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util.c
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util.c
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/*
* Copyright 2011 Jeff Garzik
* Copyright 2009 Red Hat, Inc.
*
* 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.
*
* 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "autotools-config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <curl/curl.h>
#include "server.h"
void applog(int prio, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (use_syslog) {
vsyslog(prio, fmt, ap);
} else {
char *f = NULL;
struct timeval tv = { };
struct tm tm;
gettimeofday(&tv, NULL);
gmtime_r(&tv.tv_sec, &tm);
if (asprintf(&f, "[%d-%02d-%02d %02d:%02d:%02.6f] %s\n",
tm.tm_year + 1900,
tm.tm_mon + 1,
tm.tm_mday,
tm.tm_hour,
tm.tm_min, tm.tm_sec + tv.tv_usec / 1000000.0,
fmt) > 0)
vfprintf(stderr, f, ap); /* atomic write to stderr */
free(f);
}
va_end(ap);
}
int write_pid_file(const char *pid_fn)
{
char str[32], *s;
size_t bytes;
int fd;
struct flock lock;
int err;
/* build file data */
sprintf(str, "%u\n", (unsigned int) getpid());
/* open non-exclusively (works on NFS v2) */
fd = open(pid_fn, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd < 0) {
err = errno;
applog(LOG_ERR, "Cannot open PID file %s: %s",
pid_fn, strerror(err));
return -err;
}
/* lock */
memset(&lock, 0, sizeof(lock));
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_SETLK, &lock) != 0) {
err = errno;
if (err == EAGAIN) {
applog(LOG_ERR, "PID file %s is already locked",
pid_fn);
} else {
applog(LOG_ERR, "Cannot lock PID file %s: %s",
pid_fn, strerror(err));
}
close(fd);
return -err;
}
/* write file data */
bytes = strlen(str);
s = str;
while (bytes > 0) {
ssize_t rc = write(fd, s, bytes);
if (rc < 0) {
err = errno;
applog(LOG_ERR, "PID number write failed: %s",
strerror(err));
goto err_out;
}
bytes -= rc;
s += rc;
}
/* make sure file data is written to disk */
if (fsync(fd) < 0) {
err = errno;
applog(LOG_ERR, "PID file fsync failed: %s", strerror(err));
goto err_out;
}
return fd;
err_out:
unlink(pid_fn);
close(fd);
return -err;
}
void syslogerr(const char *prefix)
{
applog(LOG_ERR, "%s: %s", prefix, strerror(errno));
}
int fsetflags(const char *prefix, int fd, int or_flags)
{
int flags, old_flags, rc;
/* get current flags */
old_flags = fcntl(fd, F_GETFL);
if (old_flags < 0) {
applog(LOG_ERR, "%s F_GETFL: %s", prefix, strerror(errno));
return -errno;
}
/* add or_flags */
rc = 0;
flags = old_flags | or_flags;
/* set new flags */
if (flags != old_flags)
if (fcntl(fd, F_SETFL, flags) < 0) {
applog(LOG_ERR, "%s F_SETFL: %s", prefix,
strerror(errno));
rc = -errno;
}
return rc;
}
struct data_buffer {
void *buf;
size_t len;
};
struct upload_buffer {
const void *buf;
size_t len;
};
static void databuf_free(struct data_buffer *db)
{
if (!db)
return;
free(db->buf);
memset(db, 0, sizeof(*db));
}
static size_t all_data_cb(const void *ptr, size_t size, size_t nmemb,
void *user_data)
{
struct data_buffer *db = user_data;
size_t len = size * nmemb;
size_t oldlen, newlen;
void *newmem;
static const unsigned char zero;
oldlen = db->len;
newlen = oldlen + len;
newmem = realloc(db->buf, newlen + 1);
if (!newmem)
return 0;
db->buf = newmem;
db->len = newlen;
memcpy(db->buf + oldlen, ptr, len);
memcpy(db->buf + newlen, &zero, 1); /* null terminate */
return len;
}
static size_t upload_data_cb(void *ptr, size_t size, size_t nmemb,
void *user_data)
{
struct upload_buffer *ub = user_data;
int len = size * nmemb;
if (len > ub->len)
len = ub->len;
if (len) {
memcpy(ptr, ub->buf, len);
ub->buf += len;
ub->len -= len;
}
return len;
}
json_t *json_rpc_call(CURL *curl, const char *url,
const char *userpass, const char *rpc_req)
{
json_t *val, *err_val, *res_val;
