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common.c
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common.c
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/*
* Utility routines. This file is part of Shairport.
* Copyright (c) James Laird 2013
* The volume to attenuation function vol2attn copyright (c) Mike Brady 2014
* Further changes and additions (c) Mike Brady 2014 -- 2019
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "common.h"
#include <assert.h>
#include <errno.h>
#include <memory.h>
#include <poll.h>
#include <popt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#ifdef COMPILE_FOR_OSX
#include <CoreServices/CoreServices.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif
#ifdef CONFIG_OPENSSL
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#endif
#ifdef CONFIG_POLARSSL
#include "polarssl/ctr_drbg.h"
#include "polarssl/entropy.h"
#include <polarssl/base64.h>
#include <polarssl/md.h>
#include <polarssl/version.h>
#include <polarssl/x509.h>
#if POLARSSL_VERSION_NUMBER >= 0x01030000
#include "polarssl/compat-1.2.h"
#endif
#endif
#ifdef CONFIG_MBEDTLS
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/entropy.h"
#include <mbedtls/base64.h>
#include <mbedtls/md.h>
#include <mbedtls/version.h>
#include <mbedtls/x509.h>
#endif
#ifdef CONFIG_LIBDAEMON
#include <libdaemon/dlog.h>
#else
#include <syslog.h>
#endif
#ifdef CONFIG_ALSA
void set_alsa_out_dev(char *);
#endif
// true if Shairport Sync is supposed to be sending output to the output device, false otherwise
static volatile int requested_connection_state_to_output = 1;
// this stuff is to direct logging to syslog via libdaemon or directly
// alternatively you can direct it to stderr using a command line option
#ifdef CONFIG_LIBDAEMON
static void (*sps_log)(int prio, const char *t, ...) = daemon_log;
#else
static void (*sps_log)(int prio, const char *t, ...) = syslog;
#endif
void do_sps_log(__attribute__((unused)) int prio, const char *t, ...) {
char s[1024];
va_list args;
va_start(args, t);
vsnprintf(s, sizeof(s), t, args);
va_end(args);
fprintf(stderr,"%s\n",s);
}
void log_to_stderr() {
sps_log = do_sps_log;
}
shairport_cfg config;
volatile int debuglev = 0;
sigset_t pselect_sigset;
int usleep_uncancellable(useconds_t usec) {
int response;
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
response = usleep(usec);
pthread_setcancelstate(oldState, NULL);
return response;
}
static uint16_t UDPPortIndex = 0;
void resetFreeUDPPort() {
debug(3, "Resetting UDP Port Suggestion to %u", config.udp_port_base);
UDPPortIndex = 0;
}
uint16_t nextFreeUDPPort() {
if (UDPPortIndex == 0)
UDPPortIndex = config.udp_port_base;
else if (UDPPortIndex == (config.udp_port_base + config.udp_port_range - 1))
UDPPortIndex = config.udp_port_base + 3; // avoid wrapping back to the first three, as they can
// be assigned by resetFreeUDPPort without checking
else
UDPPortIndex++;
return UDPPortIndex;
}
int get_requested_connection_state_to_output() { return requested_connection_state_to_output; }
void set_requested_connection_state_to_output(int v) { requested_connection_state_to_output = v; }
void die(const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char s[1024];
s[0] = 0;
uint64_t time_now = get_absolute_time_in_fp();
uint64_t time_since_start = time_now - fp_time_at_startup;
uint64_t time_since_last_debug_message = time_now - fp_time_at_last_debug_message;
fp_time_at_last_debug_message = time_now;
uint64_t divisor = (uint64_t)1 << 32;
double tss = 1.0 * time_since_start / divisor;
double tsl = 1.0 * time_since_last_debug_message / divisor;
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(s), format, args);
va_end(args);
if ((debuglev) && (config.debugger_show_elapsed_time) && (config.debugger_show_relative_time))
sps_log(LOG_ERR, "|% 20.9f|% 20.9f|*fatal error: %s", tss, tsl, s);
else if ((debuglev) && (config.debugger_show_relative_time))
sps_log(LOG_ERR, "% 20.9f|*fatal error: %s", tsl, s);
