1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/.hgignore	Fri May 13 21:03:06 2016 +0300
     1.3 @@ -0,0 +1,7 @@
     1.4 +syntax: glob
     1.5 +*.au
     1.6 +*.o
     1.7 +*.d
     1.8 +*.aup
     1.9 +*.swp
    1.10 +dtms

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/Makefile	Fri May 13 21:03:06 2016 +0300
     2.3 @@ -0,0 +1,24 @@
     2.4 +src = $(wildcard src/*.c)
     2.5 +obj = $(src:.c=.o)
     2.6 +dep = $(obj:.o=.d)
     2.7 +bin = dtms
     2.8 +
     2.9 +dbg = -g
    2.10 +opt = -O0
    2.11 +
    2.12 +CC = gcc
    2.13 +INCLUDE = -I/usr/include
    2.14 +CFLAGS = -pedantic -Wall -std=c99 -D_XOPEN_SOURCE=600 $(dbg) $(INCLUDE)
    2.15 +LDFLAGS = -L/usr/lib $(libs)
    2.16 +
    2.17 +$(bin): $(obj)
    2.18 +	$(CC) -o $@ $(obj) $(LDFLAGS)
    2.19 +
    2.20 +-include $(dep)
    2.21 +
    2.22 +%.d: %.c
    2.23 +	@$(CPP) $(CFLAGS) $< -MM -MT $(@:.d=.o) >$@
    2.24 +
    2.25 +.PHONY: clean
    2.26 +clean:
    2.27 +	rm -f $(obj) $(bin) $(dep)

