git.sur5r.net Git - i3/i3status/blob - wmiistatus.c

   1 /*
   2  * Generates a status line for use with wmii or other minimal window managers
   3  *
   4  *
   5  * Copyright (c) 2008-2009 Michael Stapelberg and contributors
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without modification,
   9  * are permitted provided that the following conditions are met:
  10  *
  11  * * Redistributions of source code must retain the above copyright notice, this
  12  *   list of conditions and the following disclaimer.
  13  *
  14  * * Redistributions in binary form must reproduce the above copyright notice, this
  15  *   list of conditions and the following disclaimer in the documentation and/or other
  16  *   materials provided with the distribution.
  17  *
  18  * * Neither the name of Michael Stapelberg nor the names of contributors
  19  *   may be used to endorse or promote products derived from this software without
  20  *   specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  23  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  25  * SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  27  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  31  * DAMAGE.
  32  *
  33  */
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <fcntl.h>
  37 #include <string.h>
  38 #include <stdio.h>
  39 #include <time.h>
  40 #include <stdbool.h>
  41 #include <stdarg.h>
  42 #include <unistd.h>
  43 #include <stdlib.h>
  44 #include <ctype.h>
  45 #include <net/if.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <glob.h>
  51 #include <dirent.h>
  52 #include <getopt.h>
  53 #include <linux/ethtool.h>
  54 #include <linux/sockios.h>
  55
  56
  57 #define _IS_WMIISTATUS_C
  58 #include "wmiistatus.h"
  59 #undef _IS_WMIISTATUS_C
  60 #include "config.h"
  61
  62 /* socket file descriptor for general purposes */
  63 static int general_socket;
  64
  65 /*
  66  * This function just concats two strings in place, it should only be used
  67  * for concatting order to the name of a file or concatting color codes.
  68  * Otherwise, the buffer size would have to be increased.
  69  *
  70  */
  71 static char *concat(const char *str1, const char *str2) {
  72         static char concatbuf[32];
  73         (void)snprintf(concatbuf, sizeof(concatbuf), "%s%s", str1, str2);
  74         return concatbuf;
  75 }
  76
  77 /*
  78  * Cleans wmii's /rbar directory by deleting all regular files
  79  *
  80  */
  81 static void cleanup_rbar_dir() {
  82         struct dirent *ent;
  83         DIR *dir;
  84         char pathbuf[strlen(wmii_path)+256+1];
  85
  86         if ((dir = opendir(wmii_path)) == NULL)
  87                 exit(EXIT_FAILURE);
  88
  89         while ((ent = readdir(dir)) != NULL) {
  90                 if (ent->d_type == DT_REG) {
  91                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, ent->d_name);
  92                         if (unlink(pathbuf) == -1)
  93                                 exit(EXIT_FAILURE);
  94                 }
  95         }
  96
  97         (void)closedir(dir);
  98 }
  99
 100 /*
 101  * Creates the specified file in wmii's /rbar directory with
 102  * correct modes and initializes colors if colormode is enabled
 103  * '
 104  */
 105 static void create_file(const char *name) {
 106         char pathbuf[strlen(wmii_path)+256+1];
 107         int fd;
 108         int flags = O_CREAT | O_WRONLY;
 109         struct stat statbuf;
 110
 111         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, name);
 112
 113         /* Overwrite file's contents if it exists */
 114         if (stat(pathbuf, &statbuf) >= 0)
 115                 flags |= O_TRUNC;
 116
 117         if ((fd = open(pathbuf, flags, S_IRUSR | S_IWUSR)) < 0)
 118                 exit(EXIT_FAILURE);
 119         if (use_colors) {
 120                 char *tmp = concat("#888888 ", wmii_normcolors);
 121                 if (write(fd, tmp, strlen(tmp)) != (ssize_t)strlen(tmp))
 122                         exit(EXIT_FAILURE);
 123         }
 124         (void)close(fd);
 125 }
 126
 127 /*
 128  * Waits until wmii_path/rbar exists (= the filesystem gets mounted),
 129  * cleans up all files and creates the needed files
 130  *
 131  */
 132 static void setup(void) {
 133         unsigned int i;
 134         struct stat statbuf;
 135         char pathbuf[512];
 136
 137         /* Wait until wmii_path/rbar exists */
 138         for (; stat(wmii_path, &statbuf) < 0; sleep(interval));
 139
 140         cleanup_rbar_dir();
 141         if (wlan_interface)
 142                 create_file(concat(order[ORDER_WLAN],"wlan"));
 143         if (eth_interface)
 144                 create_file(concat(order[ORDER_ETH],"eth"));
 145         if (battery_path)
 146                 create_file(concat(order[ORDER_BATTERY],"battery"));