else if ((debuglev) && (config.debugger_show_elapsed_time))
sps_log(LOG_ERR, "% 20.9f|*fatal error: %s", tss, s);
else
sps_log(LOG_ERR, "fatal error: %s", s);
pthread_setcancelstate(oldState, NULL);
exit(1);
}
void warn(const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char s[1024];
s[0] = 0;
uint64_t time_now = get_absolute_time_in_fp();
uint64_t time_since_start = time_now - fp_time_at_startup;
uint64_t time_since_last_debug_message = time_now - fp_time_at_last_debug_message;
fp_time_at_last_debug_message = time_now;
uint64_t divisor = (uint64_t)1 << 32;
double tss = 1.0 * time_since_start / divisor;
double tsl = 1.0 * time_since_last_debug_message / divisor;
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(s), format, args);
va_end(args);
if ((debuglev) && (config.debugger_show_elapsed_time) && (config.debugger_show_relative_time))
sps_log(LOG_WARNING, "|% 20.9f|% 20.9f|*warning: %s", tss, tsl, s);
else if ((debuglev) && (config.debugger_show_relative_time))
sps_log(LOG_WARNING, "% 20.9f|*warning: %s", tsl, s);
else if ((debuglev) && (config.debugger_show_elapsed_time))
sps_log(LOG_WARNING, "% 20.9f|*warning: %s", tss, s);
else
sps_log(LOG_WARNING, "%s", s);
pthread_setcancelstate(oldState, NULL);
}
void debug(int level, const char *format, ...) {
if (level > debuglev)
return;
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char s[1024];
s[0] = 0;
uint64_t time_now = get_absolute_time_in_fp();
uint64_t time_since_start = time_now - fp_time_at_startup;
uint64_t time_since_last_debug_message = time_now - fp_time_at_last_debug_message;
fp_time_at_last_debug_message = time_now;
uint64_t divisor = (uint64_t)1 << 32;
double tss = 1.0 * time_since_start / divisor;
double tsl = 1.0 * time_since_last_debug_message / divisor;
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(s), format, args);
va_end(args);
if ((config.debugger_show_elapsed_time) && (config.debugger_show_relative_time))
sps_log(LOG_DEBUG, "|% 20.9f|% 20.9f|%s", tss, tsl, s);
else if (config.debugger_show_relative_time)
sps_log(LOG_DEBUG, "% 20.9f|%s", tsl, s);
else if (config.debugger_show_elapsed_time)
sps_log(LOG_DEBUG, "% 20.9f|%s", tss, s);
else
sps_log(LOG_DEBUG, "%s", s);
pthread_setcancelstate(oldState, NULL);
}
void inform(const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char s[1024];
s[0] = 0;
uint64_t time_now = get_absolute_time_in_fp();
uint64_t time_since_start = time_now - fp_time_at_startup;
uint64_t time_since_last_debug_message = time_now - fp_time_at_last_debug_message;
fp_time_at_last_debug_message = time_now;
uint64_t divisor = (uint64_t)1 << 32;
double tss = 1.0 * time_since_start / divisor;
double tsl = 1.0 * time_since_last_debug_message / divisor;
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(s), format, args);
va_end(args);
if ((debuglev) && (config.debugger_show_elapsed_time) && (config.debugger_show_relative_time))
sps_log(LOG_INFO, "|% 20.9f|% 20.9f|%s", tss, tsl, s);
else if ((debuglev) && (config.debugger_show_relative_time))
sps_log(LOG_INFO, "% 20.9f|%s", tsl, s);
else if ((debuglev) && (config.debugger_show_elapsed_time))
sps_log(LOG_INFO, "% 20.9f|%s", tss, s);
else
sps_log(LOG_INFO, "%s", s);
pthread_setcancelstate(oldState, NULL);
}
// The following two functions are adapted slightly and with thanks from Jonathan Leffler's sample
// code at
// https://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux
int do_mkdir(const char *path, mode_t mode) {
struct stat st;
int status = 0;
if (stat(path, &st) != 0) {
/* Directory does not exist. EEXIST for race condition */
if (mkdir(path, mode) != 0 && errno != EEXIST)
status = -1;
} else if (!S_ISDIR(st.st_mode)) {
errno = ENOTDIR;
status = -1;
}
return (status);
}
// mkpath - ensure all directories in path exist
// Algorithm takes the pessimistic view and works top-down to ensure
// each directory in path exists, rather than optimistically creating
// the last element and working backwards.
