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shairport-sync/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 -- 2021
* 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"
#ifdef CONFIG_USE_GIT_VERSION_STRING
#include "gitversion.h"
#endif
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h> // PRIdPTR
#include <libgen.h>
#include <math.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>
#include <ifaddrs.h>
#ifdef COMPILE_FOR_LINUX
#include <netpacket/packet.h>
#endif
#ifdef COMPILE_FOR_BSD
#include <net/if_dl.h>
#include <net/if_types.h>
#include <netinet/in.h>
#endif
#ifdef COMPILE_FOR_OSX
#include <CoreServices/CoreServices.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <netinet/in.h>
#endif
#ifdef CONFIG_OPENSSL
#include <openssl/aes.h> // needed for older AES stuff
#include <openssl/bio.h> // needed for BIO_new_mem_buf
#include <openssl/err.h> // needed for ERR_error_string, ERR_get_error
#include <openssl/evp.h> // needed for EVP_PKEY_CTX_new, EVP_PKEY_sign_init, EVP_PKEY_sign
#include <openssl/pem.h> // needed for PEM_read_bio_RSAPrivateKey, EVP_PKEY_CTX_set_rsa_padding
#include <openssl/rsa.h> // needed for EVP_PKEY_CTX_set_rsa_padding
#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
#ifdef CONFIG_AIRPLAY_2
#include "nqptp-shm-structures.h"
#endif
config_t config_file_stuff;
int type_of_exit_cleanup;
uint64_t ns_time_at_startup, ns_time_at_last_debug_message;
// always lock use this when accessing the ns_time_at_last_debug_message
static pthread_mutex_t debug_timing_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t the_conn_lock = PTHREAD_MUTEX_INITIALIZER;
const char *sps_format_description_string_array[] = {
"unknown", "S8", "U8", "S16", "S16_LE", "S16_BE", "S24", "S24_LE",
"S24_BE", "S24_3LE", "S24_3BE", "S32", "S32_LE", "S32_BE", "auto", "invalid"};
const char *sps_format_description_string(sps_format_t format) {
if (format <= SPS_FORMAT_AUTO)
return sps_format_description_string_array[format];
else
return sps_format_description_string_array[SPS_FORMAT_INVALID];
}
// 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_to_stderr(__attribute__((unused)) int prio, const char *t, ...) {
char s[16384];
va_list args;
va_start(args, t);
vsnprintf(s, sizeof(s), t, args);
va_end(args);
fprintf(stderr, "%s\n", s);
}
void do_sps_log_to_stdout(__attribute__((unused)) int prio, const char *t, ...) {
char s[16384];
va_list args;
va_start(args, t);
vsnprintf(s, sizeof(s), t, args);
va_end(args);
fprintf(stdout, "%s\n", s);
}
int create_log_file(const char *path) {
int fd = -1;
if (path != NULL) {
char *dirc = strdup(path);
if (dirc) {
char *dname = dirname(dirc);
// create the directory, if necessary
int result = 0;
if (dname) {
char *pdir = realpath(dname, NULL); // will return a NULL if the directory doesn't exist
if (pdir == NULL) {
mode_t oldumask = umask(000);
result = mkpath(dname, 0777);
umask(oldumask);
} else {
free(pdir);
}
if ((result == 0) || (result == -EEXIST)) {
// now open the file
fd = open(path, O_WRONLY | O_NONBLOCK | O_CREAT | O_EXCL,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if ((fd == -1) && (errno == EEXIST))
fd = open(path, O_WRONLY | O_APPEND | O_NONBLOCK);
if (fd >= 0) {
// now we switch to blocking mode
int flags = fcntl(fd, F_GETFL);
if (flags == -1) {
// strerror_r(errno, (char
//*)errorstring, sizeof(errorstring));
// debug(1, "create_log_file -- error %d (\"%s\") getting flags of pipe: \"%s\".",
// errno,
// (char *)errorstring, pathname);
} else {
flags = fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
// if (flags == -1) {
// strerror_r(errno,
//(char *)errorstring, sizeof(errorstring));
// debug(1, "create_log_file -- error %d
//(\"%s\") unsetting NONBLOCK of pipe: \"%s\".", errno,
//(char *)errorstring, pathname);
}
}
}
}
free(dirc);
}
}
return fd;
}
void do_sps_log_to_fd(__attribute__((unused)) int prio, const char *t, ...) {
char s[16384];
va_list args;
va_start(args, t);
vsnprintf(s, sizeof(s), t, args);
va_end(args);
if (config.log_fd == -1)
config.log_fd = create_log_file(config.log_file_path);
if (config.log_fd >= 0) {
dprintf(config.log_fd, "%s\n", s);
} else if (errno != ENXIO) { // maybe there is a pipe there but not hooked up
fprintf(stderr, "%s\n", s);
}
}
void log_to_stderr() { sps_log = do_sps_log_to_stderr; }
void log_to_stdout() { sps_log = do_sps_log_to_stdout; }
void log_to_file() { sps_log = do_sps_log_to_fd; }
void log_to_syslog() {
#ifdef CONFIG_LIBDAEMON
sps_log = daemon_log;
#else
sps_log = syslog;
#endif
}
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;
}
// if port is zero, pick any port
// otherwise, try the given port only
int bind_socket_and_port(int type, int ip_family, const char *self_ip_address, uint32_t scope_id,
uint16_t *port, int *sock) {
int ret = 0; // no error
int local_socket = socket(ip_family, type, 0);
if (local_socket == -1)
ret = errno;
if (ret == 0) {
SOCKADDR myaddr;
memset(&myaddr, 0, sizeof(myaddr));
if (ip_family == AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *)&myaddr;
sa->sin_family = AF_INET;
sa->sin_port = ntohs(*port);
inet_pton(AF_INET, self_ip_address, &(sa->sin_addr));
ret = bind(local_socket, (struct sockaddr *)sa, sizeof(struct sockaddr_in));
}
#ifdef AF_INET6
if (ip_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&myaddr;
sa6->sin6_family = AF_INET6;
sa6->sin6_port = ntohs(*port);
inet_pton(AF_INET6, self_ip_address, &(sa6->sin6_addr));
sa6->sin6_scope_id = scope_id;
ret = bind(local_socket, (struct sockaddr *)sa6, sizeof(struct sockaddr_in6));
}
#endif
if (ret < 0) {
ret = errno;
close(local_socket);
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
warn("error %d: \"%s\". Could not bind a port!", errno, errorstring);
} else {
uint16_t sport;
SOCKADDR local;
socklen_t local_len = sizeof(local);
ret = getsockname(local_socket, (struct sockaddr *)&local, &local_len);
if (ret < 0) {
ret = errno;
close(local_socket);
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
warn("error %d: \"%s\". Could not retrieve socket's port!", errno, errorstring);
} else {
#ifdef AF_INET6
if (local.SAFAMILY == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&local;
sport = ntohs(sa6->sin6_port);
} else
#endif
{
struct sockaddr_in *sa = (struct sockaddr_in *)&local;
sport = ntohs(sa->sin_port);
}
*sock = local_socket;
*port = sport;
}
}
}
return ret;
}
uint16_t bind_UDP_port(int ip_family, const char *self_ip_address, uint32_t scope_id, int *sock) {
// look for a port in the range, if any was specified.
