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 /*
  63  * This function just concats two strings in place, it should only be used
  64  * for concatting order to the name of a file or concatting color codes.
  65  * Otherwise, the buffer size would have to be increased.
  66  *
  67  */
  68 static char *concat(const char *str1, const char *str2) {
  69         static char concatbuf[32];
  70         (void)snprintf(concatbuf, sizeof(concatbuf), "%s%s", str1, str2);
  71         return concatbuf;
  72 }
  73
  74 /*
  75  * Cleans wmii's /rbar directory by deleting all regular files
  76  *
  77  */
  78 static void cleanup_rbar_dir() {
  79         struct dirent *ent;
  80         DIR *dir;
  81         char pathbuf[strlen(wmii_path)+256+1];
  82
  83         if ((dir = opendir(wmii_path)) == NULL)
  84                 exit(EXIT_FAILURE);
  85
  86         while ((ent = readdir(dir)) != NULL) {
  87                 if (ent->d_type == DT_REG) {
  88                         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, ent->d_name);
  89                         if (unlink(pathbuf) == -1)
  90                                 exit(EXIT_FAILURE);
  91                 }
  92         }
  93
  94         (void)closedir(dir);
  95 }
  96
  97 /*
  98  * Creates the specified file in wmii's /rbar directory with
  99  * correct modes and initializes colors if colormode is enabled
 100  * '
 101  */
 102 static void create_file(const char *name) {
 103         char pathbuf[strlen(wmii_path)+256+1];
 104         int fd;
 105         int flags = O_CREAT | O_WRONLY;
 106         struct stat statbuf;
 107
 108         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, name);
 109
 110         /* Overwrite file's contents if it exists */
 111         if (stat(pathbuf, &statbuf) >= 0)
 112                 flags |= O_TRUNC;
 113
 114         if ((fd = open(pathbuf, flags, S_IRUSR | S_IWUSR)) < 0)
 115                 exit(EXIT_FAILURE);
 116         if (use_colors) {
 117                 char *tmp = concat("#888888 ", wmii_normcolors);
 118                 if (write(fd, tmp, strlen(tmp)) != (ssize_t)strlen(tmp))
 119                         exit(EXIT_FAILURE);
 120         }
 121         (void)close(fd);
 122 }
 123
 124 /*
 125  * Waits until wmii_path/rbar exists (= the filesystem gets mounted),
 126  * cleans up all files and creates the needed files
 127  *
 128  */
 129 static void setup(void) {
 130         unsigned int i;
 131         struct stat statbuf;
 132         char pathbuf[512];
 133
 134         /* Wait until wmii_path/rbar exists */
 135         for (; stat(wmii_path, &statbuf) < 0; sleep(interval));
 136
 137         cleanup_rbar_dir();
 138         if (wlan_interface)
 139                 create_file(concat(order[ORDER_WLAN],"wlan"));
 140         if (eth_interface)
 141                 create_file(concat(order[ORDER_ETH],"eth"));
 142         if (battery_path)
 143                 create_file(concat(order[ORDER_BATTERY],"battery"));
 144         create_file(concat(order[ORDER_LOAD],"load"));
 145         if (time_format)
 146                 create_file(concat(order[ORDER_TIME],"time"));
 147         for (i = 0; i < num_run_watches; i += 2) {
 148                 snprintf(pathbuf, sizeof(pathbuf), "%s%s", order[ORDER_RUN], run_watches[i]);
 149                 create_file(pathbuf);
 150         }
 151
 152 }
 153
 154 /*
 155  * Writes the given message in the corresponding file in wmii's /rbar directory
 156  *
 157  */
 158 static void write_to_statusbar(const char *name, const char *message) {
 159         char pathbuf[strlen(wmii_path)+256+1];
 160         int fd;
 161
 162         (void)snprintf(pathbuf, sizeof(pathbuf), "%s%s", wmii_path, name);
 163         if ((fd = open(pathbuf, O_RDWR)) == -1) {
 164                 /* Try to re-setup stuff and just continue */
 165                 setup();
 166                 return;
 167         }
 168         if (write(fd, message, strlen(message)) != (ssize_t)strlen(message))
 169                 exit(EXIT_FAILURE);
 170         (void)close(fd);
 171 }
 172
 173 /*
 174  * Writes an errormessage to statusbar
 175  *
 176  */
 177 static void write_error_to_statusbar(const char *message) {
 178         cleanup_rbar_dir();
 179         create_file("error");
 180         write_to_statusbar("error", message);
 181 }
 182
 183 /*
 184  * Write errormessage to statusbar and exit
 185  *
 186  */
 187 void die(const char *fmt, ...) {
 188         char buffer[512];
 189         va_list ap;
 190         va_start(ap, fmt);
 191         (void)vsnprintf(buffer, sizeof(buffer), fmt, ap);
 192         va_end(ap);
 193
 194         if (wmii_path != NULL)
 195                 write_error_to_statusbar(buffer);
 196         exit(EXIT_FAILURE);
 197 }
 198
 199 /*
 200  * Skip the given character for maximum 'amount' times, returns
 201  * a pointer to the first non-'character' character in 'input'.