int rc;
struct data_buffer all_data = { };
struct upload_buffer upload_data;
json_error_t err = { };
struct curl_slist *headers = NULL;
char len_hdr[64];
char curl_err_str[CURL_ERROR_SIZE];
/* it is assumed that 'curl' is freshly [re]initialized at this pt */
if (debugging > 1)
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 1);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, all_data_cb);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &all_data);
curl_easy_setopt(curl, CURLOPT_READFUNCTION, upload_data_cb);
curl_easy_setopt(curl, CURLOPT_READDATA, &upload_data);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_err_str);
if (userpass) {
curl_easy_setopt(curl, CURLOPT_USERPWD, userpass);
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
}
curl_easy_setopt(curl, CURLOPT_POST, 1);
if (debugging > 1)
printf("JSON protocol request:\n%s\n", rpc_req);
upload_data.buf = rpc_req;
upload_data.len = strlen(rpc_req);
sprintf(len_hdr, "Content-Length: %lu",
(unsigned long) upload_data.len);
headers = curl_slist_append(headers,
"Content-type: application/json");
headers = curl_slist_append(headers, len_hdr);
headers = curl_slist_append(headers, "Expect:"); /* disable Expect hdr*/
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
rc = curl_easy_perform(curl);
if (rc) {
applog(LOG_ERR, "HTTP request failed: %s", curl_err_str);
goto err_out;
}
val = JSON_LOADS(all_data.buf, &err);
if (!val) {
applog(LOG_ERR, "JSON decode failed(%d): %s", err.line, err.text);
goto err_out;
}
if (debugging > 1) {
char *s = json_dumps(val, JSON_INDENT(3));
printf("JSON protocol response:\n%s\n", s);
free(s);
}
/* JSON-RPC valid response returns a non-null 'result',
* and a null 'error'.
*/
res_val = json_object_get(val, "result");
err_val = json_object_get(val, "error");
if (!res_val || json_is_null(res_val) ||
(err_val && !json_is_null(err_val))) {
char *s;
if (err_val)
s = json_dumps(err_val, JSON_INDENT(3));
else
s = strdup("(unknown reason)");
applog(LOG_ERR, "JSON-RPC call failed: %s", s);
free(s);
goto err_out;
}
databuf_free(&all_data);
curl_slist_free_all(headers);
curl_easy_reset(curl);
return val;
err_out:
databuf_free(&all_data);
curl_slist_free_all(headers);
curl_easy_reset(curl);
return NULL;
}
char *bin2hex(unsigned char *p, size_t len)
{
int i;
char *s = malloc((len * 2) + 1);
if (!s)
return NULL;
for (i = 0; i < len; i++)
sprintf(s + (i * 2), "%02x", (unsigned int) p[i]);
return s;
}
bool hex2bin(unsigned char *p, const char *hexstr, size_t len)
{
while (*hexstr && len) {
char hex_byte[3];
unsigned int v;
if (!hexstr[1]) {
applog(LOG_ERR, "hex2bin str truncated");
return false;
}
hex_byte[0] = hexstr[0];
hex_byte[1] = hexstr[1];
hex_byte[2] = 0;
if (sscanf(hex_byte, "%x", &v) != 1) {
applog(LOG_ERR, "hex2bin sscanf '%s' failed",
hex_byte);
return false;
}
*p = (unsigned char) v;
p++;
hexstr += 2;
len--;
}
return (len == 0 && *hexstr == 0) ? true : false;
}
/* gbase64.c - Base64 encoding/decoding
*
* Copyright (C) 2006 Alexander Larsson <[email protected]>
* Copyright (C) 2000-2003 Ximian Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* This is based on code in camel, written by:
* Michael Zucchi <[email protected]>
* Jeffrey Stedfast <[email protected]>
*/
/**
* SECTION:base64
* @title: Base64 Encoding
* @short_description: encodes and decodes data in Base64 format
*
* Base64 is an encoding that allows a sequence of arbitrary bytes to be
* encoded as a sequence of printable ASCII characters. For the definition
* of Base64, see <ulink url="http://www.ietf.org/rfc/rfc1421.txt">RFC
* 1421</ulink> or <ulink url="http://www.ietf.org/rfc/rfc2045.txt">RFC
* 2045</ulink>. Base64 is most commonly used as a MIME transfer encoding
* for email.