int ret = 0;
int local_socket = socket(ip_family, SOCK_DGRAM, IPPROTO_UDP);
if (local_socket == -1)
die("Could not allocate a socket.");
/*
int val = 1;
ret = setsockopt(local_socket, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
if (ret < 0) {
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
debug(1, "Error %d: \"%s\". Couldn't set SO_REUSEADDR");
}
*/
SOCKADDR myaddr;
int tryCount = 0;
uint16_t desired_port;
do {
tryCount++;
desired_port = nextFreeUDPPort();
memset(&myaddr, 0, sizeof(myaddr));
if (ip_family == AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *)&myaddr;
sa->sin_family = AF_INET;
sa->sin_port = ntohs(desired_port);
inet_pton(AF_INET, self_ip_address, &(sa->sin_addr));
ret = bind(local_socket, (struct sockaddr *)sa, sizeof(struct sockaddr_in));
}
#ifdef AF_INET6
if (ip_family == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&myaddr;
sa6->sin6_family = AF_INET6;
sa6->sin6_port = ntohs(desired_port);
inet_pton(AF_INET6, self_ip_address, &(sa6->sin6_addr));
sa6->sin6_scope_id = scope_id;
ret = bind(local_socket, (struct sockaddr *)sa6, sizeof(struct sockaddr_in6));
}
#endif
} while ((ret < 0) && (errno == EADDRINUSE) && (desired_port != 0) &&
(tryCount < config.udp_port_range));
// debug(1,"UDP port chosen: %d.",desired_port);
if (ret < 0) {
close(local_socket);
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
die("error %d: \"%s\". Could not bind a UDP port! Check the udp_port_range is large enough -- "
"it must be "
"at least 3, and 10 or more is suggested -- or "
"check for restrictive firewall settings or a bad router! UDP base is %u, range is %u and "
"current suggestion is %u.",
errno, errorstring, config.udp_port_base, config.udp_port_range, desired_port);
}
uint16_t sport;
SOCKADDR local;
socklen_t local_len = sizeof(local);
getsockname(local_socket, (struct sockaddr *)&local, &local_len);
#ifdef AF_INET6
if (local.SAFAMILY == AF_INET6) {
struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&local;
sport = ntohs(sa6->sin6_port);
} else
#endif
{
struct sockaddr_in *sa = (struct sockaddr_in *)&local;
sport = ntohs(sa->sin_port);
}
*sock = local_socket;
return sport;
}
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; }
char *generate_preliminary_string(char *buffer, size_t buffer_length, double tss, double tsl,
const char *filename, const int linenumber, const char *prefix) {
char *insertion_point = buffer;
if (config.debugger_show_elapsed_time) {
snprintf(insertion_point, buffer_length, "% 20.9f", tss);
insertion_point = insertion_point + strlen(insertion_point);
}
if (config.debugger_show_relative_time) {
snprintf(insertion_point, buffer_length, "% 20.9f", tsl);
insertion_point = insertion_point + strlen(insertion_point);
}
if (config.debugger_show_file_and_line) {
snprintf(insertion_point, buffer_length, " \"%s:%d\"", filename, linenumber);
insertion_point = insertion_point + strlen(insertion_point);
}
if (prefix) {
snprintf(insertion_point, buffer_length, "%s", prefix);
insertion_point = insertion_point + strlen(insertion_point);
}
return insertion_point;
}
void _die(const char *thefilename, const int linenumber, const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char b[16384];
b[0] = 0;
char *s;
if (debuglev) {
pthread_mutex_lock(&debug_timing_lock);
uint64_t time_now = get_absolute_time_in_ns();
uint64_t time_since_start = time_now - ns_time_at_startup;
uint64_t time_since_last_debug_message = time_now - ns_time_at_last_debug_message;
ns_time_at_last_debug_message = time_now;
pthread_mutex_unlock(&debug_timing_lock);
char *basec = strdup(thefilename);
char *filename = basename(basec);
s = generate_preliminary_string(b, sizeof(b), 1.0 * time_since_start / 1000000000,
1.0 * time_since_last_debug_message / 1000000000, filename,
linenumber, " *fatal error: ");
free(basec);
} else {
strncpy(b, "fatal error: ", sizeof(b));
s = b + strlen(b);
}
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(b) - (s - b), format, args);
va_end(args);
sps_log(LOG_ERR, "%s", b);
pthread_setcancelstate(oldState, NULL);
type_of_exit_cleanup = TOE_emergency;
exit(EXIT_FAILURE);
}
void _warn(const char *thefilename, const int linenumber, const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char b[16384];
b[0] = 0;
char *s;
if (debuglev) {
pthread_mutex_lock(&debug_timing_lock);
uint64_t time_now = get_absolute_time_in_ns();
uint64_t time_since_start = time_now - ns_time_at_startup;
uint64_t time_since_last_debug_message = time_now - ns_time_at_last_debug_message;
ns_time_at_last_debug_message = time_now;
pthread_mutex_unlock(&debug_timing_lock);
char *basec = strdup(thefilename);
char *filename = basename(basec);
s = generate_preliminary_string(b, sizeof(b), 1.0 * time_since_start / 1000000000,
1.0 * time_since_last_debug_message / 1000000000, filename,
linenumber, " *warning: ");
free(basec);
} else {
strncpy(b, "warning: ", sizeof(b));
s = b + strlen(b);
}
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(b) - (s - b), format, args);
