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mirror of https://github.com/moparisthebest/pacman synced 2024-12-23 00:08:50 -05:00
pacman/lib/libalpm/util.c
Dave Reisner ddbd36103d util: fix line length calc in _alpm_archive_fgets
74274b5dc3 which added the real_line_size to the buffer struct
didn't properly account for what happens when archive_fgets has to loop
more than once to find the end of a line. In most cases, this isn't a
problem, but could potentially cause a longer line such as PGP signature
to be improperly read.

This patch fixes the oversight and focuses on only calculating the line
length when we hit the end of line marker. The effective length is then
calculated via pointer arithmetic as:

  (start_of_last_read + read_length) - start_of_line

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
2012-08-01 08:53:10 -05:00

1293 lines
33 KiB
C

/*
* util.c
*
* Copyright (c) 2006-2012 Pacman Development Team <pacman-dev@archlinux.org>
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
* Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
* Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
* Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
* Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <dirent.h>
#include <time.h>
#include <syslog.h>
#include <errno.h>
#include <limits.h>
#include <sys/wait.h>
#include <locale.h> /* setlocale */
#include <fnmatch.h>
/* libarchive */
#include <archive.h>
#include <archive_entry.h>
#ifdef HAVE_LIBSSL
#include <openssl/md5.h>
#include <openssl/sha.h>
#else
#include "md5.h"
#include "sha2.h"
#endif
/* libalpm */
#include "util.h"
#include "log.h"
#include "alpm.h"
#include "alpm_list.h"
#include "handle.h"
#include "trans.h"
#ifndef HAVE_STRSEP
/** Extracts tokens from a string.
* Replaces strset which is not portable (missing on Solaris).
* Copyright (c) 2001 by François Gouget <fgouget_at_codeweavers.com>
* Modifies str to point to the first character after the token if one is
* found, or NULL if one is not.
* @param str string containing delimited tokens to parse
* @param delim character delimiting tokens in str
* @return pointer to the first token in str if str is not NULL, NULL if
* str is NULL
*/
char* strsep(char** str, const char* delims)
{
char* token;
if(*str==NULL) {
/* No more tokens */
return NULL;
}
token=*str;
while(**str!='\0') {
if(strchr(delims,**str)!=NULL) {
**str='\0';
(*str)++;
return token;
}
(*str)++;
}
/* There is no other token */
*str=NULL;
return token;
}
#endif
int _alpm_makepath(const char *path)
{
return _alpm_makepath_mode(path, 0755);
}
/** Creates a directory, including parents if needed, similar to 'mkdir -p'.
* @param path directory path to create
* @param mode permission mode for created directories
* @return 0 on success, 1 on error
*/
int _alpm_makepath_mode(const char *path, mode_t mode)
{
char *ptr, *str;
mode_t oldmask;
int ret = 0;
STRDUP(str, path, return 1);
oldmask = umask(0000);
for(ptr = str; *ptr; ptr++) {
/* detect mid-path condition and zero length paths */
if(*ptr != '/' || ptr == str || ptr[-1] == '/') {
continue;
}
/* temporarily mask the end of the path */
*ptr = '\0';
if(mkdir(str, mode) < 0 && errno != EEXIST) {
ret = 1;
goto done;
}
/* restore path separator */
*ptr = '/';
}
/* end of the string. add the full path. It will already exist when the path
* passed in has a trailing slash. */
if(mkdir(str, mode) < 0 && errno != EEXIST) {
ret = 1;
}
done:
umask(oldmask);
free(str);
return ret;
}
/** Copies a file.
* @param src file path to copy from
* @param dest file path to copy to
* @return 0 on success, 1 on error
*/
int _alpm_copyfile(const char *src, const char *dest)
{
char *buf;
int in, out, ret = 1;
ssize_t nread;
struct stat st;
MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
OPEN(in, src, O_RDONLY);
do {
out = open(dest, O_WRONLY | O_CREAT, 0000);
} while(out == -1 && errno == EINTR);
if(in < 0 || out < 0) {
goto cleanup;
}
if(fstat(in, &st) || fchmod(out, st.st_mode)) {
goto cleanup;
}
/* do the actual file copy */
while((nread = read(in, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
ssize_t nwrite = 0;
if(nread < 0) {
continue;
}
do {
nwrite = write(out, buf + nwrite, nread);
if(nwrite >= 0) {
nread -= nwrite;
} else if(errno != EINTR) {
goto cleanup;
}
} while(nread > 0);
}
ret = 0;
cleanup:
free(buf);
if(in >= 0) {
CLOSE(in);
}
if(out >= 0) {
CLOSE(out);
}
return ret;
}
/** Trim trailing newlines from a string (if any exist).