int mkpath(const char *path, mode_t mode) {
char *pp;
char *sp;
int status;
char *copypath = strdup(path);
status = 0;
pp = copypath;
while (status == 0 && (sp = strchr(pp, '/')) != 0) {
if (sp != pp) {
/* Neither root nor double slash in path */
*sp = '\0';
status = do_mkdir(copypath, mode);
*sp = '/';
}
pp = sp + 1;
}
if (status == 0)
status = do_mkdir(path, mode);
free(copypath);
return (status);
}
#ifdef CONFIG_MBEDTLS
char *base64_enc(uint8_t *input, int length) {
char *buf = NULL;
size_t dlen = 0;
int rc = mbedtls_base64_encode(NULL, 0, &dlen, input, length);
if (rc && (rc != MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL))
debug(1, "Error %d getting length of base64 encode.", rc);
else {
buf = (char *)malloc(dlen);
rc = mbedtls_base64_encode((unsigned char *)buf, dlen, &dlen, input, length);
if (rc != 0)
debug(1, "Error %d encoding base64.", rc);
}
return buf;
}
uint8_t *base64_dec(char *input, int *outlen) {
// slight problem here is that Apple cut the padding off their challenges. We must restore it
// before passing it in to the decoder, it seems
uint8_t *buf = NULL;
size_t dlen = 0;
int inbufsize = ((strlen(input) + 3) / 4) * 4; // this is the size of the input buffer we will
// send to the decoder, but we need space for 3
// extra "="s and a NULL
char *inbuf = malloc(inbufsize + 4);
if (inbuf == 0)
debug(1, "Can't malloc memory for inbuf in base64_decode.");
else {
strcpy(inbuf, input);
strcat(inbuf, "===");
// debug(1,"base64_dec called with string \"%s\", length %d, filled string: \"%s\", length %d.",
// input,strlen(input),inbuf,inbufsize);
int rc = mbedtls_base64_decode(NULL, 0, &dlen, (unsigned char *)inbuf, inbufsize);
if (rc && (rc != MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL))
debug(1, "Error %d getting decode length, result is %d.", rc, dlen);
else {
// debug(1,"Decode size is %d.",dlen);
buf = malloc(dlen);
if (buf == 0)
debug(1, "Can't allocate memory in base64_dec.");
else {
rc = mbedtls_base64_decode(buf, dlen, &dlen, (unsigned char *)inbuf, inbufsize);
if (rc != 0)
debug(1, "Error %d in base64_dec.", rc);
}
}
free(inbuf);
}
*outlen = dlen;
return buf;
}
#endif
#ifdef CONFIG_POLARSSL
char *base64_enc(uint8_t *input, int length) {
char *buf = NULL;
size_t dlen = 0;
int rc = base64_encode(NULL, &dlen, input, length);
if (rc && (rc != POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL))
debug(1, "Error %d getting length of base64 encode.", rc);
else {
buf = (char *)malloc(dlen);
rc = base64_encode((unsigned char *)buf, &dlen, input, length);
if (rc != 0)
debug(1, "Error %d encoding base64.", rc);
}
return buf;
}
uint8_t *base64_dec(char *input, int *outlen) {
// slight problem here is that Apple cut the padding off their challenges. We must restore it
// before passing it in to the decoder, it seems
uint8_t *buf = NULL;
size_t dlen = 0;
int inbufsize = ((strlen(input) + 3) / 4) * 4; // this is the size of the input buffer we will
// send to the decoder, but we need space for 3
// extra "="s and a NULL
char *inbuf = malloc(inbufsize + 4);
if (inbuf == 0)
debug(1, "Can't malloc memory for inbuf in base64_decode.");
else {
strcpy(inbuf, input);
strcat(inbuf, "===");
// debug(1,"base64_dec called with string \"%s\", length %d, filled string: \"%s\", length
// %d.",input,strlen(input),inbuf,inbufsize);
int rc = base64_decode(buf, &dlen, (unsigned char *)inbuf, inbufsize);
if (rc && (rc != POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL))
debug(1, "Error %d getting decode length, result is %d.", rc, dlen);
else {
// debug(1,"Decode size is %d.",dlen);