va_end(args);
sps_log(LOG_WARNING, "%s", b);
pthread_setcancelstate(oldState, NULL);
}
void _debug(const char *thefilename, const int linenumber, int level, const char *format, ...) {
if (level > debuglev)
return;
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char b[16384];
b[0] = 0;
pthread_mutex_lock(&debug_timing_lock);
uint64_t time_now = get_absolute_time_in_ns();
uint64_t time_since_start = time_now - ns_time_at_startup;
uint64_t time_since_last_debug_message = time_now - ns_time_at_last_debug_message;
ns_time_at_last_debug_message = time_now;
pthread_mutex_unlock(&debug_timing_lock);
char *basec = strdup(thefilename);
char *filename = basename(basec);
char *s = generate_preliminary_string(b, sizeof(b), 1.0 * time_since_start / 1000000000,
1.0 * time_since_last_debug_message / 1000000000, filename,
linenumber, " ");
free(basec);
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(b) - (s - b), format, args);
va_end(args);
sps_log(LOG_INFO, b); // LOG_DEBUG is hard to read on macOS terminal
pthread_setcancelstate(oldState, NULL);
}
void _inform(const char *thefilename, const int linenumber, const char *format, ...) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char b[16384];
b[0] = 0;
char *s;
if (debuglev) {
pthread_mutex_lock(&debug_timing_lock);
uint64_t time_now = get_absolute_time_in_ns();
uint64_t time_since_start = time_now - ns_time_at_startup;
uint64_t time_since_last_debug_message = time_now - ns_time_at_last_debug_message;
ns_time_at_last_debug_message = time_now;
pthread_mutex_unlock(&debug_timing_lock);
char *basec = strdup(thefilename);
char *filename = basename(basec);
s = generate_preliminary_string(b, sizeof(b), 1.0 * time_since_start / 1000000000,
1.0 * time_since_last_debug_message / 1000000000, filename,
linenumber, " ");
free(basec);
} else {
s = b;
}
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(b) - (s - b), format, args);
va_end(args);
sps_log(LOG_INFO, "%s", b);
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);
uint8_t *out = NULL;
BIO *bmem = BIO_new_mem_buf(super_secret_key, -1); // 1.0.2
EVP_PKEY *rsaKey = PEM_read_bio_PrivateKey(bmem, NULL, NULL, NULL); // 1.0.2
BIO_free(bmem);
size_t ol = 0;
if (rsaKey != NULL) {
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(rsaKey, NULL); // 1.0.2
if (ctx != NULL) {
switch (mode) {
case RSA_MODE_AUTH: {
if (EVP_PKEY_sign_init(ctx) > 0) { // 1.0.2
if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) > 0) { // 1.0.2
if (EVP_PKEY_sign(ctx, NULL, &ol, (const unsigned char *)input, inlen) > 0) { // 1.0.2
out = (unsigned char *)malloc(ol);
if (EVP_PKEY_sign(ctx, out, &ol, (const unsigned char *)input, inlen) > 0) { // 1.0.2
debug(3, "success with output length of %lu.", ol);
} else {
debug(1, "error 2 \"%s\" with EVP_PKEY_sign:",
ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1,
"error 1 \"%s\" with EVP_PKEY_sign:", ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1, "error \"%s\" with EVP_PKEY_CTX_set_rsa_padding:",
ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1,
"error \"%s\" with EVP_PKEY_sign_init:", ERR_error_string(ERR_get_error(), NULL));
}
} break;
case RSA_MODE_KEY: {
if (EVP_PKEY_decrypt_init(ctx) > 0) {
if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) > 0) {
/* Determine buffer length */
if (EVP_PKEY_decrypt(ctx, NULL, &ol, (const unsigned char *)input, inlen) > 0) {
out = OPENSSL_malloc(ol);
if (out != NULL) {
if (EVP_PKEY_decrypt(ctx, out, &ol, (const unsigned char *)input, inlen) > 0) {
debug(3, "decrypt success");
} else {
debug(1, "error \"%s\" with EVP_PKEY_decrypt:",
ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1, "OPENSSL_malloc failed");
}
} else {
debug(1,
"error \"%s\" with EVP_PKEY_decrypt:", ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1, "error \"%s\" with EVP_PKEY_CTX_set_rsa_padding:",
ERR_error_string(ERR_get_error(), NULL));
}
} else {
debug(1, "error \"%s\" with EVP_PKEY_decrypt_init:",
ERR_error_string(ERR_get_error(), NULL));
}
} break;
default:
debug(1, "Unknown mode");
break;
}
EVP_PKEY_CTX_free(ctx); // 1.0.2
} else {
printf("error \"%s\" with EVP_PKEY_CTX_new:\n", ERR_error_string(ERR_get_error(), NULL));
}
EVP_PKEY_free(rsaKey); // 1.0.2
} else {
printf("error \"%s\" with EVP_PKEY_new:\n", ERR_error_string(ERR_get_error(), NULL));
}
*outlen = ol;
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(EXIT_FAILURE); /* only if execv fails */
}
}
_exit(EXIT_SUCCESS);
} 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(EXIT_FAILURE); /* 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[2048];
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(EXIT_FAILURE); /* 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;
}
// clang-format off
// Given an AirPlay volume (0 to -30) and the highest and lowest attenuations available in the mixer,
// the *vol2attn functions return anmattenuation depending on the AirPlay volume
// and the function's transfer function.