* @param str a single line of text
* @param len size of str, if known, else 0
* @return the length of the trimmed string
*/
size_t _alpm_strip_newline(char *str, size_t len)
{
if(*str == '\0') {
return 0;
}
if(len == 0) {
len = strlen(str);
}
while(len > 0 && str[len - 1] == '\n') {
len--;
}
str[len] = '\0';
return len;
}
/* Compression functions */
/** Open an archive for reading and perform the necessary boilerplate.
* This takes care of creating the libarchive 'archive' struct, setting up
* compression and format options, opening a file descriptor, setting up the
* buffer size, and performing a stat on the path once opened.
* On error, no file descriptor is opened, and the archive pointer returned
* will be set to NULL.
* @param handle the context handle
* @param path the path of the archive to open
* @param buf space for a stat buffer for the given path
* @param archive pointer to place the created archive object
* @param error error code to set on failure to open archive
* @return -1 on failure, >=0 file descriptor on success
*/
int _alpm_open_archive(alpm_handle_t *handle, const char *path,
struct stat *buf, struct archive **archive, alpm_errno_t error)
{
int fd;
size_t bufsize = ALPM_BUFFER_SIZE;
errno = 0;
if((*archive = archive_read_new()) == NULL) {
RET_ERR(handle, ALPM_ERR_LIBARCHIVE, -1);
}
archive_read_support_compression_all(*archive);
archive_read_support_format_all(*archive);
_alpm_log(handle, ALPM_LOG_DEBUG, "opening archive %s\n", path);
OPEN(fd, path, O_RDONLY);
if(fd < 0) {
_alpm_log(handle, ALPM_LOG_ERROR,
_("could not open file %s: %s\n"), path, strerror(errno));
goto error;
}
if(fstat(fd, buf) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR,
_("could not stat file %s: %s\n"), path, strerror(errno));
goto error;
}
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
if(buf->st_blksize > ALPM_BUFFER_SIZE) {
bufsize = buf->st_blksize;
}
#endif
if(archive_read_open_fd(*archive, fd, bufsize) != ARCHIVE_OK) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not open file %s: %s\n"),
path, archive_error_string(*archive));
goto error;
}
return fd;
error:
archive_read_finish(*archive);
*archive = NULL;
if(fd >= 0) {
CLOSE(fd);
}
RET_ERR(handle, error, -1);
}
/** Unpack a specific file in an archive.
* @param handle the context handle
* @param archive the archive to unpack
* @param prefix where to extract the files
* @param filename a file within the archive to unpack
* @return 0 on success, 1 on failure
*/
int _alpm_unpack_single(alpm_handle_t *handle, const char *archive,
const char *prefix, const char *filename)
{
alpm_list_t *list = NULL;
int ret = 0;
if(filename == NULL) {
return 1;
}
list = alpm_list_add(list, (void *)filename);
ret = _alpm_unpack(handle, archive, prefix, list, 1);
alpm_list_free(list);
return ret;
}
/** Unpack a list of files in an archive.