buf = malloc(dlen);
if (buf == 0)
debug(1, "Can't allocate memory in base64_dec.");
else {
rc = base64_decode(buf, &dlen, (unsigned char *)inbuf, inbufsize);
if (rc != 0)
debug(1, "Error %d in base64_dec.", rc);
}
}
free(inbuf);
}
*outlen = dlen;
return buf;
}
#endif
#ifdef CONFIG_OPENSSL
char *base64_enc(uint8_t *input, int length) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
BIO *bmem, *b64;
BUF_MEM *bptr;
b64 = BIO_new(BIO_f_base64());
bmem = BIO_new(BIO_s_mem());
b64 = BIO_push(b64, bmem);
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
BIO_write(b64, input, length);
(void) BIO_flush(b64);
BIO_get_mem_ptr(b64, &bptr);
char *buf = (char *)malloc(bptr->length);
if (buf == NULL)
die("could not allocate memory for buf in base64_enc");
if (bptr->length) {
memcpy(buf, bptr->data, bptr->length - 1);
buf[bptr->length - 1] = 0;
}
BIO_free_all(b64);
pthread_setcancelstate(oldState, NULL);
return buf;
}
uint8_t *base64_dec(char *input, int *outlen) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
BIO *bmem, *b64;
int inlen = strlen(input);
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
bmem = BIO_new(BIO_s_mem());
b64 = BIO_push(b64, bmem);
// Apple cut the padding off their challenges; restore it
BIO_write(bmem, input, inlen);
while (inlen++ & 3)
BIO_write(bmem, "=", 1);
(void) BIO_flush(bmem);
int bufsize = strlen(input) * 3 / 4 + 1;
uint8_t *buf = malloc(bufsize);
int nread;
nread = BIO_read(b64, buf, bufsize);
BIO_free_all(b64);
*outlen = nread;
pthread_setcancelstate(oldState, NULL);
return buf;
}
#endif
static char super_secret_key[] =
"-----BEGIN RSA PRIVATE KEY-----\n"
"MIIEpQIBAAKCAQEA59dE8qLieItsH1WgjrcFRKj6eUWqi+bGLOX1HL3U3GhC/j0Qg90u3sG/1CUt\n"
"wC5vOYvfDmFI6oSFXi5ELabWJmT2dKHzBJKa3k9ok+8t9ucRqMd6DZHJ2YCCLlDRKSKv6kDqnw4U\n"
"wPdpOMXziC/AMj3Z/lUVX1G7WSHCAWKf1zNS1eLvqr+boEjXuBOitnZ/bDzPHrTOZz0Dew0uowxf\n"
"/+sG+NCK3eQJVxqcaJ/vEHKIVd2M+5qL71yJQ+87X6oV3eaYvt3zWZYD6z5vYTcrtij2VZ9Zmni/\n"
"UAaHqn9JdsBWLUEpVviYnhimNVvYFZeCXg/IdTQ+x4IRdiXNv5hEewIDAQABAoIBAQDl8Axy9XfW\n"
"BLmkzkEiqoSwF0PsmVrPzH9KsnwLGH+QZlvjWd8SWYGN7u1507HvhF5N3drJoVU3O14nDY4TFQAa\n"
"LlJ9VM35AApXaLyY1ERrN7u9ALKd2LUwYhM7Km539O4yUFYikE2nIPscEsA5ltpxOgUGCY7b7ez5\n"
"NtD6nL1ZKauw7aNXmVAvmJTcuPxWmoktF3gDJKK2wxZuNGcJE0uFQEG4Z3BrWP7yoNuSK3dii2jm\n"
"lpPHr0O/KnPQtzI3eguhe0TwUem/eYSdyzMyVx/YpwkzwtYL3sR5k0o9rKQLtvLzfAqdBxBurciz\n"
"aaA/L0HIgAmOit1GJA2saMxTVPNhAoGBAPfgv1oeZxgxmotiCcMXFEQEWflzhWYTsXrhUIuz5jFu\n"
"a39GLS99ZEErhLdrwj8rDDViRVJ5skOp9zFvlYAHs0xh92ji1E7V/ysnKBfsMrPkk5KSKPrnjndM\n"
"oPdevWnVkgJ5jxFuNgxkOLMuG9i53B4yMvDTCRiIPMQ++N2iLDaRAoGBAO9v//mU8eVkQaoANf0Z\n"
"oMjW8CN4xwWA2cSEIHkd9AfFkftuv8oyLDCG3ZAf0vrhrrtkrfa7ef+AUb69DNggq4mHQAYBp7L+\n"
"k5DKzJrKuO0r+R0YbY9pZD1+/g9dVt91d6LQNepUE/yY2PP5CNoFmjedpLHMOPFdVgqDzDFxU8hL\n"
"AoGBANDrr7xAJbqBjHVwIzQ4To9pb4BNeqDndk5Qe7fT3+/H1njGaC0/rXE0Qb7q5ySgnsCb3DvA\n"
"cJyRM9SJ7OKlGt0FMSdJD5KG0XPIpAVNwgpXXH5MDJg09KHeh0kXo+QA6viFBi21y340NonnEfdf\n"
"54PX4ZGS/Xac1UK+pLkBB+zRAoGAf0AY3H3qKS2lMEI4bzEFoHeK3G895pDaK3TFBVmD7fV0Zhov\n"
"17fegFPMwOII8MisYm9ZfT2Z0s5Ro3s5rkt+nvLAdfC/PYPKzTLalpGSwomSNYJcB9HNMlmhkGzc\n"
"1JnLYT4iyUyx6pcZBmCd8bD0iwY/FzcgNDaUmbX9+XDvRA0CgYEAkE7pIPlE71qvfJQgoA9em0gI\n"
"LAuE4Pu13aKiJnfft7hIjbK+5kyb3TysZvoyDnb3HOKvInK7vXbKuU4ISgxB2bB3HcYzQMGsz1qJ\n"
"2gG0N5hvJpzwwhbhXqFKA4zaaSrw622wDniAK5MlIE0tIAKKP4yxNGjoD2QYjhBGuhvkWKY=\n"
"-----END RSA PRIVATE KEY-----\0";
#ifdef CONFIG_OPENSSL
uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
RSA *rsa = NULL;
if (!rsa) {
BIO *bmem = BIO_new_mem_buf(super_secret_key, -1);