// Note that the max_db and min_db are given as dB*100
// clang-format on
double flat_vol2attn(double vol, long max_db, long min_db) {
// clang-format off
// This "flat" volume control profile has the property that a given change in the AirPlay volume
// always results in the same change in output dB. For example, if a change of AirPlay volume
// from 0 to -4 resulted in a 7 dB change, then a change in AirPlay volume from -20 to -24
// would also result in a 7 dB change.
// clang-format on
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,
"flat_vol2attn volume request value %f is out of range: should be from 0.0 to -30.0 or "
"-144.0.",
vol);
}
return vol_setting;
}
double dasl_tapered_vol2attn(double vol, long max_db, long min_db) {
// clang-format off
// The "dasl_tapered" volume control profile has the property that halving the AirPlay volume (the "vol" parameter)
// reduces the output level by 10 dB, which corresponds to roughly halving the perceived volume.
// For example, if the AirPlay volume goes from 0.0 to -15.0, the output level will decrease by 10 dB.
// Halving the AirPlay volume again, from -15 to -22.5, will decrease output by a further 10 dB.
// Reducing the AirPlay volume by half again, this time from -22.5 to -25.25 decreases the output by a further 10 dB,
// meaning that at AirPlay volume -25.25, the volume is decreased 30 dB.
// If the attenuation range of the mixer is restricted -- for example, if it is just 30 dB --
// the output level would reach its minimum before the AirPlay volume reached its minimum.
// This would result in part of the AirPlay volume control's range where
// changing the AirPlay volume would make no difference to the output level.
// In the example of an attenuator with a range of 00.dB to -30.0dB, this
// "dead zone" would be from AirPlay volume -30.0 to -25.25,
// i.e. about one sixth of its -30.0 to 0.0 travel.
// To work around this, the "flat" output level is used if it gives a
// higher output dB value than the calculation described above.
// If the device's attenuation range is over about 50 dB,
// the flat output level will hardly be needed at all.
// clang-format on
double vol_setting = min_db; // if all else fails, set this, for safety
if ((vol <= 0.0) && (vol >= -30.0)) {
double vol_pct = 1 - (vol / -30.0); // This will be in the range [0, 1]
if (vol_pct <= 0) {
return min_db;
}
double flat_setting = min_db + (max_db - min_db) * vol_pct;
vol_setting =
max_db + 1000 * log10(vol_pct) / log10(2); // This will be in the range [-inf, max_db]
if (vol_setting < flat_setting) {
debug(3,
"dasl_tapered_vol2attn returning a flat setting of %f for AirPlay volume %f instead of "
"a tapered setting of %f in a range from %f to %f.",
flat_setting, vol, vol_setting, 1.0 * min_db, 1.0 * max_db);
return flat_setting;
}
if (vol_setting > max_db) {
return max_db;
}
return vol_setting;
} else if (vol != -144.0) {
debug(1,
"dasl_tapered volume request value %f is out of range: should be from 0.0 to -30.0 or "
"-144.0.",
vol);
}
return vol_setting;
}
double vol2attn(double vol, long max_db, long min_db) {
// 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.
// 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]) {
if ((-30 - lines[i][0]) == 0.0)
die("(-30 - lines[%d][0]) == 0.0!", i);
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, "vol2attn 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_monotonic_time_in_ns() {
uint64_t time_now_ns;
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
struct timespec tn;
clock_gettime(CLOCK_MONOTONIC, &tn);
uint64_t tnnsec = tn.tv_sec;
tnnsec = tnnsec * 1000000000;
uint64_t tnjnsec = tn.tv_nsec;
time_now_ns = tnnsec + tnjnsec;
#endif
#ifdef COMPILE_FOR_OSX
uint64_t time_now_mach;
static mach_timebase_info_data_t sTimebaseInfo = {0, 0};
// this actually give you a monotonic clock
// see https://news.ycombinator.com/item?id=6303755
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);
}
if (sTimebaseInfo.denom == 0)
die("could not initialise Mac timebase info in get_monotonic_time_in_ns().");
// Do the maths. We hope that the multiplication doesn't
// overflow; the price you pay for working in fixed point.
// this gives us nanoseconds
time_now_ns = time_now_mach * sTimebaseInfo.numer / sTimebaseInfo.denom;
#endif
return time_now_ns;
}
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
// Not defined for macOS
uint64_t get_realtime_in_ns() {
uint64_t time_now_ns;
struct timespec tn;
clock_gettime(CLOCK_REALTIME, &tn);
uint64_t tnnsec = tn.tv_sec;
tnnsec = tnnsec * 1000000000;
uint64_t tnjnsec = tn.tv_nsec;
time_now_ns = tnnsec + tnjnsec;
return time_now_ns;
}
#endif
uint64_t get_absolute_time_in_ns() {
// CLOCK_MONOTONIC_RAW/CLOCK_MONOTONIC in Linux/FreeBSD etc, monotonic in MacOSX
uint64_t time_now_ns;
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
struct timespec tn;
#ifdef CLOCK_MONOTONIC_RAW
clock_gettime(CLOCK_MONOTONIC_RAW, &tn);
#else
clock_gettime(CLOCK_MONOTONIC, &tn);
#endif
uint64_t tnnsec = tn.tv_sec;
tnnsec = tnnsec * 1000000000;
uint64_t tnjnsec = tn.tv_nsec;
time_now_ns = tnnsec + tnjnsec;
#endif
#ifdef COMPILE_FOR_OSX
uint64_t time_now_mach;
static mach_timebase_info_data_t sTimebaseInfo = {0, 0};
// this actually give you a monotonic clock
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.
if (sTimebaseInfo.denom == 0)
die("could not initialise Mac timebase info in get_absolute_time_in_ns().");
// this gives us nanoseconds
time_now_ns = time_now_mach * sTimebaseInfo.numer / sTimebaseInfo.denom;
#endif
return time_now_ns;
}
int try_to_open_pipe_for_writing(const char *pathname) {
// tries to open the pipe in non-blocking mode first.
// if it succeeds, it sets it to blocking.
// if not, it returns -1.
int fdis = open(pathname, O_WRONLY | O_NONBLOCK); // open it in non blocking mode first
// we check that it's not a "real" error. From the "man 2 open" page:
// "ENXIO O_NONBLOCK | O_WRONLY is set, the named file is a FIFO, and no process has the FIFO
// open for reading." Which is okay.
