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freebsd-skq/usr.sbin/pkg/config.c
bapt 8286a6069a Import libucl 0.4.0 
Adapt pkg(7) to the new libucl API
2014-04-22 22:02:06 +00:00

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/*-
* Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2013 Bryan Drewery <bdrewery@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/elf_common.h>
#include <sys/endian.h>
#include <sys/types.h>
#include <assert.h>
#include <dirent.h>
#include <ucl.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <gelf.h>
#include <inttypes.h>
#include <paths.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include "elf_tables.h"
#include "config.h"
#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
struct config_value {
char *value;
STAILQ_ENTRY(config_value) next;
};
struct config_entry {
uint8_t type;
const char *key;
const char *val;
char *value;
STAILQ_HEAD(, config_value) *list;
bool envset;
bool main_only; /* Only set in pkg.conf. */
};
static struct config_entry c[] = {
[PACKAGESITE] = {
PKG_CONFIG_STRING,
"PACKAGESITE",
URL_SCHEME_PREFIX "http://pkg.FreeBSD.org/${ABI}/latest",
NULL,
NULL,
false,
false,
},
[ABI] = {
PKG_CONFIG_STRING,
"ABI",
NULL,
NULL,
NULL,
false,
true,
},
[MIRROR_TYPE] = {
PKG_CONFIG_STRING,
"MIRROR_TYPE",
"SRV",
NULL,
NULL,
false,
false,
},
[ASSUME_ALWAYS_YES] = {
PKG_CONFIG_BOOL,
"ASSUME_ALWAYS_YES",
"NO",
NULL,
NULL,
false,
true,
},
[SIGNATURE_TYPE] = {
PKG_CONFIG_STRING,
"SIGNATURE_TYPE",
NULL,
NULL,
NULL,
false,
false,
},
[FINGERPRINTS] = {
PKG_CONFIG_STRING,
"FINGERPRINTS",
NULL,
NULL,
NULL,
false,
false,
},
[REPOS_DIR] = {
PKG_CONFIG_LIST,
"REPOS_DIR",
NULL,
NULL,
NULL,
false,
true,
},
};
static const char *
elf_corres_to_string(struct _elf_corres *m, int e)
{
int i;
for (i = 0; m[i].string != NULL; i++)
if (m[i].elf_nb == e)
return (m[i].string);
return ("unknown");
}
static const char *
aeabi_parse_arm_attributes(void *data, size_t length)
{
uint32_t sect_len;
uint8_t *section = data;
#define MOVE(len) do { \
assert(length >= (len)); \
section += (len); \
length -= (len); \
} while (0)
if (length == 0 || *section != 'A')
return (NULL);
MOVE(1);
/* Read the section length */
if (length < sizeof(sect_len))
return (NULL);
memcpy(&sect_len, section, sizeof(sect_len));
/*
* The section length should be no longer than the section it is within
*/
if (sect_len > length)
return (NULL);
MOVE(sizeof(sect_len));
/* Skip the vendor name */
while (length != 0) {
if (*section == '\0')
break;
MOVE(1);
}
if (length == 0)
return (NULL);
MOVE(1);
while (length != 0) {
uint32_t tag_length;
switch(*section) {
case 1: /* Tag_File */
MOVE(1);
if (length < sizeof(tag_length))
return (NULL);
memcpy(&tag_length, section, sizeof(tag_length));
break;
case 2: /* Tag_Section */
case 3: /* Tag_Symbol */
default:
return (NULL);
}
/* At least space for the tag and size */
if (tag_length <= 5)
return (NULL);
tag_length--;
/* Check the tag fits */
if (tag_length > length)
return (NULL);
#define MOVE_TAG(len) do { \
assert(tag_length >= (len)); \
MOVE(len); \
tag_length -= (len); \
} while(0)
MOVE(sizeof(tag_length));
tag_length -= sizeof(tag_length);
while (tag_length != 0) {
uint8_t tag;
assert(tag_length >= length);
tag = *section;
MOVE_TAG(1);
/*
* These tag values come from:
*
* Addenda to, and Errata in, the ABI for the
* ARM Architecture. Release 2.08, section 2.3.