* @param handle the context handle
* @param path the archive to unpack
* @param prefix where to extract the files
* @param list a list of files within the archive to unpack or NULL for all
* @param breakfirst break after the first entry found
* @return 0 on success, 1 on failure
*/
int _alpm_unpack(alpm_handle_t *handle, const char *path, const char *prefix,
alpm_list_t *list, int breakfirst)
{
int ret = 0;
mode_t oldmask;
struct archive *archive;
struct archive_entry *entry;
struct stat buf;
int fd, cwdfd;
fd = _alpm_open_archive(handle, path, &buf, &archive, ALPM_ERR_PKG_OPEN);
if(fd < 0) {
return 1;
}
oldmask = umask(0022);
/* save the cwd so we can restore it later */
OPEN(cwdfd, ".", O_RDONLY);
if(cwdfd < 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not get current working directory\n"));
}
/* just in case our cwd was removed in the upgrade operation */
if(chdir(prefix) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not change directory to %s (%s)\n"),
prefix, strerror(errno));
ret = 1;
goto cleanup;
}
while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
const char *entryname;
mode_t mode;
entryname = archive_entry_pathname(entry);
/* If specific files were requested, skip entries that don't match. */
if(list) {
char *entry_prefix = strdup(entryname);
char *p = strstr(entry_prefix,"/");
if(p) {
*(p+1) = '\0';
}
char *found = alpm_list_find_str(list, entry_prefix);
free(entry_prefix);
if(!found) {
if(archive_read_data_skip(archive) != ARCHIVE_OK) {
ret = 1;
goto cleanup;
}
continue;
} else {
_alpm_log(handle, ALPM_LOG_DEBUG, "extracting: %s\n", entryname);
}
}
mode = archive_entry_mode(entry);
if(S_ISREG(mode)) {
archive_entry_set_perm(entry, 0644);
} else if(S_ISDIR(mode)) {
archive_entry_set_perm(entry, 0755);
}
/* Extract the archive entry. */
int readret = archive_read_extract(archive, entry, 0);
if(readret == ARCHIVE_WARN) {
/* operation succeeded but a non-critical error was encountered */
_alpm_log(handle, ALPM_LOG_WARNING, _("warning given when extracting %s (%s)\n"),
entryname, archive_error_string(archive));
} else if(readret != ARCHIVE_OK) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not extract %s (%s)\n"),
entryname, archive_error_string(archive));
ret = 1;
goto cleanup;
}
if(breakfirst) {
break;
}
}
cleanup:
umask(oldmask);
archive_read_finish(archive);
CLOSE(fd);
if(cwdfd >= 0) {
if(fchdir(cwdfd) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR,
_("could not restore working directory (%s)\n"), strerror(errno));
}
CLOSE(cwdfd);
}
return ret;
}
/** Determine if there are files in a directory.
* @param handle the context handle
* @param path the full absolute directory path
* @param full_count whether to return an exact count of files
* @return a file count if full_count is != 0, else >0 if directory has
* contents, 0 if no contents, and -1 on error
*/
ssize_t _alpm_files_in_directory(alpm_handle_t *handle, const char *path,
int full_count)
{
ssize_t files = 0;
struct dirent *ent;
DIR *dir = opendir(path);
if(!dir) {
if(errno == ENOTDIR) {
_alpm_log(handle, ALPM_LOG_DEBUG, "%s was not a directory\n", path);
} else {
_alpm_log(handle, ALPM_LOG_DEBUG, "could not read directory %s\n",
path);
}
return -1;
}
while((ent = readdir(dir)) != NULL) {
const char *name = ent->d_name;
if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
continue;
}
files++;
if(!full_count) {
break;
}
}
closedir(dir);
return files;
}
/** Write formatted message to log.
* @param handle the context handle
* @param format formatted string to write out
* @param args formatting arguments
* @return 0 or number of characters written on success, vfprintf return value
* on error
*/
int _alpm_logaction(alpm_handle_t *handle, const char *fmt, va_list args)
{
int ret = 0;
if(handle->usesyslog) {
/* we can't use a va_list more than once, so we need to copy it
* so we can use the original when calling vfprintf below. */
va_list args_syslog;
va_copy(args_syslog, args);
vsyslog(LOG_WARNING, fmt, args_syslog);
va_end(args_syslog);
}
if(handle->logstream) {
time_t t;
struct tm *tm;
t = time(NULL);
tm = localtime(&t);
/* Use ISO-8601 date format */
fprintf(handle->logstream, "[%04d-%02d-%02d %02d:%02d] ",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
tm->tm_hour, tm->tm_min);
ret = vfprintf(handle->logstream, fmt, args);
fflush(handle->logstream);
}
return ret;
}
/** Execute a command with arguments in a chroot.