// This is checked by the caller.
if (fdis >= 0) {
// now we switch to blocking mode
int flags = fcntl(fdis, F_GETFL);
if (flags == -1) {
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
debug(1, "try_to_open_pipe -- error %d (\"%s\") getting flags of pipe: \"%s\".", errno,
(char *)errorstring, pathname);
} else {
flags = fcntl(fdis, F_SETFL, flags & ~O_NONBLOCK);
if (flags == -1) {
char errorstring[1024];
strerror_r(errno, (char *)errorstring, sizeof(errorstring));
debug(1, "try_to_open_pipe -- error %d (\"%s\") unsetting NONBLOCK of pipe: \"%s\".", errno,
(char *)errorstring, pathname);
}
}
}
return fdis;
}
/* from
* http://coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring#comment-722
*/
char *str_replace(const char *string, const char *substr, const char *replacement) {
char *tok = NULL;
char *newstr = NULL;
char *oldstr = NULL;
char *head = NULL;
/* if either substr or replacement is NULL, duplicate string a let caller handle it */
if (substr == NULL || replacement == NULL)
return strdup(string);
newstr = strdup(string);
head = newstr;
if (head) {
while ((tok = strstr(head, substr))) {
oldstr = newstr;
newstr = malloc(strlen(oldstr) - strlen(substr) + strlen(replacement) + 1);
/*failed to alloc mem, free old string and return NULL */
if (newstr == NULL) {
free(oldstr);
return NULL;
}
memcpy(newstr, oldstr, tok - oldstr);
memcpy(newstr + (tok - oldstr), replacement, strlen(replacement));
memcpy(newstr + (tok - oldstr) + strlen(replacement), tok + strlen(substr),
strlen(oldstr) - strlen(substr) - (tok - oldstr));
memset(newstr + strlen(oldstr) - strlen(substr) + strlen(replacement), 0, 1);
/* move back head right after the last replacement */
head = newstr + (tok - oldstr) + strlen(replacement);
free(oldstr);
}
} else {
die("failed to allocate memory in str_replace.");
}
return newstr;
}
/* from http://burtleburtle.net/bob/rand/smallprng.html */
// this is not thread-safe, so we need a mutex on it to use it properly.
// always lock use this when accessing the fp_time_at_last_debug_message
pthread_mutex_t r64_mutex = PTHREAD_MUTEX_INITIALIZER;
// typedef uint64_t u8;
typedef struct ranctx {
uint64_t a;
uint64_t b;
uint64_t c;
uint64_t d;
} ranctx;
static struct ranctx rx;
#define rot(x, k) (((x) << (k)) | ((x) >> (64 - (k))))
uint64_t ranval(ranctx *x) {
uint64_t e = x->a - rot(x->b, 7);
x->a = x->b ^ rot(x->c, 13);
x->b = x->c + rot(x->d, 37);
x->c = x->d + e;
x->d = e + x->a;
return x->d;
}
void raninit(ranctx *x, uint64_t seed) {
uint64_t i;
x->a = 0xf1ea5eed, x->b = x->c = x->d = seed;
for (i = 0; i < 20; ++i) {
(void)ranval(x);
}
}
void r64init(uint64_t seed) { raninit(&rx, seed); }
uint64_t r64u() { return (ranval(&rx)); }
int64_t r64i() { return (ranval(&rx) >> 1); }
uint32_t nctohl(const uint8_t *p) { // read 4 characters from *p and do ntohl on them
// this is to avoid possible aliasing violations
uint32_t holder;
memcpy(&holder, p, sizeof(holder));
return ntohl(holder);
}
uint16_t nctohs(const uint8_t *p) { // read 2 characters from *p and do ntohs on them
// this is to avoid possible aliasing violations
uint16_t holder;
memcpy(&holder, p, sizeof(holder));
return ntohs(holder);
}
uint64_t nctoh64(const uint8_t *p) {
uint32_t landing = nctohl(p); // get the high order 32 bits
uint64_t vl = landing;
vl = vl << 32; // shift them into the correct location
landing = nctohl(p + sizeof(uint32_t)); // and the low order 32 bits
uint64_t ul = landing;
vl = vl + ul;
return vl;
}
pthread_mutex_t barrier_mutex = PTHREAD_MUTEX_INITIALIZER;
void memory_barrier() {
pthread_mutex_lock(&barrier_mutex);
pthread_mutex_unlock(&barrier_mutex);
}
void sps_nanosleep(const time_t sec, const long nanosec) {
struct timespec req, rem;
int result;
req.tv_sec = sec;
req.tv_nsec = nanosec;
do {
result = nanosleep(&req, &rem);
rem = req;
} while ((result == -1) && (errno == EINTR));
if (result == -1)
debug(1, "Error in sps_nanosleep of %d sec and %ld nanoseconds: %d.", sec, nanosec, errno);
}
// Mac OS X doesn't have pthread_mutex_timedlock
// Also note that timing must be relative to CLOCK_REALTIME
/*
#ifdef COMPILE_FOR_LINUX_AND_FREEBSD_AND_CYGWIN_AND_OPENBSD
int sps_pthread_mutex_timedlock(pthread_mutex_t *mutex, useconds_t dally_time) {
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
struct timespec timeoutTime;
uint64_t wait_until_time = dally_time * 1000; // to nanoseconds
uint64_t start_time = get_realtime_in_ns(); // this is from CLOCK_REALTIME
wait_until_time = wait_until_time + start_time;
uint64_t wait_until_sec = wait_until_time / 1000000000;
uint64_t wait_until_nsec = wait_until_time % 1000000000;
timeoutTime.tv_sec = wait_until_sec;
timeoutTime.tv_nsec = wait_until_nsec;
int r = pthread_mutex_timedlock(mutex, &timeoutTime);
pthread_setcancelstate(oldState, NULL);
return r;
}
#endif
#ifdef COMPILE_FOR_OSX
*/
int sps_pthread_mutex_timedlock(pthread_mutex_t *mutex, useconds_t dally_time) {
// this would not be not pthread_cancellation safe because is contains a cancellation point
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
int time_to_wait = dally_time;
int r = pthread_mutex_trylock(mutex);
while ((r == EBUSY) && (time_to_wait > 0)) {
int st = time_to_wait;
if (st > 1000)
st = 1000;
sps_nanosleep(0, st * 1000); // this contains a cancellation point
time_to_wait -= st;
r = pthread_mutex_trylock(mutex);
}
pthread_setcancelstate(oldState, NULL);
return r;
}
// #endif
int _debug_mutex_lock(pthread_mutex_t *mutex, useconds_t dally_time, const char *mutexname,
const char *filename, const int line, int debuglevel) {
if ((debuglevel > debuglev) || (debuglevel == 0))
return pthread_mutex_lock(mutex);
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
if (debuglevel != 0)
_debug(filename, line, 3, "mutex_lock \"%s\".", mutexname); // only if you really ask for it!