 202  *
 203  */
 204 static char *skip_character(char *input, char character, int amount) {
 205         char *walk;
 206         size_t len = strlen(input);
 207         int blanks = 0;
 208
 209         for (walk = input; ((size_t)(walk - input) < len) && (blanks < amount); walk++)
 210                 if (*walk == character)
 211                         blanks++;
 212
 213         return (walk == input ? walk : walk-1);
 214 }
 215
 216 /*
 217  * Get battery information from /sys. Note that it uses the design capacity to
 218  * calculate the percentage, not the last full capacity, so you can see how
 219  * worn off your battery is.
 220  *
 221  */
 222 static char *get_battery_info() {
 223         char buf[1024];
 224         static char part[512];
 225         char *walk, *last;
 226         int fd;
 227         int full_design = -1,
 228             remaining = -1,
 229             present_rate = -1;
 230         charging_status_t status = CS_DISCHARGING;
 231
 232         if ((fd = open(battery_path, O_RDONLY)) == -1)
 233                 return "No battery found";
 234
 235         memset(part, 0, sizeof(part));
 236         (void)read(fd, buf, sizeof(buf));
 237         for (walk = buf, last = buf; (walk-buf) < 1024; walk++)
 238                 if (*walk == '=') {
 239                         if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN") ||
 240                             BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN"))
 241                                 full_design = atoi(walk+1);
 242                         else if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW") ||
 243                                  BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW"))
 244                                 remaining = atoi(walk+1);
 245                         else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
 246                                 present_rate = atoi(walk+1);
 247                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
 248                                 status = CS_CHARGING;
 249                         else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
 250                                 status = CS_FULL;
 251                 } else if (*walk == '\n')
 252                         last = walk+1;
 253         (void)close(fd);
 254
 255         if ((full_design != -1) && (remaining != -1) && (present_rate != -1)) {
 256                 float remaining_time, perc;
 257                 int seconds, hours, minutes;
 258                 if (status == CS_CHARGING)
 259                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
 260                 else if (status == CS_DISCHARGING)
 261                         remaining_time = ((float)remaining / (float)present_rate);
 262                 else {
 263                         (void)snprintf(part, sizeof(part), "FULL");
 264                         return part;
 265                 }
 266                 perc = ((float)remaining / (float)full_design);
 267
 268                 seconds = (int)(remaining_time * 3600.0);
 269                 hours = seconds / 3600;
 270                 seconds -= (hours * 3600);
 271                 minutes = seconds / 60;
 272                 seconds -= (minutes * 60);
 273
 274                 (void)snprintf(part, sizeof(part), "%s %.02f%% %02d:%02d:%02d",
 275                         (status == CS_CHARGING? "CHR" : "BAT"),
 276                         (perc * 100), hours, minutes, seconds);
 277         }
 278         return part;
 279 }
 280
 281 /*
 282  * Just parses /proc/net/wireless
 283  *
 284  */
 285 static char *get_wireless_info() {
 286         char buf[1024];
 287         static char part[512];
 288         char *interfaces;
 289         int fd;
 290         memset(buf, 0, sizeof(buf));
 291         memset(part, 0, sizeof(part));
 292
 293         if ((fd = open("/proc/net/wireless", O_RDONLY)) == -1)
 294                 die("Could not open /proc/net/wireless");
 295         (void)read(fd, buf, sizeof(buf));
 296         (void)close(fd);
 297
 298         interfaces = skip_character(buf, '\n', 2) + 1;
 299         while (interfaces < buf+strlen(buf)) {
 300                 while (isspace((int)*interfaces))
 301                         interfaces++;
 302                 if (strncmp(interfaces, wlan_interface, strlen(wlan_interface)) == 0) {