* @param handle the context handle
* @param cmd command to execute
* @param argv arguments to pass to cmd
* @return 0 on success, 1 on error
*/
int _alpm_run_chroot(alpm_handle_t *handle, const char *cmd, char *const argv[])
{
pid_t pid;
int pipefd[2], cwdfd;
int retval = 0;
/* save the cwd so we can restore it later */
OPEN(cwdfd, ".", O_RDONLY);
if(cwdfd < 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not get current working directory\n"));
}
/* just in case our cwd was removed in the upgrade operation */
if(chdir(handle->root) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not change directory to %s (%s)\n"),
handle->root, strerror(errno));
goto cleanup;
}
_alpm_log(handle, ALPM_LOG_DEBUG, "executing \"%s\" under chroot \"%s\"\n",
cmd, handle->root);
/* Flush open fds before fork() to avoid cloning buffers */
fflush(NULL);
if(pipe(pipefd) == -1) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not create pipe (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
/* fork- parent and child each have seperate code blocks below */
pid = fork();
if(pid == -1) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not fork a new process (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
if(pid == 0) {
/* this code runs for the child only (the actual chroot/exec) */
CLOSE(1);
CLOSE(2);
while(dup2(pipefd[1], 1) == -1 && errno == EINTR);
while(dup2(pipefd[1], 2) == -1 && errno == EINTR);
CLOSE(pipefd[0]);
CLOSE(pipefd[1]);
/* use fprintf instead of _alpm_log to send output through the parent */
if(chroot(handle->root) != 0) {
fprintf(stderr, _("could not change the root directory (%s)\n"), strerror(errno));
exit(1);
}
if(chdir("/") != 0) {
fprintf(stderr, _("could not change directory to %s (%s)\n"),
"/", strerror(errno));
exit(1);
}
umask(0022);
execv(cmd, argv);
/* execv only returns if there was an error */
fprintf(stderr, _("call to execv failed (%s)\n"), strerror(errno));
exit(1);
} else {
/* this code runs for the parent only (wait on the child) */
int status;
FILE *pipe_file;
CLOSE(pipefd[1]);
pipe_file = fdopen(pipefd[0], "r");
if(pipe_file == NULL) {
CLOSE(pipefd[0]);
retval = 1;
} else {
while(!feof(pipe_file)) {
char line[PATH_MAX];
if(fgets(line, PATH_MAX, pipe_file) == NULL)
break;
alpm_logaction(handle, "%s", line);
EVENT(handle, ALPM_EVENT_SCRIPTLET_INFO, line, NULL);
}
fclose(pipe_file);
}
while(waitpid(pid, &status, 0) == -1) {
if(errno != EINTR) {
_alpm_log(handle, ALPM_LOG_ERROR, _("call to waitpid failed (%s)\n"), strerror(errno));
retval = 1;
goto cleanup;
}
}
/* report error from above after the child has exited */
if(retval != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not open pipe (%s)\n"), strerror(errno));
goto cleanup;
}
/* check the return status, make sure it is 0 (success) */
if(WIFEXITED(status)) {
_alpm_log(handle, ALPM_LOG_DEBUG, "call to waitpid succeeded\n");
if(WEXITSTATUS(status) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("command failed to execute correctly\n"));
retval = 1;
}
}
}
cleanup:
if(cwdfd >= 0) {
if(fchdir(cwdfd) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR,
_("could not restore working directory (%s)\n"), strerror(errno));
}
CLOSE(cwdfd);
}
return retval;
}
/** Run ldconfig in a chroot.
* @param handle the context handle
* @return 0 on success, 1 on error
*/
int _alpm_ldconfig(alpm_handle_t *handle)
{
char line[PATH_MAX];
_alpm_log(handle, ALPM_LOG_DEBUG, "running ldconfig\n");
snprintf(line, PATH_MAX, "%setc/ld.so.conf", handle->root);
if(access(line, F_OK) == 0) {
snprintf(line, PATH_MAX, "%ssbin/ldconfig", handle->root);
if(access(line, X_OK) == 0) {
char arg0[32];
char *argv[] = { arg0, NULL };
strcpy(arg0, "ldconfig");
return _alpm_run_chroot(handle, "/sbin/ldconfig", argv);
}
}
return 0;
}
/** Helper function for comparing strings using the alpm "compare func"
* signature.
* @param s1 first string to be compared
* @param s2 second string to be compared
* @return 0 if strings are equal, positive int if first unequal character
* has a greater value in s1, negative if it has a greater value in s2
*/
int _alpm_str_cmp(const void *s1, const void *s2)
{
return strcmp(s1, s2);
}
/** Find a filename in a registered alpm cachedir.
* @param handle the context handle
* @param filename name of file to find
* @return malloced path of file, NULL if not found
*/
char *_alpm_filecache_find(alpm_handle_t *handle, const char *filename)
{
char path[PATH_MAX];
char *retpath;
alpm_list_t *i;
struct stat buf;
/* Loop through the cache dirs until we find a matching file */
for(i = handle->cachedirs; i; i = i->next) {
snprintf(path, PATH_MAX, "%s%s", (char *)i->data,
filename);
if(stat(path, &buf) == 0 && S_ISREG(buf.st_mode)) {
retpath = strdup(path);
_alpm_log(handle, ALPM_LOG_DEBUG, "found cached pkg: %s\n", retpath);
return retpath;
}
}
/* package wasn't found in any cachedir */
return NULL;
}
/** Check the alpm cachedirs for existance and find a writable one.