*/
if (tag == 6) { /* == Tag_CPU_arch */
uint8_t val;
val = *section;
/*
* We don't support values that require
* more than one byte.
*/
if (val & (1 << 7))
return (NULL);
/* We have an ARMv4 or ARMv5 */
if (val <= 5)
return ("arm");
else /* We have an ARMv6+ */
return ("armv6");
} else if (tag == 4 || tag == 5 || tag == 32 ||
tag == 65 || tag == 67) {
while (*section != '\0' && length != 0)
MOVE_TAG(1);
if (tag_length == 0)
return (NULL);
/* Skip the last byte */
MOVE_TAG(1);
} else if ((tag >= 7 && tag <= 31) || tag == 34 ||
tag == 36 || tag == 38 || tag == 42 || tag == 44 ||
tag == 64 || tag == 66 || tag == 68 || tag == 70) {
/* Skip the uleb128 data */
while (*section & (1 << 7) && length != 0)
MOVE_TAG(1);
if (tag_length == 0)
return (NULL);
/* Skip the last byte */
MOVE_TAG(1);
} else
return (NULL);
#undef MOVE_TAG
}
break;
}
return (NULL);
#undef MOVE
}
static int
pkg_get_myabi(char *dest, size_t sz)
{
Elf *elf;
Elf_Data *data;
Elf_Note note;
Elf_Scn *scn;
char *src, *osname;
const char *arch, *abi, *fpu, *endian_corres_str;
const char *wordsize_corres_str;
GElf_Ehdr elfhdr;
GElf_Shdr shdr;
int fd, i, ret;
uint32_t version;
version = 0;
ret = -1;
scn = NULL;
abi = NULL;
if (elf_version(EV_CURRENT) == EV_NONE) {
warnx("ELF library initialization failed: %s",
elf_errmsg(-1));
return (-1);
}
if ((fd = open(_PATH_BSHELL, O_RDONLY)) < 0) {
warn("open()");
return (-1);
}
if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
ret = -1;
warnx("elf_begin() failed: %s.", elf_errmsg(-1));
goto cleanup;
}
if (gelf_getehdr(elf, &elfhdr) == NULL) {
ret = -1;
warn("getehdr() failed: %s.", elf_errmsg(-1));
goto cleanup;
}
while ((scn = elf_nextscn(elf, scn)) != NULL) {
if (gelf_getshdr(scn, &shdr) != &shdr) {
ret = -1;
warn("getshdr() failed: %s.", elf_errmsg(-1));
goto cleanup;
}
if (shdr.sh_type == SHT_NOTE)
break;
}
if (scn == NULL) {
ret = -1;
warn("failed to get the note section");
goto cleanup;
}
data = elf_getdata(scn, NULL);
src = data->d_buf;
for (;;) {
memcpy(&note, src, sizeof(Elf_Note));
src += sizeof(Elf_Note);
if (note.n_type == NT_VERSION)
break;
src += note.n_namesz + note.n_descsz;
}
osname = src;
src += roundup2(note.n_namesz, 4);
if (elfhdr.e_ident[EI_DATA] == ELFDATA2MSB)
version = be32dec(src);
else
version = le32dec(src);
for (i = 0; osname[i] != '\0'; i++)
osname[i] = (char)tolower(osname[i]);
wordsize_corres_str = elf_corres_to_string(wordsize_corres,
(int)elfhdr.e_ident[EI_CLASS]);
arch = elf_corres_to_string(mach_corres, (int) elfhdr.e_machine);
snprintf(dest, sz, "%s:%d",
osname, version / 100000);
ret = 0;
switch (elfhdr.e_machine) {
case EM_ARM:
endian_corres_str = elf_corres_to_string(endian_corres,
(int)elfhdr.e_ident[EI_DATA]);
/* FreeBSD doesn't support the hard-float ABI yet */
fpu = "softfp";
if ((elfhdr.e_flags & 0xFF000000) != 0) {
const char *sh_name = NULL;
size_t shstrndx;
/* This is an EABI file, the conformance level is set */
abi = "eabi";
/* Find which TARGET_ARCH we are building for. */
elf_getshdrstrndx(elf, &shstrndx);
while ((scn = elf_nextscn(elf, scn)) != NULL) {
sh_name = NULL;
if (gelf_getshdr(scn, &shdr) != &shdr) {
scn = NULL;
break;
}
sh_name = elf_strptr(elf, shstrndx,
shdr.sh_name);
if (sh_name == NULL)
continue;
if (strcmp(".ARM.attributes", sh_name) == 0)
break;
}
if (scn != NULL && sh_name != NULL) {
data = elf_getdata(scn, NULL);
/*
* Prior to FreeBSD 10.0 libelf would return
* NULL from elf_getdata on the .ARM.attributes
* section. As this was the first release to
* get armv6 support assume a NULL value means
* arm.