int result = sps_pthread_mutex_timedlock(mutex, dally_time);
if (result == ETIMEDOUT) {
_debug(
filename, line, debuglevel,
"mutex_lock \"%s\" failed to lock after %f ms -- now waiting unconditionally to lock it.",
mutexname, dally_time * 1E-3);
result = pthread_mutex_lock(mutex);
if (result == 0)
_debug(filename, line, debuglevel, " ...mutex_lock \"%s\" locked successfully.", mutexname);
else
_debug(filename, line, debuglevel, " ...mutex_lock \"%s\" exited with error code: %u",
mutexname, result);
}
pthread_setcancelstate(oldState, NULL);
return result;
}
int _debug_mutex_unlock(pthread_mutex_t *mutex, const char *mutexname, const char *filename,
const int line, int debuglevel) {
if ((debuglevel > debuglev) || (debuglevel == 0))
return pthread_mutex_unlock(mutex);
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
char dstring[1000];
char errstr[512];
memset(dstring, 0, sizeof(dstring));
snprintf(dstring, sizeof(dstring), "%s:%d", filename, line);
debug(debuglevel, "mutex_unlock \"%s\" at \"%s\".", mutexname, dstring);
int r = pthread_mutex_unlock(mutex);
if ((debuglevel != 0) && (r != 0))
debug(1, "error %d: \"%s\" unlocking mutex \"%s\" at \"%s\".", r,
strerror_r(r, errstr, sizeof(errstr)), mutexname, dstring);
pthread_setcancelstate(oldState, NULL);
return r;
}
void malloc_cleanup(void *arg) {
// debug(1, "malloc cleanup freeing %" PRIxPTR ".", arg);
free(arg);
}
#ifdef CONFIG_AIRPLAY_2
void plist_cleanup(void *arg) {
// debug(1, "plist cleanup called.");
plist_free((plist_t)arg);
}
#endif
void socket_cleanup(void *arg) {
intptr_t fdp = (intptr_t)arg;
debug(3, "socket_cleanup called for socket: %" PRIdPTR ".", fdp);
close(fdp);
}
void cv_cleanup(void *arg) {
// debug(1, "cv_cleanup called.");
pthread_cond_t *cv = (pthread_cond_t *)arg;
pthread_cond_destroy(cv);
}
void mutex_cleanup(void *arg) {
// debug(1, "mutex_cleanup called.");
pthread_mutex_t *mutex = (pthread_mutex_t *)arg;
pthread_mutex_destroy(mutex);
}
void mutex_unlock(void *arg) { pthread_mutex_unlock((pthread_mutex_t *)arg); }
void rwlock_unlock(void *arg) { pthread_rwlock_unlock((pthread_rwlock_t *)arg); }
void thread_cleanup(void *arg) {
debug(3, "thread_cleanup called.");
pthread_t *thread = (pthread_t *)arg;
pthread_cancel(*thread);
int oldState;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState);
pthread_join(*thread, NULL);
pthread_setcancelstate(oldState, NULL);
debug(3, "thread_cleanup done.");
}
void pthread_cleanup_debug_mutex_unlock(void *arg) { pthread_mutex_unlock((pthread_mutex_t *)arg); }
char *get_version_string() {
char *version_string = malloc(1024);
if (version_string) {
#ifdef CONFIG_USE_GIT_VERSION_STRING
if (git_version_string[0] != '\0')
strcpy(version_string, git_version_string);
else
#endif
strcpy(version_string, PACKAGE_VERSION);
#ifdef CONFIG_AIRPLAY_2
strcat(version_string, "-AirPlay2");
char smiv[1024];
snprintf(smiv, 1024, "-smi%u", NQPTP_SHM_STRUCTURES_VERSION);
strcat(version_string, smiv);
#endif
#ifdef CONFIG_APPLE_ALAC
strcat(version_string, "-alac");
#endif
#ifdef CONFIG_LIBDAEMON
strcat(version_string, "-libdaemon");
#endif
#ifdef CONFIG_MBEDTLS
strcat(version_string, "-mbedTLS");
#endif
#ifdef CONFIG_POLARSSL
strcat(version_string, "-PolarSSL");
#endif
#ifdef CONFIG_OPENSSL
strcat(version_string, "-OpenSSL");
#endif
#ifdef CONFIG_TINYSVCMDNS
strcat(version_string, "-tinysvcmdns");
#endif
#ifdef CONFIG_AVAHI
strcat(version_string, "-Avahi");
#endif
#ifdef CONFIG_DNS_SD
strcat(version_string, "-dns_sd");
#endif
#ifdef CONFIG_EXTERNAL_MDNS
strcat(version_string, "-external_mdns");
#endif
#ifdef CONFIG_ALSA
strcat(version_string, "-ALSA");
#endif
#ifdef CONFIG_SNDIO
strcat(version_string, "-sndio");
#endif
#ifdef CONFIG_JACK
strcat(version_string, "-jack");
#endif
#ifdef CONFIG_AO
strcat(version_string, "-ao");
#endif
#ifdef CONFIG_PA
strcat(version_string, "-pa");
#endif
#ifdef CONFIG_PW
strcat(version_string, "-pw");
#endif
#ifdef CONFIG_SOUNDIO
strcat(version_string, "-soundio");
#endif
#ifdef CONFIG_DUMMY
strcat(version_string, "-dummy");
#endif
#ifdef CONFIG_STDOUT
strcat(version_string, "-stdout");
#endif
#ifdef CONFIG_PIPE
strcat(version_string, "-pipe");
#endif
#ifdef CONFIG_SOXR
strcat(version_string, "-soxr");
#endif
#ifdef CONFIG_CONVOLUTION
strcat(version_string, "-convolution");
#endif
#ifdef CONFIG_METADATA
strcat(version_string, "-metadata");
#endif
#ifdef CONFIG_MQTT
strcat(version_string, "-mqtt");
#endif
#ifdef CONFIG_DBUS_INTERFACE
strcat(version_string, "-dbus");
#endif
#ifdef CONFIG_MPRIS_INTERFACE
strcat(version_string, "-mpris");
#endif
strcat(version_string, "-sysconfdir:");
strcat(version_string, SYSCONFDIR);
}
return version_string;
}
int64_t generate_zero_frames(char *outp, size_t number_of_frames, sps_format_t format,
int with_dither, int64_t random_number_in) {
// return the last random number used
// assuming the buffer has been assigned
// add a TPDF dither -- see
// http://educypedia.karadimov.info/library/DitherExplained.pdf
// and the discussion around https://www.hydrogenaud.io/forums/index.php?showtopic=16963&st=25
// I think, for a 32 --> 16 bits, the range of
// random numbers needs to be from -2^16 to 2^16, i.e. from -65536 to 65536 inclusive, not from
// -32768 to +32767
// Actually, what would be generated here is from -65535 to 65535, i.e. one less on the limits.