* If no valid cache directory can be found, use /tmp.
* @param handle the context handle
* @return pointer to a writable cache directory.
*/
const char *_alpm_filecache_setup(alpm_handle_t *handle)
{
struct stat buf;
alpm_list_t *i;
char *cachedir;
const char *tmpdir;
/* Loop through the cache dirs until we find a usable directory */
for(i = handle->cachedirs; i; i = i->next) {
cachedir = i->data;
if(stat(cachedir, &buf) != 0) {
/* cache directory does not exist.... try creating it */
_alpm_log(handle, ALPM_LOG_WARNING, _("no %s cache exists, creating...\n"),
cachedir);
if(_alpm_makepath(cachedir) == 0) {
_alpm_log(handle, ALPM_LOG_DEBUG, "using cachedir: %s\n", cachedir);
return cachedir;
}
} else if(!S_ISDIR(buf.st_mode)) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"skipping cachedir, not a directory: %s\n", cachedir);
} else if(_alpm_access(handle, NULL, cachedir, W_OK) != 0) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"skipping cachedir, not writable: %s\n", cachedir);
} else if(!(buf.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH))) {
_alpm_log(handle, ALPM_LOG_DEBUG,
"skipping cachedir, no write bits set: %s\n", cachedir);
} else {
_alpm_log(handle, ALPM_LOG_DEBUG, "using cachedir: %s\n", cachedir);
return cachedir;
}
}
/* we didn't find a valid cache directory. use TMPDIR or /tmp. */
if((tmpdir = getenv("TMPDIR")) && stat(tmpdir, &buf) && S_ISDIR(buf.st_mode)) {
/* TMPDIR was good, we can use it */
} else {
tmpdir = "/tmp";
}
alpm_option_add_cachedir(handle, tmpdir);
cachedir = handle->cachedirs->prev->data;
_alpm_log(handle, ALPM_LOG_DEBUG, "using cachedir: %s\n", cachedir);
_alpm_log(handle, ALPM_LOG_WARNING,
_("couldn't find or create package cache, using %s instead\n"), cachedir);
return cachedir;
}
/** lstat wrapper that treats /path/dirsymlink/ the same as /path/dirsymlink.
* Linux lstat follows POSIX semantics and still performs a dereference on
* the first, and for uses of lstat in libalpm this is not what we want.
* @param path path to file to lstat
* @param buf structure to fill with stat information
* @return the return code from lstat
*/
int _alpm_lstat(const char *path, struct stat *buf)
{
int ret;
size_t len = strlen(path);
/* strip the trailing slash if one exists */
if(len != 0 && path[len - 1] == '/') {
char *newpath = strdup(path);
newpath[len - 1] = '\0';
ret = lstat(newpath, buf);
free(newpath);
} else {
ret = lstat(path, buf);
}
return ret;
}
#ifdef HAVE_LIBSSL
/** Compute the MD5 message digest of a file.
* @param path file path of file to compute MD5 digest of
* @param output string to hold computed MD5 digest
* @return 0 on success, 1 on file open error, 2 on file read error
*/
static int md5_file(const char *path, unsigned char output[16])
{
MD5_CTX ctx;
unsigned char *buf;
ssize_t n;
int fd;
MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
OPEN(fd, path, O_RDONLY);
if(fd < 0) {
free(buf);
return 1;
}
MD5_Init(&ctx);
while((n = read(fd, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
if(n < 0) {
continue;
}
MD5_Update(&ctx, buf, n);
}
CLOSE(fd);
free(buf);
if(n < 0) {
return 2;
}
MD5_Final(output, &ctx);
return 0;
}
/* third param is so we match the PolarSSL definition */
/** Compute the SHA-224 or SHA-256 message digest of a file.