*
* This assumption can be removed when 9.x
* is unsupported.
*/
if (data != NULL) {
arch = aeabi_parse_arm_attributes(
data->d_buf, data->d_size);
if (arch == NULL) {
ret = 1;
warn("unknown ARM ARCH");
goto cleanup;
}
}
} else {
ret = 1;
warn("Unable to find the .ARM.attributes "
"section");
goto cleanup;
}
} else if (elfhdr.e_ident[EI_OSABI] != ELFOSABI_NONE) {
/*
* EABI executables all have this field set to
* ELFOSABI_NONE, therefore it must be an oabi file.
*/
abi = "oabi";
} else {
ret = 1;
warn("unknown ARM ABI");
goto cleanup;
}
snprintf(dest + strlen(dest), sz - strlen(dest),
":%s:%s:%s:%s:%s", arch, wordsize_corres_str,
endian_corres_str, abi, fpu);
break;
case EM_MIPS:
/*
* this is taken from binutils sources:
* include/elf/mips.h
* mapping is figured out from binutils:
* gas/config/tc-mips.c
*/
switch (elfhdr.e_flags & EF_MIPS_ABI) {
case E_MIPS_ABI_O32:
abi = "o32";
break;
case E_MIPS_ABI_N32:
abi = "n32";
break;
default:
if (elfhdr.e_ident[EI_DATA] ==
ELFCLASS32)
abi = "o32";
else if (elfhdr.e_ident[EI_DATA] ==
ELFCLASS64)
abi = "n64";
break;
}
endian_corres_str = elf_corres_to_string(endian_corres,
(int)elfhdr.e_ident[EI_DATA]);
snprintf(dest + strlen(dest), sz - strlen(dest), ":%s:%s:%s:%s",
arch, wordsize_corres_str, endian_corres_str, abi);
break;
default:
snprintf(dest + strlen(dest), sz - strlen(dest), ":%s:%s",
arch, wordsize_corres_str);
}
cleanup:
if (elf != NULL)
elf_end(elf);
close(fd);
return (ret);
}
static void
subst_packagesite(const char *abi)
{
struct sbuf *newval;
const char *variable_string;
const char *oldval;
if (c[PACKAGESITE].value != NULL)
oldval = c[PACKAGESITE].value;
else
oldval = c[PACKAGESITE].val;
if ((variable_string = strstr(oldval, "${ABI}")) == NULL)
return;
newval = sbuf_new_auto();
sbuf_bcat(newval, oldval, variable_string - oldval);
sbuf_cat(newval, abi);
sbuf_cat(newval, variable_string + strlen("${ABI}"));
sbuf_finish(newval);
free(c[PACKAGESITE].value);
c[PACKAGESITE].value = strdup(sbuf_data(newval));
}
static int
boolstr_to_bool(const char *str)
{
if (str != NULL && (strcasecmp(str, "true") == 0 ||
strcasecmp(str, "yes") == 0 || strcasecmp(str, "on") == 0 ||
str[0] == '1'))
return (true);
return (false);
}
static void
config_parse(const ucl_object_t *obj, pkg_conf_file_t conftype)
{
struct sbuf *buf = sbuf_new_auto();
const ucl_object_t *cur, *seq;
ucl_object_iter_t it = NULL, itseq = NULL;
struct config_entry *temp_config;