// See the original paper at
// http://www.ece.rochester.edu/courses/ECE472/resources/Papers/Lipshitz_1992.pdf
// by Lipshitz, Wannamaker and Vanderkooy, 1992.
int64_t dither_mask = 0;
switch (format) {
case SPS_FORMAT_S32:
case SPS_FORMAT_S32_LE:
case SPS_FORMAT_S32_BE:
dither_mask = (int64_t)1 << (64 - 32);
break;
case SPS_FORMAT_S24:
case SPS_FORMAT_S24_LE:
case SPS_FORMAT_S24_BE:
case SPS_FORMAT_S24_3LE:
case SPS_FORMAT_S24_3BE:
dither_mask = (int64_t)1 << (64 - 24);
break;
case SPS_FORMAT_S16:
case SPS_FORMAT_S16_LE:
case SPS_FORMAT_S16_BE:
dither_mask = (int64_t)1 << (64 - 16);
break;
case SPS_FORMAT_S8:
case SPS_FORMAT_U8:
dither_mask = (int64_t)1 << (64 - 8);
break;
case SPS_FORMAT_UNKNOWN:
die("Unexpected SPS_FORMAT_UNKNOWN while calculating dither mask.");
break;
case SPS_FORMAT_AUTO:
die("Unexpected SPS_FORMAT_AUTO while calculating dither mask.");
break;
case SPS_FORMAT_INVALID:
die("Unexpected SPS_FORMAT_INVALID while calculating dither mask.");
break;
}
dither_mask -= 1;
int64_t previous_random_number = random_number_in;
char *p = outp;
size_t sample_number;
r64_lock; // the random number generator is not thread safe, so we need to lock it while using it
for (sample_number = 0; sample_number < number_of_frames * 2; sample_number++) {
int64_t hyper_sample = 0;
int64_t r = r64i();
int64_t tpdf = (r & dither_mask) - (previous_random_number & dither_mask);
// add dither if permitted -- no need to check for clipping, as the sample is, uh, zero
if (with_dither != 0)
hyper_sample += tpdf;
// move the result to the desired position in the int64_t
char *op = p;
int sample_length; // this is the length of the sample
switch (format) {
case SPS_FORMAT_S32:
hyper_sample >>= (64 - 32);
*(int32_t *)op = hyper_sample;
sample_length = 4;
break;
case SPS_FORMAT_S32_LE:
*op++ = (uint8_t)(hyper_sample >> (64 - 32)); // 32 bits, ls byte
*op++ = (uint8_t)(hyper_sample >> (64 - 32 + 8)); // 32 bits, less significant middle byte
*op++ = (uint8_t)(hyper_sample >> (64 - 32 + 16)); // 32 bits, more significant middle byte
*op = (uint8_t)(hyper_sample >> (64 - 32 + 24)); // 32 bits, ms byte
sample_length = 4;
break;
case SPS_FORMAT_S32_BE:
*op++ = (uint8_t)(hyper_sample >> (64 - 32 + 24)); // 32 bits, ms byte
*op++ = (uint8_t)(hyper_sample >> (64 - 32 + 16)); // 32 bits, more significant middle byte
*op++ = (uint8_t)(hyper_sample >> (64 - 32 + 8)); // 32 bits, less significant middle byte
*op = (uint8_t)(hyper_sample >> (64 - 32)); // 32 bits, ls byte
sample_length = 4;
break;
case SPS_FORMAT_S24_3LE:
*op++ = (uint8_t)(hyper_sample >> (64 - 24)); // 24 bits, ls byte
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 8)); // 24 bits, middle byte
*op = (uint8_t)(hyper_sample >> (64 - 24 + 16)); // 24 bits, ms byte
sample_length = 3;
break;
case SPS_FORMAT_S24_3BE:
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 16)); // 24 bits, ms byte
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 8)); // 24 bits, middle byte
*op = (uint8_t)(hyper_sample >> (64 - 24)); // 24 bits, ls byte
sample_length = 3;
break;
case SPS_FORMAT_S24:
hyper_sample >>= (64 - 24);
*(int32_t *)op = hyper_sample;
sample_length = 4;
break;
case SPS_FORMAT_S24_LE:
*op++ = (uint8_t)(hyper_sample >> (64 - 24)); // 24 bits, ls byte
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 8)); // 24 bits, middle byte
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 16)); // 24 bits, ms byte
*op = 0;
sample_length = 4;
break;
case SPS_FORMAT_S24_BE:
*op++ = 0;
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 16)); // 24 bits, ms byte
*op++ = (uint8_t)(hyper_sample >> (64 - 24 + 8)); // 24 bits, middle byte
*op = (uint8_t)(hyper_sample >> (64 - 24)); // 24 bits, ls byte
sample_length = 4;
break;
case SPS_FORMAT_S16_LE:
*op++ = (uint8_t)(hyper_sample >> (64 - 16));
*op++ = (uint8_t)(hyper_sample >> (64 - 16 + 8)); // 16 bits, ms byte
sample_length = 2;
break;
case SPS_FORMAT_S16_BE:
*op++ = (uint8_t)(hyper_sample >> (64 - 16 + 8)); // 16 bits, ms byte
*op = (uint8_t)(hyper_sample >> (64 - 16));
sample_length = 2;
break;
case SPS_FORMAT_S16:
*(int16_t *)op = (int16_t)(hyper_sample >> (64 - 16));
sample_length = 2;
break;
case SPS_FORMAT_S8:
*op = (int8_t)(hyper_sample >> (64 - 8));
sample_length = 1;
break;
case SPS_FORMAT_U8:
*op = 128 + (uint8_t)(hyper_sample >> (64 - 8));
sample_length = 1;
break;
default:
sample_length = 0; // stop a compiler warning
die("Unexpected SPS_FORMAT_* with index %d while outputting silence", format);
}
p += sample_length;
previous_random_number = r;
}
r64_unlock;
return previous_random_number;
}
// This will check the incoming string "s" of length "len" with the existing NUL-terminated string
// "str" and update "flag" accordingly.