* @param path file path of file to compute SHA2 digest of
* @param output string to hold computed SHA2 digest
* @param is224 use SHA-224 instead of SHA-256
* @return 0 on success, 1 on file open error, 2 on file read error
*/
static int sha2_file(const char *path, unsigned char output[32], int is224)
{
SHA256_CTX ctx;
unsigned char *buf;
ssize_t n;
int fd;
MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
OPEN(fd, path, O_RDONLY);
if(fd < 0) {
free(buf);
return 1;
}
if(is224) {
SHA224_Init(&ctx);
} else {
SHA256_Init(&ctx);
}
while((n = read(fd, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
if(n < 0) {
continue;
}
if(is224) {
SHA224_Update(&ctx, buf, n);
} else {
SHA256_Update(&ctx, buf, n);
}
}
CLOSE(fd);
free(buf);
if(n < 0) {
return 2;
}
if(is224) {
SHA224_Final(output, &ctx);
} else {
SHA256_Final(output, &ctx);
}
return 0;
}
#endif
/** Create a string representing bytes in hexadecimal.
* @param bytes the bytes to represent in hexadecimal
* @param size number of bytes to consider
* @return a NULL terminated string with the hexadecimal representation of
* bytes or NULL on error. This string must be freed.
*/
static char *hex_representation(unsigned char *bytes, size_t size)
{
static const char *hex_digits = "0123456789abcdef";
char *str;
size_t i;
MALLOC(str, 2 * size + 1, return NULL);
for (i = 0; i < size; i++) {
str[2 * i] = hex_digits[bytes[i] >> 4];
str[2 * i + 1] = hex_digits[bytes[i] & 0x0f];
}
str[2 * size] = '\0';
return str;
}
/** Get the md5 sum of file.
* @param filename name of the file
* @return the checksum on success, NULL on error
* @addtogroup alpm_misc
*/
char SYMEXPORT *alpm_compute_md5sum(const char *filename)
{
unsigned char output[16];
ASSERT(filename != NULL, return NULL);
/* defined above for OpenSSL, otherwise defined in md5.h */
if(md5_file(filename, output) > 0) {
return NULL;
}
return hex_representation(output, 16);
}
/** Get the sha256 sum of file.
* @param filename name of the file
* @return the checksum on success, NULL on error
* @addtogroup alpm_misc
*/
char SYMEXPORT *alpm_compute_sha256sum(const char *filename)
{
unsigned char output[32];
ASSERT(filename != NULL, return NULL);
/* defined above for OpenSSL, otherwise defined in sha2.h */
if(sha2_file(filename, output, 0) > 0) {
return NULL;
}
return hex_representation(output, 32);
}
/** Calculates a file's MD5 or SHA2 digest and compares it to an expected value.
* @param filepath path of the file to check
* @param expected hash value to compare against
* @param type digest type to use
* @return 0 if file matches the expected hash, 1 if they do not match, -1 on
* error
*/
int _alpm_test_checksum(const char *filepath, const char *expected,
alpm_pkgvalidation_t type)
{
char *computed;
int ret;
if(type == ALPM_PKG_VALIDATION_MD5SUM) {
computed = alpm_compute_md5sum(filepath);
} else if(type == ALPM_PKG_VALIDATION_SHA256SUM) {
computed = alpm_compute_sha256sum(filepath);
} else {
return -1;
}
if(expected == NULL || computed == NULL) {
ret = -1;
} else if(strcmp(expected, computed) != 0) {
ret = 1;
} else {
ret = 0;
}
FREE(computed);
return ret;
}
/* Note: does NOT handle sparse files on purpose for speed. */
/** TODO.
* Does not handle sparse files on purpose for speed.