struct config_value *cv;
const char *key;
int i;
size_t j;
/* Temporary config for configs that may be disabled. */
temp_config = calloc(CONFIG_SIZE, sizeof(struct config_entry));
while ((cur = ucl_iterate_object(obj, &it, true))) {
key = ucl_object_key(cur);
if (key == NULL)
continue;
sbuf_clear(buf);
if (conftype == CONFFILE_PKG) {
for (j = 0; j < strlen(key); ++j)
sbuf_putc(buf, key[j]);
sbuf_finish(buf);
} else if (conftype == CONFFILE_REPO) {
if (strcasecmp(key, "url") == 0)
sbuf_cpy(buf, "PACKAGESITE");
else if (strcasecmp(key, "mirror_type") == 0)
sbuf_cpy(buf, "MIRROR_TYPE");
else if (strcasecmp(key, "signature_type") == 0)
sbuf_cpy(buf, "SIGNATURE_TYPE");
else if (strcasecmp(key, "fingerprints") == 0)
sbuf_cpy(buf, "FINGERPRINTS");
else if (strcasecmp(key, "enabled") == 0) {
if ((cur->type != UCL_BOOLEAN) ||
!ucl_object_toboolean(cur))
goto cleanup;
} else
continue;
sbuf_finish(buf);
}
for (i = 0; i < CONFIG_SIZE; i++) {
if (strcmp(sbuf_data(buf), c[i].key) == 0)
break;
}
/* Silently skip unknown keys to be future compatible. */
if (i == CONFIG_SIZE)
continue;
/* env has priority over config file */
if (c[i].envset)
continue;
/* Parse sequence value ["item1", "item2"] */
switch (c[i].type) {
case PKG_CONFIG_LIST:
if (cur->type != UCL_ARRAY) {
warnx("Skipping invalid array "
"value for %s.\n", c[i].key);
continue;
}
temp_config[i].list =
malloc(sizeof(*temp_config[i].list));
STAILQ_INIT(temp_config[i].list);
while ((seq = ucl_iterate_object(cur, &itseq, true))) {
if (seq->type != UCL_STRING)
continue;
cv = malloc(sizeof(struct config_value));
cv->value =
strdup(ucl_object_tostring(seq));
STAILQ_INSERT_TAIL(temp_config[i].list, cv,
next);
}
break;
case PKG_CONFIG_BOOL:
temp_config[i].value =
strdup(ucl_object_toboolean(cur) ? "yes" : "no");
break;
default:
/* Normal string value. */
temp_config[i].value = strdup(ucl_object_tostring(cur));
break;
}
}
/* Repo is enabled, copy over all settings from temp_config. */
for (i = 0; i < CONFIG_SIZE; i++) {
if (c[i].envset)
continue;
/* Prevent overriding ABI, ASSUME_ALWAYS_YES, etc. */
if (conftype != CONFFILE_PKG && c[i].main_only == true)
continue;
switch (c[i].type) {
case PKG_CONFIG_LIST:
c[i].list = temp_config[i].list;
break;
default:
c[i].value = temp_config[i].value;
break;
}
}
cleanup:
free(temp_config);
sbuf_delete(buf);
}
/*-
* Parse new repo style configs in style:
* Name:
* URL:
* MIRROR_TYPE:
* etc...