rsa = PEM_read_bio_RSAPrivateKey(bmem, NULL, NULL, NULL);
BIO_free(bmem);
}
uint8_t *out = malloc(RSA_size(rsa));
switch (mode) {
case RSA_MODE_AUTH:
*outlen = RSA_private_encrypt(inlen, input, out, rsa, RSA_PKCS1_PADDING);
break;
case RSA_MODE_KEY:
*outlen = RSA_private_decrypt(inlen, input, out, rsa, RSA_PKCS1_OAEP_PADDING);
break;
default:
die("bad rsa mode");
}
RSA_free(rsa);
pthread_setcancelstate(oldState, NULL);
return out;
}
#endif
#ifdef CONFIG_MBEDTLS
uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode) {
mbedtls_pk_context pkctx;
mbedtls_rsa_context *trsa;
const char *pers = "rsa_encrypt";
size_t olen = *outlen;
int rc;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_init(&entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers,
strlen(pers));
mbedtls_pk_init(&pkctx);
rc = mbedtls_pk_parse_key(&pkctx, (unsigned char *)super_secret_key, sizeof(super_secret_key),
NULL, 0);
if (rc != 0)
debug(1, "Error %d reading the private key.", rc);
uint8_t *outbuf = NULL;
trsa = mbedtls_pk_rsa(pkctx);
switch (mode) {
case RSA_MODE_AUTH:
mbedtls_rsa_set_padding(trsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE);
outbuf = malloc(trsa->len);
rc = mbedtls_rsa_pkcs1_encrypt(trsa, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PRIVATE,
inlen, input, outbuf);
if (rc != 0)
debug(1, "mbedtls_pk_encrypt error %d.", rc);
*outlen = trsa->len;
break;
case RSA_MODE_KEY:
mbedtls_rsa_set_padding(trsa, MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA1);
outbuf = malloc(trsa->len);
rc = mbedtls_rsa_pkcs1_decrypt(trsa, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PRIVATE,
&olen, input, outbuf, trsa->len);
if (rc != 0)
debug(1, "mbedtls_pk_decrypt error %d.", rc);
*outlen = olen;
break;
default:
die("bad rsa mode");
}
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
mbedtls_pk_free(&pkctx);
return outbuf;
}
#endif
#ifdef CONFIG_POLARSSL
uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode) {
rsa_context trsa;
const char *pers = "rsa_encrypt";
int rc;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
entropy_init(&entropy);
if ((rc = ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, (const unsigned char *)pers,
strlen(pers))) != 0)
debug(1, "ctr_drbg_init returned %d\n", rc);
rsa_init(&trsa, RSA_PKCS_V21, POLARSSL_MD_SHA1); // padding and hash id get overwritten
// BTW, this seems to reset a lot of parameters in the rsa_context
rc = x509parse_key(&trsa, (unsigned char *)super_secret_key, strlen(super_secret_key), NULL, 0);
if (rc != 0)
debug(1, "Error %d reading the private key.");
uint8_t *out = NULL;
switch (mode) {
case RSA_MODE_AUTH:
trsa.padding = RSA_PKCS_V15;
trsa.hash_id = POLARSSL_MD_NONE;
debug(2, "rsa_apply encrypt");
out = malloc(trsa.len);
rc = rsa_pkcs1_encrypt(&trsa, ctr_drbg_random, &ctr_drbg, RSA_PRIVATE, inlen, input, out);
if (rc != 0)
debug(1, "rsa_pkcs1_encrypt error %d.", rc);
*outlen = trsa.len;
break;
case RSA_MODE_KEY:
debug(2, "rsa_apply decrypt");
trsa.padding = RSA_PKCS_V21;
trsa.hash_id = POLARSSL_MD_SHA1;
out = malloc(trsa.len);
#if POLARSSL_VERSION_NUMBER >= 0x01020900
rc = rsa_pkcs1_decrypt(&trsa, ctr_drbg_random, &ctr_drbg, RSA_PRIVATE, (size_t *)outlen, input,
out, trsa.len);
#else
rc = rsa_pkcs1_decrypt(&trsa, RSA_PRIVATE, outlen, input, out, trsa.len);
#endif
if (rc != 0)
debug(1, "decrypt error %d.", rc);
break;
default:
die("bad rsa mode");
}
rsa_free(&trsa);
debug(2, "rsa_apply exit");
return out;
}
#endif
int config_set_lookup_bool(config_t *cfg, char *where, int *dst) {
const char *str = 0;
if (config_lookup_string(cfg, where, &str)) {