*
* GLib supports incremental encoding using g_base64_encode_step() and
* g_base64_encode_close(). Incremental decoding can be done with
* g_base64_decode_step(). To encode or decode data in one go, use
* g_base64_encode() or g_base64_decode(). To avoid memory allocation when
* decoding, you can use g_base64_decode_inplace().
*
* Support for Base64 encoding has been added in GLib 2.12.
*/
static const char base64_alphabet[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const unsigned char mime_base64_rank[256] = {
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};
/**
* g_base64_decode_step:
* @in: binary input data
* @len: max length of @in data to decode
* @out: output buffer
* @state: Saved state between steps, initialize to 0
* @save: Saved state between steps, initialize to 0
*
* Incrementally decode a sequence of binary data from its Base-64 stringified
* representation. By calling this function multiple times you can convert
* data in chunks to avoid having to have the full encoded data in memory.
*
* The output buffer must be large enough to fit all the data that will
* be written to it. Since base64 encodes 3 bytes in 4 chars you need
* at least: (@len / 4) * 3 + 3 bytes (+ 3 may be needed in case of non-zero
* state).
*
* Return value: The number of bytes of output that was written
*
* Since: 2.12
**/
static size_t
g_base64_decode_step (const char *in,
size_t len,
unsigned char *out,
int *state,
unsigned int *save)
{
const unsigned char *inptr;
unsigned char *outptr;
const unsigned char *inend;
unsigned char c, rank;
unsigned char last[2];
unsigned int v;
int i;
if (len <= 0)
return 0;
inend = (const unsigned char *)in+len;
outptr = out;
/* convert 4 base64 bytes to 3 normal bytes */
v=*save;
i=*state;
inptr = (const unsigned char *)in;
last[0] = last[1] = 0;
while (inptr < inend)
{
c = *inptr++;
rank = mime_base64_rank [c];
if (rank != 0xff)
{
last[1] = last[0];
last[0] = c;
v = (v<<6) | rank;
i++;
if (i==4)
{
*outptr++ = v>>16;
if (last[1] != '=')
*outptr++ = v>>8;
if (last[0] != '=')
*outptr++ = v;
i=0;
}
}
}
*save = v;
*state = i;
return outptr - out;
}
/**
* g_base64_decode:
* @text: zero-terminated string with base64 text to decode
* @out_len: The length of the decoded data is written here
*
* Decode a sequence of Base-64 encoded text into binary data
*
* Return value: a newly allocated buffer containing the binary data
* that @text represents. The returned buffer must
* be freed with g_free().
*
* Since: 2.12
*/
unsigned char *
g_base64_decode (const char *text,
size_t *out_len)
{
unsigned char *ret;
size_t input_length;
int state = 0;
unsigned int save = 0;
input_length = strlen (text);
/* We can use a smaller limit here, since we know the saved state is 0,
+1 used to avoid calling calloc(0), and hence retruning NULL */
ret = calloc(1, ((input_length / 4) * 3 + 1));
*out_len = g_base64_decode_step (text, input_length, ret, &state, &save);
return ret;
}