     3.1 Binary file data/dtms.mp3 has changed

     4.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     4.2 +++ b/src/main.c	Fri May 13 21:03:06 2016 +0300
     4.3 @@ -0,0 +1,156 @@
     4.4 +#include <errno.h>
     4.5 +#include <fcntl.h>
     4.6 +#include <pwd.h>
     4.7 +#include <stdio.h>
     4.8 +#include <stdlib.h>
     4.9 +#include <string.h>
    4.10 +#include <sys/select.h>
    4.11 +#include <sys/stat.h>
    4.12 +#include <sys/types.h>
    4.13 +#include <time.h>
    4.14 +#include <unistd.h>
    4.15 +
    4.16 +static int parse_args(int argc, char **argv);
    4.17 +static void print_help();
    4.18 +static void check_device(char *device_path);
    4.19 +static char* concatenate(char *mp_path, char *data_path);
    4.20 +
    4.21 +static int uid;
    4.22 +static char *path;
    4.23 +static char *dev_path;
    4.24 +
    4.25 +int main(int argc, char **argv)
    4.26 +{
    4.27 +    time_t last_touch_time = 0;
    4.28 +    int fd;
    4.29 +
    4.30 +    if(parse_args(argc, argv))
    4.31 +	return 1;
    4.32 +
    4.33 +    check_device(dev_path);
    4.34 +
    4.35 +    if((fd = open(dev_path, O_RDONLY | O_NONBLOCK)) == -1) {
    4.36 +	fprintf(stderr, "Failed to open device: %s, error: %s\n", dev_path, strerror(errno));
    4.37 +	return 1;
    4.38 +    }
    4.39 +
    4.40 +    if(seteuid(uid) == -1) {
    4.41 +	perror("Set uid failed");
    4.42 +	uid = 0;
    4.43 +    }
    4.44 +
    4.45 +    if(!uid) {
    4.46 +	const char *st = "/";
    4.47 +	if(strncmp(path, st, 1) != 0) {
    4.48 +	    fprintf(stderr, "If you run this program as root you should pass the absolute path to a valid mp3 player.\n");
    4.49 +	    return 1;
    4.50 +	}
    4.51 +    }
    4.52 +
    4.53 +    while(1) {
    4.54 +	fd_set read_set;
    4.55 +	FD_ZERO(&read_set);
    4.56 +	FD_SET(fd, &read_set);
    4.57 +
    4.58 +	int res;
    4.59 +	while((res = select(fd + 1, &read_set, 0, 0, 0)) == -1 && errno == EINTR);
    4.60 +	if(res < 0) {
    4.61 +	    perror("Select failed");
    4.62 +	    break;
    4.63 +	}
    4.64 +	if(res == 0) //nothing to read
    4.65 +	    continue;
    4.66 +
    4.67 +	if(FD_ISSET(fd, &read_set)) {
    4.68 +	    char buf[1024];
    4.69 +	    time_t now = time(0);
    4.70 +	    while(read(fd, buf, sizeof buf) > 0);
    4.71 +	    if (now - last_touch_time > 2) {
    4.72 +		char *cmd = concatenate(path, "data/dtms.mp3");
    4.73 +		system(cmd);
    4.74 +		last_touch_time = now;
    4.75 +	    }
    4.76 +	}
    4.77 +    }
    4.78 +    close(fd);
    4.79 +}
    4.80 +
    4.81 +static int parse_args(int argc, char **argv)
    4.82 +{
    4.83 +    for(int i=1; i<argc; i++) {
    4.84 +	if((strcmp(argv[i], "-h") == 0)) {
    4.85 +	    print_help();
    4.86 +	    exit(0);
    4.87 +	}
    4.88 +	if((strcmp(argv[i], "-p") == 0)) {
    4.89 +	    if(argv[i+1]) {
    4.90 +		path = argv[i+1];
    4.91 +	    }
    4.92 +	    else {
    4.93 +		fprintf(stderr, "Invalid path. Please give the absolute path to an mp3 player.\n");
    4.94 +		exit(1);
    4.95 +	    }
    4.96 +	}
    4.97 +
    4.98 +	if((strcmp(argv[i], "-u") == 0)) {
    4.99 +	    if(argv[i+1]) {
   4.100 +		struct passwd *passwd = getpwnam(argv[i+1]);
   4.101 +		if(!passwd) {
   4.102 +		    fprintf(stderr, "Failed to get uid for: %s : %s.\n", argv[i+1], strerror(errno));
   4.103 +		    exit(1);
   4.104 +		}
   4.105 +		uid = passwd->pw_uid;
   4.106 +	    }
   4.107 +	    else {
   4.108 +		fprintf(stderr, "Invalid username. Type -u `whoami`.\n");
   4.109 +		exit(1);
   4.110 +	    }
   4.111 +	}
   4.112 +	if((strcmp(argv[i], "-d") == 0)) {
   4.113 +	    if(argv[i+1]) {
   4.114 +		dev_path = argv[i+1];
   4.115 +	    }
   4.116 +	    else {
   4.117 +		fprintf(stderr, "Invalid device file.\n");
   4.118 +		exit(1);
   4.119 +	    }
   4.120 +	}
   4.121 +    }
   4.122 +    return 0;
   4.123 +}
   4.124 +
   4.125 +static void print_help()
   4.126 +{
   4.127 +    printf("Options:\n");
   4.128 +    printf("-h, prints this help\n");
   4.129 +    printf("-d, path to the device\n");
   4.130 +    printf("-p, path to the mp3 player\n");
   4.131 +    printf("-u. username of the user that runs the program\n");
   4.132 +    printf("--------\n");
   4.133 +    printf("Examples:\n");
   4.134 +    printf("--------\n");
   4.135 +    printf("./dtms -d /dev/usb/hiddev0 -u eleni -p /usr/bin/mpv\n");
   4.136 +}
   4.137 +
   4.138 +static void check_device(char *device_path)
   4.139 +{
   4.140 +    struct stat sb;
   4.141 +    if(stat(dev_path, &sb) == -1) {
   4.142 +	perror("stat");
   4.143 +	exit(0);
   4.144 +    }
   4.145 +    if(((sb.st_mode & S_IFMT) != S_IFBLK) && ((sb.st_mode & S_IFMT) != S_IFCHR)) {
   4.146 +	fprintf(stderr, "Invalid device file.\n");
   4.147 +	exit(0);
   4.148 +    }
   4.149 +}
   4.150 +
   4.151 +static char *concatenate(char *mp_path, char *data_path)
   4.152 +{
   4.153 +    char *res = malloc(strlen(mp_path) + 1 + strlen(data_path) + 1);
   4.154 +    strcpy(res, mp_path);
   4.155 +    strcat(res, " ");
   4.156 +    strcat(res, data_path);
   4.157 +
   4.158 +    return res;
   4.159 +}