if (strcasecmp(str, "no") == 0) {
(*dst) = 0;
return 1;
} else if (strcasecmp(str, "yes") == 0) {
(*dst) = 1;
return 1;
} else {
die("Invalid %s option choice \"%s\". It should be \"yes\" or \"no\"", where, str);
return 0;
}
} else {
return 0;
}
}
void command_set_volume(double volume) {
// this has a cancellation point if waiting is enabled
if (config.cmd_set_volume) {
/*Spawn a child to run the program.*/
pid_t pid = fork();
if (pid == 0) { /* child process */
size_t command_buffer_size = strlen(config.cmd_set_volume) + 32;
char *command_buffer = (char *)malloc(command_buffer_size);
if (command_buffer == NULL) {
inform("Couldn't allocate memory for set_volume argument string");
} else {
memset(command_buffer, 0, command_buffer_size);
snprintf(command_buffer, command_buffer_size, "%s %f", config.cmd_set_volume, volume);
// debug(1,"command_buffer is \"%s\".",command_buffer);
int argC;
char **argV;
// debug(1,"set_volume command found.");
if (poptParseArgvString(command_buffer, &argC, (const char ***)&argV) != 0) {
// note that argV should be free()'d after use, but we expect this fork to exit
// eventually.
warn("Can't decipher on-set-volume command arguments \"%s\".", command_buffer);
free(argV);
free(command_buffer);
} else {
free(command_buffer);
// debug(1,"Executing on-set-volume command %s with %d arguments.",argV[0],argC);
execv(argV[0], argV);
warn("Execution of on-set-volume command \"%s\" failed to start", config.cmd_set_volume);
// debug(1, "Error executing on-set-volume command %s", config.cmd_set_volume);
exit(127); /* only if execv fails */
}
}
} else {
if (config.cmd_blocking) { /* pid!=0 means parent process and if blocking is true, wait for
process to finish */
pid_t rc = waitpid(pid, 0, 0); /* wait for child to exit */
if (rc != pid) {
warn("Execution of on-set-volume command returned an error.");
debug(1, "on-set-volume command %s finished with error %d", config.cmd_set_volume, errno);
}
}
// debug(1,"Continue after on-set-volume command");
}
}
}
void command_start(void) {
// this has a cancellation point if waiting is enabled or a response is awaited
if (config.cmd_start) {
pid_t pid;
int pipes[2];
if (config.cmd_start_returns_output && pipe(pipes) != 0) {
warn("Unable to allocate pipe for popen of start command.");
debug(1, "pipe finished with error %d", errno);
return;
}
/*Spawn a child to run the program.*/
pid = fork();
if (pid == 0) { /* child process */
int argC;
char **argV;
if (config.cmd_start_returns_output) {
close(pipes[0]);
if (dup2(pipes[1], 1) < 0) {
warn("Unable to reopen pipe as stdout for popen of start command");
debug(1, "dup2 finished with error %d", errno);
close(pipes[1]);
return;
}
}
// debug(1,"on-start command found.");
if (poptParseArgvString(config.cmd_start, &argC, (const char ***)&argV) !=
0) // note that argV should be free()'d after use, but we expect this fork to exit
// eventually.
debug(1, "Can't decipher on-start command arguments");
else {
// debug(1,"Executing on-start command %s with %d arguments.",argV[0],argC);
execv(argV[0], argV);
warn("Execution of on-start command failed to start");
debug(1, "Error executing on-start command %s", config.cmd_start);
exit(127); /* only if execv fails */
}
} else {
if (config.cmd_blocking || config.cmd_start_returns_output) { /* pid!=0 means parent process
and if blocking is true, wait for
process to finish */
pid_t rc = waitpid(pid, 0, 0); /* wait for child to exit */
if ((rc != pid) && (errno != ECHILD)) {
// In this context, ECHILD means that the child process has already completed, I think!