*/
static void
parse_repo_file(ucl_object_t *obj)
{
ucl_object_iter_t it = NULL;
const ucl_object_t *cur;
const char *key;
while ((cur = ucl_iterate_object(obj, &it, true))) {
key = ucl_object_key(cur);
if (key == NULL)
continue;
if (cur->type != UCL_OBJECT)
continue;
config_parse(cur, CONFFILE_REPO);
}
}
static int
read_conf_file(const char *confpath, pkg_conf_file_t conftype)
{
struct ucl_parser *p;
ucl_object_t *obj = NULL;
p = ucl_parser_new(0);
if (!ucl_parser_add_file(p, confpath)) {
if (errno != ENOENT)
errx(EXIT_FAILURE, "Unable to parse configuration "
"file %s: %s", confpath, ucl_parser_get_error(p));
ucl_parser_free(p);
/* no configuration present */
return (1);
}
obj = ucl_parser_get_object(p);
if (obj->type != UCL_OBJECT)
warnx("Invalid configuration format, ignoring the "
"configuration file %s", confpath);
else {
if (conftype == CONFFILE_PKG)
config_parse(obj, conftype);
else if (conftype == CONFFILE_REPO)
parse_repo_file(obj);
}
ucl_object_unref(obj);
ucl_parser_free(p);
return (0);
}
static int
load_repositories(const char *repodir)
{
struct dirent *ent;
DIR *d;
char *p;
size_t n;
char path[MAXPATHLEN];
int ret;
ret = 0;
if ((d = opendir(repodir)) == NULL)
return (1);
while ((ent = readdir(d))) {
/* Trim out 'repos'. */
if ((n = strlen(ent->d_name)) <= 5)
continue;
p = &ent->d_name[n - 5];
if (strcmp(p, ".conf") == 0) {
snprintf(path, sizeof(path), "%s%s%s",
repodir,
repodir[strlen(repodir) - 1] == '/' ? "" : "/",
ent->d_name);
if (access(path, F_OK) == 0 &&
read_conf_file(path, CONFFILE_REPO)) {
ret = 1;
goto cleanup;
}
}
}
cleanup:
closedir(d);
return (ret);
}
int
config_init(void)
{
char *val;
int i;
const char *localbase;
char *env_list_item;
char confpath[MAXPATHLEN];
struct config_value *cv;
char abi[BUFSIZ];
for (i = 0; i < CONFIG_SIZE; i++) {
val = getenv(c[i].key);
if (val != NULL) {
c[i].envset = true;
switch (c[i].type) {
case PKG_CONFIG_LIST:
/* Split up comma-separated items from env. */
c[i].list = malloc(sizeof(*c[i].list));
STAILQ_INIT(c[i].list);
for (env_list_item = strtok(val, ",");
env_list_item != NULL;
env_list_item = strtok(NULL, ",")) {
cv =
malloc(sizeof(struct config_value));
cv->value =
strdup(env_list_item);
STAILQ_INSERT_TAIL(c[i].list, cv,
next);
}
break;
default:
c[i].val = val;
break;
}
}
}
/* Read LOCALBASE/etc/pkg.conf first. */
localbase = getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE;
snprintf(confpath, sizeof(confpath), "%s/etc/pkg.conf",
localbase);
if (access(confpath, F_OK) == 0 && read_conf_file(confpath,
CONFFILE_PKG))
goto finalize;
/* Then read in all repos from REPOS_DIR list of directories. */
if (c[REPOS_DIR].list == NULL) {
c[REPOS_DIR].list = malloc(sizeof(*c[REPOS_DIR].list));
STAILQ_INIT(c[REPOS_DIR].list);
cv = malloc(sizeof(struct config_value));
cv->value = strdup("/etc/pkg");
STAILQ_INSERT_TAIL(c[REPOS_DIR].list, cv, next);
cv = malloc(sizeof(struct config_value));
if (asprintf(&cv->value, "%s/etc/pkg/repos", localbase) < 0)
goto finalize;
STAILQ_INSERT_TAIL(c[REPOS_DIR].list, cv, next);
}
STAILQ_FOREACH(cv, c[REPOS_DIR].list, next)
if (load_repositories(cv->value))
goto finalize;
finalize:
if (c[ABI].val == NULL && c[ABI].value == NULL) {
if (pkg_get_myabi(abi, BUFSIZ) != 0)
errx(EXIT_FAILURE, "Failed to determine the system "
"ABI");
c[ABI].val = abi;
}
subst_packagesite(c[ABI].value != NULL ? c[ABI].value : c[ABI].val);
return (0);
}
int
config_string(pkg_config_key k, const char **val)
{
if (c[k].type != PKG_CONFIG_STRING)
return (-1);
if (c[k].value != NULL)
*val = c[k].value;
else
*val = c[k].val;
return (0);
}
int
config_bool(pkg_config_key k, bool *val)
{
const char *value;
if (c[k].type != PKG_CONFIG_BOOL)
return (-1);
*val = false;
if (c[k].value != NULL)
value = c[k].value;
else
value = c[k].val;
if (boolstr_to_bool(value))
*val = true;
return (0);
}
void
config_finish(void) {
int i;
for (i = 0; i < CONFIG_SIZE; i++)
free(c[i].value);
}
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