 147         create_file(concat(order[ORDER_LOAD],"load"));
 148         if (time_format)
 149                 create_file(concat(order[ORDER_TIME],"time"));
 150         for (i = 0; i < num_run_watches; i += 2) {
 151                 snprintf(pathbuf, sizeof(pathbuf), "%s%s", order[ORDER_RUN], run_watches[i]);
 152                 create_file(pathbuf);
 153         }
 154
 155 }
 156
 157 /*
 158  * Writes the given message in the corresponding file in wmii's /rbar directory
 159  *
 160  */
 161 static void write_to_statusbar(const char *name, const char *message) {
 162         char pathbuf[strlen(wmii_path)+256+1];
 163         int fd;
 164
 165         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, name);
 166         if ((fd = open(pathbuf, O_RDWR)) == -1) {
 167                 /* Try to re-setup stuff and just continue */
 168                 setup();
 169                 return;
 170         }
 171         if (write(fd, message, strlen(message)) != (ssize_t)strlen(message))
 172                 exit(EXIT_FAILURE);
 173         (void)close(fd);
 174 }
 175
 176 /*
 177  * Writes an errormessage to statusbar
 178  *
 179  */
 180 static void write_error_to_statusbar(const char *message) {
 181         cleanup_rbar_dir();
 182         create_file("error");
 183         write_to_statusbar("error", message);
 184 }
 185
 186 /*
 187  * Write errormessage to statusbar and exit
 188  *
 189  */
 190 void die(const char *fmt, ...) {
 191         char buffer[512];
 192         va_list ap;
 193         va_start(ap, fmt);
 194         (void)vsnprintf(buffer, sizeof(buffer), fmt, ap);
 195         va_end(ap);
 196
 197         if (wmii_path != NULL)
 198                 write_error_to_statusbar(buffer);
 199         exit(EXIT_FAILURE);
 200 }
 201
 202 /*
 203  * Skip the given character for maximum 'amount' times, returns
 204  * a pointer to the first non-'character' character in 'input'.
 205  *
 206  */
 207 static char *skip_character(char *input, char character, int amount) {
 208         char *walk;
 209         size_t len = strlen(input);
 210         int blanks = 0;
 211
 212         for (walk = input; ((size_t)(walk - input) < len) && (blanks < amount); walk++)
 213                 if (*walk == character)
 214                         blanks++;
 215
 216         return (walk == input ? walk : walk-1);
 217 }
 218
 219 /*
 220  * Get battery information from /sys. Note that it uses the design capacity to
 221  * calculate the percentage, not the last full capacity, so you can see how
 222  * worn off your battery is.
 223  *
 224  */
 225 static char *get_battery_info() {
 226         char buf[1024];
 227         static char part[512];
 228         char *walk, *last;
 229         int fd;
 230         int full_design = -1,
 231             remaining = -1,
 232             present_rate = -1;
 233         charging_status_t status = CS_DISCHARGING;
 234
 235         if ((fd = open(battery_path, O_RDONLY)) == -1)
 236                 return "No battery found";
 237
 238         memset(part, 0, sizeof(part));
 239         (void)read(fd, buf, sizeof(buf));
 240         for (walk = buf, last = buf; (walk-buf) < 1024; walk++)
 241                 if (*walk == '=') {
 242                         if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN") ||
 243                             BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN"))
 244                                 full_design = atoi(walk+1);
 245                         else if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW") ||
 246                                  BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW"))
 247                                 remaining = atoi(walk+1);
 248                         else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
 249                                 present_rate = atoi(walk+1);
 250                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
 251                                 status = CS_CHARGING;
 252                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
 253                                 status = CS_FULL;
 254                 } else if (*walk == '\n')
 255                         last = walk+1;
 256         (void)close(fd);
 257
 258         if ((full_design != -1) && (remaining != -1) && (present_rate != -1)) {
 259                 float remaining_time, perc;
 260                 int seconds, hours, minutes;
 261                 if (status == CS_CHARGING)
 262                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
 263                 else if (status == CS_DISCHARGING)
 264                         remaining_time = ((float)remaining / (float)present_rate);
 265                 else {
 266                         (void)snprintf(part, sizeof(part), "FULL");