warn("Execution of on-start command returned an error.");
debug(1, "on-start command %s finished with error %d", config.cmd_start, errno);
}
if (config.cmd_start_returns_output) {
static char buffer[256];
int len;
close(pipes[1]);
len = read(pipes[0], buffer, 255);
close(pipes[0]);
buffer[len] = '\0';
if (buffer[len - 1] == '\n')
buffer[len - 1] = '\0'; // strip trailing newlines
debug(1, "received '%s' as the device to use from the on-start command", buffer);
#ifdef CONFIG_ALSA
set_alsa_out_dev(buffer);
#endif
}
}
// debug(1,"Continue after on-start command");
}
}
}
void command_execute(const char *command, const char *extra_argument, const int block) {
// this has a cancellation point if waiting is enabled
if (command) {
char new_command_buffer[1024];
char *full_command = (char *)command;
if (extra_argument != NULL) {
memset(new_command_buffer, 0, sizeof(new_command_buffer));
snprintf(new_command_buffer, sizeof(new_command_buffer), "%s %s", command, extra_argument);
full_command = new_command_buffer;
}
/*Spawn a child to run the program.*/
pid_t pid = fork();
if (pid == 0) { /* child process */
int argC;
char **argV;
if (poptParseArgvString(full_command, &argC, (const char ***)&argV) !=
0) // note that argV should be free()'d after use, but we expect this fork to exit
// eventually.
debug(1, "Can't decipher command arguments in \"%s\".", full_command);
else {
// debug(1,"Executing command %s",full_command);
execv(argV[0], argV);
warn("Execution of command \"%s\" failed to start", full_command);
debug(1, "Error executing command \"%s\".", full_command);
exit(127); /* only if execv fails */
}
} else {
if (block) { /* pid!=0 means parent process and if blocking is true, wait for
process to finish */
pid_t rc = waitpid(pid, 0, 0); /* wait for child to exit */
if ((rc != pid) && (errno != ECHILD)) {
// In this context, ECHILD means that the child process has already completed, I think!
warn("Execution of command \"%s\" returned an error.", full_command);
debug(1, "Command \"%s\" finished with error %d", full_command, errno);
}
}
// debug(1,"Continue after on-unfixable command");
}
}
}
void command_stop(void) {
// this has a cancellation point if waiting is enabled
if (config.cmd_stop)
command_execute(config.cmd_stop, "", config.cmd_blocking);
}
// this is for reading an unsigned 32 bit number, such as an RTP timestamp
uint32_t uatoi(const char *nptr) {
uint64_t llint = atoll(nptr);
uint32_t r = llint;
return r;
}
double flat_vol2attn(double vol, long max_db, long min_db) {
double vol_setting = min_db; // if all else fails, set this, for safety
if ((vol <= 0.0) && (vol >= -30.0)) {
vol_setting = ((max_db - min_db) * (30.0 + vol) / 30) + min_db;
// debug(2, "Linear profile Volume Setting: %f in range %ld to %ld.", vol_setting, min_db,
// max_db);
} else if (vol != -144.0) {
debug(1,
"Linear volume request value %f is out of range: should be from 0.0 to -30.0 or -144.0.",
vol);
}
return vol_setting;
}
// Given a volume (0 to -30) and high and low attenuations available in the mixer in dB, return an
// attenuation depending on the volume and the function's transfer function
// See http://tangentsoft.net/audio/atten.html for data on good attenuators.
// We want a smooth attenuation function, like, for example, the ALPS RK27 Potentiometer transfer
// functions referred to at the link above.
// Note that the max_db and min_db are given as dB*100
double vol2attn(double vol, long max_db, long min_db) {
// We use a little coordinate geometry to build a transfer function from the volume passed in to
// the device's dynamic range. (See the diagram in the documents folder.) The x axis is the
// "volume in" which will be from -30 to 0. The y axis will be the "volume out" which will be from
// the bottom of the range to the top. We build the transfer function from one or more lines. We
// characterise each line with two numbers: the first is where on x the line starts when y=0 (x
// can be from 0 to -30); the second is where on y the line stops when when x is -30. thus, if the
// line was characterised as {0,-30}, it would be an identity transfer. Assuming, for example, a
// dynamic range of lv=-60 to hv=0 Typically we'll use three lines -- a three order transfer
// function First: {0,30} giving a gentle slope -- the 30 comes from half the dynamic range
// Second: {-5,-30-(lv+30)/2} giving a faster slope from y=0 at x=-12 to y=-42.5 at x=-30
// Third: {-17,lv} giving a fast slope from y=0 at x=-19 to y=-60 at x=-30
#define order 3
double vol_setting = 0;
if ((vol <= 0.0) && (vol >= -30.0)) {
long range_db = max_db - min_db; // this will be a positive number
// debug(1,"Volume min %ddB, max %ddB, range %ddB.",min_db,max_db,range_db);
// double first_slope = -3000.0; // this is the slope of the attenuation at the high end -- 30dB
// for the full rotation.