 303                         int quality;
 304                         /* Skip status field (0000) */
 305                         interfaces += strlen(wlan_interface) + 2;
 306                         interfaces = skip_character(interfaces, ' ', 1);
 307                         while (isspace((int)*interfaces))
 308                                 interfaces++;
 309                         quality = atoi(interfaces);
 310                         /* For some reason, I get 255 sometimes */
 311                         if ((quality == 255) || (quality == 0)) {
 312                         if (use_colors)
 313                                 (void)snprintf(part, sizeof(part), "%s%s", concat("#FF0000 ", wmii_normcolors), " W: down");
 314                         else (void)snprintf(part, sizeof(part), "W: down");
 315
 316                         } else {
 317                                 const char *ip_address;
 318                                 (void)snprintf(part, sizeof(part), "W: (%03d%%) ", quality);
 319                                 ip_address = get_ip_address(wlan_interface);
 320                                 strcpy(part+strlen(part), ip_address);
 321                         }
 322
 323                         return part;
 324                 }
 325                 interfaces = skip_character(interfaces, '\n', 1) + 1;
 326         }
 327
 328         return part;
 329 }
 330
 331 /*
 332  * Return the IP address for the given interface or "no IP" if the
 333  * interface is up and running but hasn't got an IP address yet
 334  *
 335  */
 336 static const char *get_ip_address(const char *interface) {
 337         static char part[512];
 338         struct ifreq ifr;
 339         int fd;
 340         memset(part, 0, sizeof(part));
 341
 342         if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
 343                 die("Could not create socket");
 344
 345         strcpy(ifr.ifr_name, interface);
 346         if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0)
 347                 die("Could not get interface flags (SIOCGIFFLAGS)");
 348
 349         if (!(ifr.ifr_flags & IFF_UP) ||
 350             !(ifr.ifr_flags & IFF_RUNNING)) {
 351                 close(fd);
 352                 return NULL;
 353         }
 354
 355         (void)strcpy(ifr.ifr_name, interface);
 356         ifr.ifr_addr.sa_family = AF_INET;
 357         if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
 358                 struct sockaddr_in addr;
 359                 memcpy(&addr, &ifr.ifr_addr, sizeof(struct sockaddr_in));
 360                 (void)inet_ntop(AF_INET, &addr.sin_addr.s_addr, part, (socklen_t)sizeof(struct sockaddr_in));
 361                 if (strlen(part) == 0)
 362                         snprintf(part, sizeof(part), "no IP");
 363         }
 364
 365         (void)close(fd);
 366         return part;
 367 }
 368
 369 /*
 370  * Combines ethernet IP addresses and speed (if requested) for displaying
 371  *
 372  */
 373 static char *get_eth_info() {
 374         static char part[512];
 375         const char *ip_address = get_ip_address(eth_interface);
 376         int ethspeed = 0;
 377
 378         if (get_ethspeed) {
 379                 /* This code path requires root privileges */
 380                 struct ifreq ifr;
 381                 struct ethtool_cmd ecmd;
 382                 int fd, err;
 383
 384                 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 385                         write_error_to_statusbar("Could not open socket");
 386
 387                 ecmd.cmd = ETHTOOL_GSET;
 388                 (void)memset(&ifr, 0, sizeof(ifr));
 389                 ifr.ifr_data = (caddr_t)&ecmd;
 390                 (void)strcpy(ifr.ifr_name, eth_interface);
 391                 if ((err = ioctl(fd, SIOCETHTOOL, &ifr)) == 0)
 392                         ethspeed = (ecmd.speed == 65535 ? 0 : ecmd.speed);
 393                 else get_ethspeed = false;
 394
 395                 (void)close(fd);
 396         }
 397
 398         if (ip_address == NULL)
 399                 (void)snprintf(part, sizeof(part), "E: down");
 400         else {
 401                 if (get_ethspeed)
 402                         (void)snprintf(part, sizeof(part), "E: %s (%d Mbit/s)", ip_address, ethspeed);
 403                 else (void)snprintf(part, sizeof(part), "E: %s", ip_address);
 404         }