// Note: if the incoming string length is zero, then the a NULL is used; i.e. no zero-length strings
// are stored.
// If the strings are different, the str is free'd and replaced by a pointer
// to a newly strdup'd string and the flag is set
// If they are the same, the flag is cleared
int string_update_with_size(char **str, int *flag, char *s, size_t len) {
if (*str) {
if ((s) && (len)) {
if ((len != strlen(*str)) || (strncmp(*str, s, len) != 0)) {
free(*str);
//*str = strndup(s, len); // it seems that OpenWrt 12 doesn't have this
char *p = malloc(len + 1);
memcpy(p, s, len);
p[len] = '\0';
*str = p;
*flag = 1;
} else {
*flag = 0;
}
} else {
// old string is non-NULL, new string is NULL or length 0
free(*str);
*str = NULL;
*flag = 1;
}
} else { // old string is NULL
if ((s) && (len)) {
//*str = strndup(s, len); // it seems that OpenWrt 12 doesn't have this
char *p = malloc(len + 1);
memcpy(p, s, len);
p[len] = '\0';
*str = p;
*flag = 1;
} else {
// old string is NULL and new string is NULL or length 0
*flag = 0; // so no change
}
}
return *flag;
}
// from https://stackoverflow.com/questions/13663617/memdup-function-in-c, with thanks
void *memdup(const void *mem, size_t size) {
void *out = malloc(size);
if (out != NULL)
memcpy(out, mem, size);
return out;
}
// This will allocate memory and place the NUL-terminated hex character equivalent of
// the bytearray passed in whose length is given.
char *debug_malloc_hex_cstring(void *packet, size_t nread) {
char *response = malloc(nread * 3 + 1);
unsigned char *q = packet;
char *obfp = response;
size_t obfc;
for (obfc = 0; obfc < nread; obfc++) {
snprintf(obfp, 4, "%02x ", *q);
obfp += 3; // two digit characters and a space
q++;
};
obfp--; // overwrite the last space with a NUL
*obfp = 0;
return response;
}
// the difference between two unsigned 32-bit modulo values as a signed 32-bit result
// now, if the two numbers are constrained to be within 2^(n-1)-1 of one another,
// we can use their as a signed 2^n bit number which will be positive
// if the first number is the same or "after" the second, and
// negative otherwise
int32_t mod32Difference(uint32_t a, uint32_t b) {
int32_t result = a - b;
return result;
}
int get_device_id(uint8_t *id, int int_length) {
uint64_t wait_time = 10000000000L; // wait up to this (ns) long to get a MAC address
int response = -1;
struct ifaddrs *ifaddr = NULL;
struct ifaddrs *ifa = NULL;
int i = 0;
uint8_t *t = id;
for (i = 0; i < int_length; i++) {
*t++ = 0;
}
uint64_t wait_until = get_absolute_time_in_ns();
wait_until = wait_until + wait_time;
int64_t time_to_wait;
do {
if (getifaddrs(&ifaddr) == 0) {
t = id;
int found = 0;
for (ifa = ifaddr; ((ifa != NULL) && (found == 0)); ifa = ifa->ifa_next) {
#ifdef AF_PACKET
if ((ifa->ifa_addr) && (ifa->ifa_addr->sa_family == AF_PACKET)) {
struct sockaddr_ll *s = (struct sockaddr_ll *)ifa->ifa_addr;
if ((strcmp(ifa->ifa_name, "lo") != 0)) {
found = 1;
response = 0;
for (i = 0; ((i < s->sll_halen) && (i < int_length)); i++) {
*t++ = s->sll_addr[i];
}
}
}
#else
#ifdef AF_LINK
struct sockaddr_dl *sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if ((sdl) && (sdl->sdl_family == AF_LINK)) {
if (sdl->sdl_type == IFT_ETHER) {
found = 1;
response = 0;
uint8_t *s = (uint8_t *)LLADDR(sdl);
for (i = 0; ((i < sdl->sdl_alen) && (i < int_length)); i++) {
*t++ = *s++;
}
}
}
#endif
#endif
}
freeifaddrs(ifaddr);
}
// wait a little time if we haven't got a response
if (response != 0) {
usleep(100000);
}
time_to_wait = wait_until - get_absolute_time_in_ns();
} while ((response != 0) && (time_to_wait > 0));
if (response != 0)
warn("Can't create a device ID -- no valid MAC address can be found.");
return response;
}
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