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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
* 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 HAVE_LIBSSL
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#endif
#ifdef HAVE_LIBPOLARSSL
#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 HAVE_LIBMBEDTLS
#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
#include <libdaemon/dlog.h>
#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;
shairport_cfg config;
int debuglev = 0;
sigset_t pselect_sigset;
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, ...) {
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))
daemon_log(LOG_EMERG, "|% 20.9f|% 20.9f|*fatal error: %s", tss, tsl, s);
else if ((debuglev) && (config.debugger_show_relative_time))
daemon_log(LOG_EMERG, "% 20.9f|*fatal error: %s", tsl, s);
else if ((debuglev) && (config.debugger_show_elapsed_time))
daemon_log(LOG_EMERG, "% 20.9f|*fatal error: %s", tss, s);
else
daemon_log(LOG_EMERG, "fatal error: %s", s);
shairport_shutdown();
exit(1);
}
void warn(const char *format, ...) {
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))
daemon_log(LOG_WARNING, "|% 20.9f|% 20.9f|*warning: %s", tss, tsl, s);
else if ((debuglev) && (config.debugger_show_relative_time))
daemon_log(LOG_WARNING, "% 20.9f|*warning: %s", tsl, s);
else if ((debuglev) && (config.debugger_show_elapsed_time))
daemon_log(LOG_WARNING, "% 20.9f|*warning: %s", tss, s);
else
daemon_log(LOG_WARNING, "%s", s);
}
void debug(int level, const char *format, ...) {
if (level > debuglev)
return;
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))
daemon_log(LOG_DEBUG, "|% 20.9f|% 20.9f|%s", tss, tsl, s);
else if (config.debugger_show_relative_time)
daemon_log(LOG_DEBUG, "% 20.9f|%s", tsl, s);
else if (config.debugger_show_elapsed_time)
daemon_log(LOG_DEBUG, "% 20.9f|%s", tss, s);
else
daemon_log(LOG_DEBUG, "%s", s);
}
void inform(const char *format, ...) {
char s[1024];
s[0] = 0;
va_list args;
va_start(args, format);
vsnprintf(s, sizeof(s), format, args);
va_end(args);
daemon_log(LOG_INFO, "%s", s);
}
// 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 HAVE_LIBMBEDTLS
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 HAVE_LIBPOLARSSL
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 HAVE_LIBSSL
char *base64_enc(uint8_t *input, int length) {
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);
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(bmem);
return buf;
}
uint8_t *base64_dec(char *input, int *outlen) {
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);
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(bmem);
*outlen = nread;
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 HAVE_LIBSSL
uint8_t *rsa_apply(uint8_t *input, int inlen, int *outlen, int mode) {
static 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");
}
return out;
}
#endif
#ifdef HAVE_LIBMBEDTLS
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 HAVE_LIBPOLARSSL
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
void command_set_volume(double volume) {
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) {
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) {
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_stop(void) {
if (config.cmd_stop) {
/*Spawn a child to run the program.*/
pid_t pid = fork();
if (pid == 0) { /* child process */
int argC;
char **argV;
// debug(1,"on-stop command found.");
if (poptParseArgvString(config.cmd_stop, &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-stop command arguments");
else {
// debug(1,"Executing on-stop command %s",config.cmd_stop);
execv(argV[0], argV);
warn("Execution of on-stop command failed to start");
debug(1, "Error executing on-stop command %s", config.cmd_stop);
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-stop command returned an error.");
debug(1, "Stop command %s finished with error %d", config.cmd_stop, errno);
}
}
// debug(1,"Continue after on-stop command");
}
}
}
// 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);
time_now_fp =
((uint64_t)tn.tv_sec << 32) + ((uint64_t)tn.tv_nsec << 32) / 1000000000; // 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(int fd, const void *buf, size_t count) {
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, 5000);
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 = -1;
} 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);
}
/* 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 */
// 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); }
/* generate an array of 64-bit random numbers */
const int ranarraylength = 1009; // these will be 8-byte numbers.
uint64_t *ranarray;
int ranarraynext;
void ranarrayinit() {
ranarray = (uint64_t *)malloc(ranarraylength * sizeof(uint64_t));
if (ranarray) {
int i;
for (i = 0; i < ranarraylength; i++)
ranarray[i] = r64u();
ranarraynext = 0;
} else {
die("failed to allocate space for the ranarray.");
}
}
uint64_t ranarrayval() {
uint64_t v = ranarray[ranarraynext];
ranarraynext++;
ranarraynext = ranarraynext % ranarraylength;
return v;
}
void r64arrayinit() { ranarrayinit(); }
uint64_t ranarray64u() { return (ranarrayval()); }
int64_t ranarray64i() { return (ranarrayval() >> 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);
}
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);