 405
 406         return part;
 407 }
 408
 409 /*
 410  * Checks if the PID in path is still valid by checking if /proc/<pid> exists
 411  *
 412  */
 413 static bool process_runs(const char *path) {
 414         char pidbuf[512],
 415              procbuf[512],
 416              *walk;
 417         ssize_t n;
 418         static glob_t globbuf;
 419         struct stat statbuf;
 420         const char *real_path;
 421         int fd;
 422
 423         if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
 424                 die("glob() failed");
 425         real_path = (globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : path);
 426         fd = open(real_path, O_RDONLY);
 427         globfree(&globbuf);
 428         if (fd < 0)
 429                 return false;
 430         if ((n = read(fd, pidbuf, sizeof(pidbuf))) > 0)
 431                 pidbuf[n] = '\0';
 432         (void)close(fd);
 433         for (walk = pidbuf; *walk != '\0'; walk++)
 434                 if (!isdigit((int)(*walk))) {
 435                         *walk = '\0';
 436                         break;
 437                 }
 438         (void)snprintf(procbuf, sizeof(procbuf), "/proc/%s", pidbuf);
 439         return (stat(procbuf, &statbuf) >= 0);
 440 }
 441
 442 int main(int argc, char *argv[]) {
 443         char part[512],
 444              pathbuf[512],
 445              *end;
 446         unsigned int i;
 447         int load_avg;
 448
 449         char *configfile = PREFIX "/etc/wmiistatus.conf";
 450         int o, option_index = 0;
 451         struct option long_options[] = {
 452                 {"config", required_argument, 0, 'c'},
 453                 {0, 0, 0, 0}
 454         };
 455
 456         while ((o = getopt_long(argc, argv, "c:", long_options, &option_index)) != -1)
 457                 if ((char)o == 'c')
 458                         configfile = optarg;
 459
 460         if (load_configuration(configfile) < 0)
 461                 return EXIT_FAILURE;
 462
 463         setup();
 464
 465         while (1) {
 466                 for (i = 0; i < num_run_watches; i += 2) {
 467                         bool running = process_runs(run_watches[i+1]);
 468                         if (use_colors)
 469                                 snprintf(part, sizeof(part), "%s %s: %s",
 470                                         (running ?
 471                                                 concat("#00FF00 ", wmii_normcolors) :
 472                                                 concat("#FF0000 ", wmii_normcolors)),
 473                                         run_watches[i],
 474                                         (running ? "yes" : "no"));
 475                         else snprintf(part, sizeof(part), "%s: %s", run_watches[i], (running ? "yes" : "no"));
 476                         snprintf(pathbuf, sizeof(pathbuf), "%s%s", order[ORDER_RUN], run_watches[i]);
 477                         write_to_statusbar(pathbuf, part);
 478                 }
 479
 480                 if (wlan_interface)
 481                         write_to_statusbar(concat(order[ORDER_WLAN], "wlan"), get_wireless_info());
 482                 if (eth_interface)
 483                         write_to_statusbar(concat(order[ORDER_ETH], "eth"), get_eth_info());
 484                 if (battery_path)
 485                         write_to_statusbar(concat(order[ORDER_BATTERY], "battery"), get_battery_info());
 486
 487                 /* Get load */
 488                 if ((load_avg = open("/proc/loadavg", O_RDONLY)) == -1)
 489                         die("Could not open /proc/loadavg");
 490                 (void)read(load_avg, part, sizeof(part));
 491                 (void)close(load_avg);
 492                 end = skip_character(part, ' ', 3);
 493                 *end = '\0';
 494                 write_to_statusbar(concat(order[ORDER_LOAD], "load"), part);
 495
 496                 if (time_format) {
 497                         /* Get date & time */
 498                         time_t current_time = time(NULL);
 499                         struct tm *current_tm = localtime(&current_time);
 500                         (void)strftime(part, sizeof(part), time_format, current_tm);
 501                         write_to_statusbar(concat(order[ORDER_TIME], "time"), part);
 502                 }
 503
 504                 sleep(interval);
 505         }
 506 }