* @param a
* @param b
* @return
*/
int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
{
/* ensure we start populating our line buffer at the beginning */
b->line_offset = b->line;
while(1) {
size_t block_remaining;
char *eol;
/* have we processed this entire block? */
if(b->block + b->block_size == b->block_offset) {
int64_t offset;
if(b->ret == ARCHIVE_EOF) {
/* reached end of archive on the last read, now we are out of data */
goto cleanup;
}
/* zero-copy - this is the entire next block of data. */
b->ret = archive_read_data_block(a, (void *)&b->block,
&b->block_size, &offset);
b->block_offset = b->block;
block_remaining = b->block_size;
/* error, cleanup */
if(b->ret < ARCHIVE_OK) {
goto cleanup;
}
} else {
block_remaining = b->block + b->block_size - b->block_offset;
}
/* look through the block looking for EOL characters */
eol = memchr(b->block_offset, '\n', block_remaining);
if(!eol) {
eol = memchr(b->block_offset, '\0', block_remaining);
}
/* allocate our buffer, or ensure our existing one is big enough */
if(!b->line) {
/* set the initial buffer to the read block_size */
CALLOC(b->line, b->block_size + 1, sizeof(char), b->ret = -ENOMEM; goto cleanup);
b->line_size = b->block_size + 1;
b->line_offset = b->line;
} else {
/* note: we know eol > b->block_offset and b->line_offset > b->line,
* so we know the result is unsigned and can fit in size_t */
size_t new = eol ? (size_t)(eol - b->block_offset) : block_remaining;
size_t needed = (size_t)((b->line_offset - b->line) + new + 1);
if(needed > b->max_line_size) {
b->ret = -ERANGE;
goto cleanup;
}
if(needed > b->line_size) {
/* need to realloc + copy data to fit total length */
char *new_line;
CALLOC(new_line, needed, sizeof(char), b->ret = -ENOMEM; goto cleanup);
memcpy(new_line, b->line, b->line_size);
b->line_size = needed;
b->line_offset = new_line + (b->line_offset - b->line);
free(b->line);
b->line = new_line;
}
}
if(eol) {
size_t len = (size_t)(eol - b->block_offset);
memcpy(b->line_offset, b->block_offset, len);
b->line_offset[len] = '\0';
b->block_offset = eol + 1;
b->real_line_size = b->line_offset + len - b->line;
/* this is the main return point; from here you can read b->line */
return ARCHIVE_OK;
} else {
/* we've looked through the whole block but no newline, copy it */
size_t len = (size_t)(b->block + b->block_size - b->block_offset);
memcpy(b->line_offset, b->block_offset, len);
b->line_offset += len;
b->block_offset = b->block + b->block_size;
/* there was no new data, return what is left; saved ARCHIVE_EOF will be
* returned on next call */
if(len == 0) {
b->line_offset[0] = '\0';
b->real_line_size = b->line_offset - b->line;
return ARCHIVE_OK;
}
}
}
cleanup:
{
int ret = b->ret;
FREE(b->line);
memset(b, 0, sizeof(struct archive_read_buffer));
return ret;
}
}
/** Parse a full package specifier.
* @param target package specifier to parse, such as: "pacman-4.0.1-2",
* "pacman-4.01-2/", or "pacman-4.0.1-2/desc"
* @param name to hold package name
* @param version to hold package version
* @param name_hash to hold package name hash
* @return 0 on success, -1 on error
*/
int _alpm_splitname(const char *target, char **name, char **version,
unsigned long *name_hash)
{
/* the format of a db entry is as follows:
* package-version-rel/
* package-version-rel/desc (we ignore the filename portion)
* package name can contain hyphens, so parse from the back- go back
* two hyphens and we have split the version from the name.
*/
const char *pkgver, *end;
if(target == NULL) {
return -1;
}
/* remove anything trailing a '/' */
end = strchr(target, '/');
if(!end) {
end = target + strlen(target);
}
/* do the magic parsing- find the beginning of the version string
* by doing two iterations of same loop to lop off two hyphens */
for(pkgver = end - 1; *pkgver && *pkgver != '-'; pkgver--);
for(pkgver = pkgver - 1; *pkgver && *pkgver != '-'; pkgver--);
if(*pkgver != '-' || pkgver == target) {
return -1;
}
/* copy into fields and return */
if(version) {
if(*version) {
FREE(*version);
}
/* version actually points to the dash, so need to increment 1 and account
* for potential end character */
STRNDUP(*version, pkgver + 1, end - pkgver - 1, return -1);
}
if(name) {
if(*name) {
FREE(*name);
}
STRNDUP(*name, target, pkgver - target, return -1);
if(name_hash) {
*name_hash = _alpm_hash_sdbm(*name);
}
}
return 0;
}
/** Hash the given string to an unsigned long value.
* This is the standard sdbm hashing algorithm.
* @param str string to hash
* @return the hash value of the given string
*/
unsigned long _alpm_hash_sdbm(const char *str)
{
unsigned long hash = 0;
int c;
if(!str) {
return hash;
}
while((c = *str++)) {
hash = c + hash * 65599;
}
return hash;
}
/** Convert a string to a file offset.
* This parses bare positive integers only.