 267                         return part;
 268                 }
 269                 perc = ((float)remaining / (float)full_design);
 270
 271                 seconds = (int)(remaining_time * 3600.0);
 272                 hours = seconds / 3600;
 273                 seconds -= (hours * 3600);
 274                 minutes = seconds / 60;
 275                 seconds -= (minutes * 60);
 276
 277                 (void)snprintf(part, sizeof(part), "%s %.02f%% %02d:%02d:%02d",
 278                         (status == CS_CHARGING? "CHR" : "BAT"),
 279                         (perc * 100), hours, minutes, seconds);
 280         }
 281         return part;
 282 }
 283
 284 /*
 285  * Just parses /proc/net/wireless
 286  *
 287  */
 288 static char *get_wireless_info() {
 289         char buf[1024];
 290         static char part[512];
 291         char *interfaces;
 292         int fd;
 293         memset(buf, 0, sizeof(buf));
 294         memset(part, 0, sizeof(part));
 295
 296         if ((fd = open("/proc/net/wireless", O_RDONLY)) == -1)
 297                 die("Could not open /proc/net/wireless");
 298         (void)read(fd, buf, sizeof(buf));
 299         (void)close(fd);
 300
 301         interfaces = skip_character(buf, '\n', 2) + 1;
 302         while (interfaces < buf+strlen(buf)) {
 303                 while (isspace((int)*interfaces))
 304                         interfaces++;
 305                 if (strncmp(interfaces, wlan_interface, strlen(wlan_interface)) == 0) {
 306                         int quality;
 307                         /* Skip status field (0000) */
 308                         interfaces += strlen(wlan_interface) + 2;
 309                         interfaces = skip_character(interfaces, ' ', 1);
 310                         while (isspace((int)*interfaces))
 311                                 interfaces++;
 312                         quality = atoi(interfaces);
 313                         /* For some reason, I get 255 sometimes */
 314                         if ((quality == 255) || (quality == 0)) {
 315                         if (use_colors)
 316                                 (void)snprintf(part, sizeof(part), "%s%s", concat("#FF0000 ", wmii_normcolors), " W: down");
 317                         else (void)snprintf(part, sizeof(part), "W: down");
 318
 319                         } else {
 320                                 const char *ip_address;
 321                                 (void)snprintf(part, sizeof(part), "W: (%03d%%) ", quality);
 322                                 ip_address = get_ip_address(wlan_interface);
 323                                 strcpy(part+strlen(part), ip_address);
 324                         }
 325
 326                         return part;
 327                 }
 328                 interfaces = skip_character(interfaces, '\n', 1) + 1;
 329         }
 330
 331         return part;
 332 }
 333
 334 /*
 335  * Return the IP address for the given interface or "no IP" if the
 336  * interface is up and running but hasn't got an IP address yet
 337  *
 338  */
 339 static const char *get_ip_address(const char *interface) {
 340         static char part[512];
 341         struct ifreq ifr;
 342         struct sockaddr_in addr;
 343         socklen_t len = sizeof(struct sockaddr_in);
 344         memset(part, 0, sizeof(part));
 345
 346         (void)strcpy(ifr.ifr_name, interface);
 347         ifr.ifr_addr.sa_family = AF_INET;
 348         if (ioctl(general_socket, SIOCGIFADDR, &ifr) < 0)
 349                 return NULL;
 350
 351         memcpy(&addr, &ifr.ifr_addr, len);
 352         (void)inet_ntop(AF_INET, &addr.sin_addr.s_addr, part, len);
 353         if (strlen(part) == 0)
 354                 (void)snprintf(part, sizeof(part), "no IP");
 355
 356         return part;
 357 }
 358
 359 /*
 360  * Combines ethernet IP addresses and speed (if requested) for displaying
 361  *
 362  */
 363 static char *get_eth_info() {
 364         static char part[512];
 365         const char *ip_address = get_ip_address(eth_interface);
 366         int ethspeed = 0;
 367
 368         if (get_ethspeed) {
 369                 /* This code path requires root privileges */
 370                 struct ifreq ifr;
 371                 struct ethtool_cmd ecmd;
 372                 int err;
 373
 374                 ecmd.cmd = ETHTOOL_GSET;
 375                 (void)memset(&ifr, 0, sizeof(ifr));
 376                 ifr.ifr_data = (caddr_t)&ecmd;
 377                 (void)strcpy(ifr.ifr_name, eth_interface);
 378                 if ((err = ioctl(general_socket, SIOCETHTOOL, &ifr)) == 0)
 379                         ethspeed = (ecmd.speed == 65535 ? 0 : ecmd.speed);
 380                 else get_ethspeed = false;
 381         }
 382
 383         if (ip_address == NULL)
