# 'cap-list.txt', -# output : 'cap-list.txt', -# command : [generate_cap_list, cpp, config_h, missing_h], -# capture : true) #endif // 0 +generate_cap_list = find_program('generate-cap-list.sh') +cap_list_txt = custom_target( + 'cap-list.txt', + output : 'cap-list.txt', + command : [generate_cap_list, cpp, config_h, missing_h], + capture : true) + generate_errno_list = find_program('generate-errno-list.sh') errno_list_txt = custom_target( 'errno-list.txt', @@ -369,13 +371,14 @@ errno_list_txt = custom_target( capture : true) generated_gperf_headers = [] -#if 0 /// elogind has only the errno list. +#if 0 /// elogind has only the cap and errno list. # foreach item : [['af', af_list_txt, 'af', ''], # ['arphrd', arphrd_list_txt, 'arphrd', 'ARPHRD_'], # ['cap', cap_list_txt, 'capability', ''], # ['errno', errno_list_txt, 'errno', '']] #else -foreach item : [['errno', errno_list_txt, 'errno', '']] +foreach item : [['cap', cap_list_txt, 'capability', ''], + ['errno', errno_list_txt, 'errno', '']] #endif // 0 fname = '@0@-from-name.gperf'.format(item[0]) |