* @param line string to convert
* @return off_t on success, -1 on error
*/
off_t _alpm_strtoofft(const char *line)
{
char *end;
unsigned long long result;
errno = 0;
/* we are trying to parse bare numbers only, no leading anything */
if(!isdigit((unsigned char)line[0])) {
return (off_t)-1;
}
result = strtoull(line, &end, 10);
if(result == 0 && end == line) {
/* line was not a number */
return (off_t)-1;
} else if(result == ULLONG_MAX && errno == ERANGE) {
/* line does not fit in unsigned long long */
return (off_t)-1;
} else if(*end) {
/* line began with a number but has junk left over at the end */
return (off_t)-1;
}
return (off_t)result;
}
/** Parses a date into an alpm_time_t struct.
* @param line date to parse
* @return time struct on success, 0 on error
*/
alpm_time_t _alpm_parsedate(const char *line)
{
char *end;
long long result;
errno = 0;
if(isalpha((unsigned char)line[0])) {
/* initialize to null in case of failure */
struct tm tmp_tm;
memset(&tmp_tm, 0, sizeof(struct tm));
setlocale(LC_TIME, "C");
strptime(line, "%a %b %e %H:%M:%S %Y", &tmp_tm);
setlocale(LC_TIME, "");
return (alpm_time_t)mktime(&tmp_tm);
}
result = strtoll(line, &end, 10);
if(result == 0 && end == line) {
/* line was not a number */
errno = EINVAL;
return 0;
} else if(errno == ERANGE) {
/* line does not fit in long long */
return 0;
} else if(*end) {
/* line began with a number but has junk left over at the end */
errno = EINVAL;
return 0;
}
return (alpm_time_t)result;
}
/** Wrapper around access() which takes a dir and file argument
* separately and generates an appropriate error message.
* If dir is NULL file will be treated as the whole path.
* @param handle an alpm handle
* @param dir directory path ending with and slash
* @param file filename
* @param amode access mode as described in access()
* @return int value returned by access()
*/
int _alpm_access(alpm_handle_t *handle, const char *dir, const char *file, int amode)
{
size_t len = 0;
int ret = 0;
if(dir) {
char *check_path;
len = strlen(dir) + strlen(file) + 1;
CALLOC(check_path, len, sizeof(char), RET_ERR(handle, ALPM_ERR_MEMORY, -1));
snprintf(check_path, len, "%s%s", dir, file);
ret = access(check_path, amode);
free(check_path);
} else {
dir = "";
ret = access(file, amode);
}
if(ret != 0) {
if(amode & R_OK) {
_alpm_log(handle, ALPM_LOG_DEBUG, "\"%s%s\" is not readable: %s\n",
dir, file, strerror(errno));
}
if(amode & W_OK) {
_alpm_log(handle, ALPM_LOG_DEBUG, "\"%s%s\" is not writable: %s\n",
dir, file, strerror(errno));
}
if(amode & X_OK) {
_alpm_log(handle, ALPM_LOG_DEBUG, "\"%s%s\" is not executable: %s\n",
dir, file, strerror(errno));
}
if(amode == F_OK) {
_alpm_log(handle, ALPM_LOG_DEBUG, "\"%s%s\" does not exist: %s\n",
dir, file, strerror(errno));
}
}
return ret;
}
/** Checks whether a string matches a shell wildcard pattern.
* Wrapper around fnmatch.
* @param pattern pattern to match aganist
* @param string string to check against pattern
* @return 0 if string matches pattern, non-zero if they don't match and on
* error
*/
int _alpm_fnmatch(const void *pattern, const void *string)
{
return fnmatch(pattern, string, 0);
}
void _alpm_alloc_fail(size_t size)
{
fprintf(stderr, "alloc failure: could not allocate %zd bytes\n", size);
}
#ifndef HAVE_STRNDUP
/* A quick and dirty implementation derived from glibc */
/** Determines the length of a fixed-size string.
* @param s string to be measured
* @param max maximum number of characters to search for the string end
* @return length of s or max, whichever is smaller
*/
static size_t strnlen(const char *s, size_t max)
{
register const char *p;
for(p = s; *p && max--; ++p);
return (p - s);
}
/** Copies a string.
* Returned string needs to be freed
* @param s string to be copied
* @param n maximum number of characters to copy
* @return pointer to the new string on success, NULL on error
*/
char *strndup(const char *s, size_t n)
{
size_t len = strnlen(s, n);
char *new = (char *) malloc(len + 1);
if(new == NULL)
return NULL;
new[len] = '\0';
return (char *)memcpy(new, s, len);
}
#endif
/* vim: set ts=2 sw=2 noet: */