 384                 (void)snprintf(part, sizeof(part), "E: down");
 385         else {
 386                 if (get_ethspeed)
 387                         (void)snprintf(part, sizeof(part), "E: %s (%d Mbit/s)", ip_address, ethspeed);
 388                 else (void)snprintf(part, sizeof(part), "E: %s", ip_address);
 389         }
 390
 391         return part;
 392 }
 393
 394 /*
 395  * Checks if the PID in path is still valid by checking if /proc/<pid> exists
 396  *
 397  */
 398 static bool process_runs(const char *path) {
 399         char pidbuf[512],
 400              procbuf[512],
 401              *walk;
 402         ssize_t n;
 403         static glob_t globbuf;
 404         struct stat statbuf;
 405         const char *real_path;
 406         int fd;
 407
 408         if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
 409                 die("glob() failed");
 410         real_path = (globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : path);
 411         fd = open(real_path, O_RDONLY);
 412         globfree(&globbuf);
 413         if (fd < 0)
 414                 return false;
 415         if ((n = read(fd, pidbuf, sizeof(pidbuf))) > 0)
 416                 pidbuf[n] = '\0';
 417         (void)close(fd);
 418         for (walk = pidbuf; *walk != '\0'; walk++)
 419                 if (!isdigit((int)(*walk))) {
 420                         *walk = '\0';
 421                         break;
 422                 }
 423         (void)snprintf(procbuf, sizeof(procbuf), "/proc/%s", pidbuf);
 424         return (stat(procbuf, &statbuf) >= 0);
 425 }
 426
 427 int main(int argc, char *argv[]) {
 428         char part[512],
 429              pathbuf[512],
 430              *end;
 431         unsigned int i;
 432         int load_avg;
 433
 434         char *configfile = PREFIX "/etc/wmiistatus.conf";
 435         int o, option_index = 0;
 436         struct option long_options[] = {
 437                 {"config", required_argument, 0, 'c'},
 438                 {0, 0, 0, 0}
 439         };
 440
 441         while ((o = getopt_long(argc, argv, "c:", long_options, &option_index)) != -1)
 442                 if ((char)o == 'c')
 443                         configfile = optarg;
 444
 445         if (load_configuration(configfile) < 0)
 446                 return EXIT_FAILURE;
 447
 448         setup();
 449
 450         if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
 451                 die("Could not create socket");
 452
 453         while (1) {
 454                 for (i = 0; i < num_run_watches; i += 2) {
 455                         bool running = process_runs(run_watches[i+1]);
 456                         if (use_colors)
 457                                 snprintf(part, sizeof(part), "%s %s: %s",
 458                                         (running ?
 459                                                 concat("#00FF00 ", wmii_normcolors) :
 460                                                 concat("#FF0000 ", wmii_normcolors)),
 461                                         run_watches[i],
 462                                         (running ? "yes" : "no"));
 463                         else snprintf(part, sizeof(part), "%s: %s", run_watches[i], (running ? "yes" : "no"));
 464                         snprintf(pathbuf, sizeof(pathbuf), "%s%s", order[ORDER_RUN], run_watches[i]);
 465                         write_to_statusbar(pathbuf, part);
 466                 }
 467
 468                 if (wlan_interface)
 469                         write_to_statusbar(concat(order[ORDER_WLAN], "wlan"), get_wireless_info());
 470                 if (eth_interface)
 471                         write_to_statusbar(concat(order[ORDER_ETH], "eth"), get_eth_info());
 472                 if (battery_path)
 473                         write_to_statusbar(concat(order[ORDER_BATTERY], "battery"), get_battery_info());
 474
 475                 /* Get load */
 476                 if ((load_avg = open("/proc/loadavg", O_RDONLY)) == -1)
 477                         die("Could not open /proc/loadavg");
 478                 (void)read(load_avg, part, sizeof(part));
 479                 (void)close(load_avg);
 480                 end = skip_character(part, ' ', 3);
 481                 *end = '\0';
 482                 write_to_statusbar(concat(order[ORDER_LOAD], "load"), part);
 483
 484                 if (time_format) {
 485                         /* Get date & time */
 486                         time_t current_time = time(NULL);
 487                         struct tm *current_tm = localtime(&current_time);
 488                         (void)strftime(part, sizeof(part), time_format, current_tm);
 489                         write_to_statusbar(concat(order[ORDER_TIME], "time"), part);
 490                 }
 491
 492                 sleep(interval);
 493         }
 494 }