double first_slope =
-range_db /
2; // this is the slope of the attenuation at the high end -- 30dB for the full rotation.
if (-range_db > first_slope)
first_slope = range_db;
double lines[order][2] = {
{0, first_slope}, {-5, first_slope - (range_db + first_slope) / 2}, {-17, -range_db}};
int i;
for (i = 0; i < order; i++) {
if (vol <= lines[i][0]) {
double tvol = lines[i][1] * (vol - lines[i][0]) / (-30 - lines[i][0]);
// debug(1,"On line %d, end point of %f, input vol %f yields output vol
// %f.",i,lines[i][1],vol,tvol);
if (tvol < vol_setting)
vol_setting = tvol;
}
}
vol_setting += max_db;
} else if (vol != -144.0) {
debug(1, "Volume request value %f is out of range: should be from 0.0 to -30.0 or -144.0.",
vol);
vol_setting = min_db; // for safety, return the lowest setting...
} else {
vol_setting = min_db; // for safety, return the lowest setting...
}
// debug(1,"returning an attenuation of %f.",vol_setting);
// debug(2, "Standard profile Volume Setting for Airplay vol %f: %f in range %ld to %ld.", vol,
// vol_setting, min_db, max_db);
return vol_setting;
}
uint64_t get_absolute_time_in_fp() {
uint64_t time_now_fp;
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
struct timespec tn;
// can't use CLOCK_MONOTONIC_RAW as it's not implemented in OpenWrt
clock_gettime(CLOCK_MONOTONIC, &tn);
uint64_t tnfpsec = tn.tv_sec;
if (tnfpsec > 0x100000000)
warn("clock_gettime seconds overflow!");
uint64_t tnfpnsec = tn.tv_nsec;
if (tnfpnsec > 0x100000000)
warn("clock_gettime nanoseconds seconds overflow!");
tnfpsec = tnfpsec << 32;
tnfpnsec = tnfpnsec << 32;
tnfpnsec = tnfpnsec / 1000000000;
time_now_fp = tnfpsec + tnfpnsec; // types okay
#endif
#ifdef COMPILE_FOR_OSX
uint64_t time_now_mach;
uint64_t elapsedNano;
static mach_timebase_info_data_t sTimebaseInfo = {0, 0};
time_now_mach = mach_absolute_time();
// If this is the first time we've run, get the timebase.
// We can use denom == 0 to indicate that sTimebaseInfo is
// uninitialised because it makes no sense to have a zero
// denominator in a fraction.
if (sTimebaseInfo.denom == 0) {
debug(1, "Mac initialise timebase info.");
(void)mach_timebase_info(&sTimebaseInfo);
}
// Do the maths. We hope that the multiplication doesn't
// overflow; the price you pay for working in fixed point.
// this gives us nanoseconds
uint64_t time_now_ns = time_now_mach * sTimebaseInfo.numer / sTimebaseInfo.denom;
// take the units and shift them to the upper half of the fp, and take the nanoseconds, shift them
// to the upper half and then divide the result to 1000000000
time_now_fp =
((time_now_ns / 1000000000) << 32) + (((time_now_ns % 1000000000) << 32) / 1000000000);
#endif
return time_now_fp;
}
ssize_t non_blocking_write_with_timeout(int fd, const void *buf, size_t count, int timeout) {
// timeout is in milliseconds
void *ibuf = (void *)buf;
size_t bytes_remaining = count;
int rc = 1;
struct pollfd ufds[1];
while ((bytes_remaining > 0) && (rc > 0)) {
// check that we can do some writing
ufds[0].fd = fd;
ufds[0].events = POLLOUT;
rc = poll(ufds, 1, timeout);
if (rc < 0) {
// debug(1, "non-blocking write error waiting for pipe to become ready for writing...");
} else if (rc == 0) {
// warn("non-blocking write timeout waiting for pipe to become ready for writing");
rc = -1;
errno = -ETIMEDOUT;
} else { // rc > 0, implying it might be ready
ssize_t bytes_written = write(fd, ibuf, bytes_remaining);
if (bytes_written == -1) {
// debug(1,"Error %d in non_blocking_write: \"%s\".",errno,strerror(errno));
rc = bytes_written; // to imitate the return from write()
} else {
ibuf += bytes_written;
bytes_remaining -= bytes_written;
}
}
}
if (rc > 0)
return count - bytes_remaining; // this is just to mimic a normal write/3.
else
return rc;
// return write(fd,buf,count);
}
ssize_t non_blocking_write(int fd, const void *buf, size_t count) {
return non_blocking_write_with_timeout(fd,buf,count,5000); // default is 5 seconds.
}
/* from
* http://coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring#comment-722
*/