src/xutils.c

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2009, 2010 Daniel Borkmann.
   5  * Copyright 2009, 2010 Emmanuel Roullit.
   6  * Copyright 2010 Marek Polacek.
   7  * Subject to the GPL, version 2.
   8  */
   9
  10 #define _GNU_SOURCE
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <stdint.h>
  14 #include <fcntl.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <errno.h>
  18 #include <stdarg.h>
  19 #include <ctype.h>
  20 #include <signal.h>
  21 #include <arpa/inet.h>
  22 #include <time.h>
  23 #include <sched.h>
  24 #include <limits.h>
  25 #include <stdbool.h>
  26 #include <netdb.h>
  27 #include <ifaddrs.h>
  28 #include <sys/time.h>
  29 #include <sys/socket.h>
  30 #include <sys/ioctl.h>
  31 #include <sys/resource.h>
  32 #include <sys/epoll.h>
  33 #include <sys/syscall.h>
  34 #include <asm/unistd.h>
  35 /* Kernel < 2.6.26 */
  36 #include <linux/if.h>
  37 #include <linux/socket.h>
  38 #include <linux/types.h>
  39 /* Kernel < 2.6.26 */
  40 #include <linux/if_ether.h>
  41 #include <linux/if_packet.h>
  42 #include <linux/sockios.h>
  43 #include <netinet/tcp.h>
  44 #include <netinet/udp.h>
  45
  46 #include "die.h"
  47 #include "xutils.h"
  48 #include "ring.h"
  49 #include "tprintf.h"
  50 #include "built_in.h"
  51
  52 #define IOPRIO_CLASS_SHIFT      13
  53
  54 enum {
  55         ioprio_class_none,
  56         ioprio_class_rt,
  57         ioprio_class_be,
  58         ioprio_class_idle,
  59 };
  60
  61 enum {
  62         ioprio_who_process = 1,
  63         ioprio_who_pgrp,
  64         ioprio_who_user,
  65 };
  66
  67 static const char *const to_prio[] = {
  68         "none", "realtime", "best-effort", "idle",
  69 };
  70
  71 static const char *const sock_mem[] = {
  72         "/proc/sys/net/core/rmem_max",
  73         "/proc/sys/net/core/rmem_default",
  74         "/proc/sys/net/core/wmem_max",
  75         "/proc/sys/net/core/wmem_default",
  76 };
  77
  78 int af_socket(int af)
  79 {
  80         int sock;
  81
  82         if (unlikely(af != AF_INET && af != AF_INET6)) {
  83                 whine("Wrong AF socket type! Falling back to AF_INET\n");
  84                 af = AF_INET;
  85         }
  86
  87         sock = socket(af, SOCK_DGRAM, 0);
  88         if (unlikely(sock < 0))
  89                 panic("Creation AF socket failed!\n");
  90
  91         return sock;
  92 }
  93
  94 int pf_socket(void)
  95 {
  96         int sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
  97         if (unlikely(sock < 0))
  98                 panic("Creation of PF socket failed!\n");
  99
 100         return sock;
 101 }
 102
 103 void set_sock_prio(int fd, int prio)
 104 {
 105         int val = prio;
 106         setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &val, sizeof(val));
 107 }
 108
 109 void set_udp_cork(int fd)
 110 {
 111         int state = 1;
 112         setsockopt(fd, IPPROTO_UDP, UDP_CORK, &state, sizeof(state));
 113 }
 114
 115 void set_udp_uncork(int fd)
 116 {
 117         int state = 0;
 118         setsockopt(fd, IPPROTO_UDP, UDP_CORK, &state, sizeof(state));
 119 }
 120
 121 void set_tcp_cork(int fd)
 122 {
 123         int state = 1;
 124         setsockopt(fd, IPPROTO_TCP, TCP_CORK, &state, sizeof(state));
 125 }
 126
 127 void set_tcp_uncork(int fd)
 128 {
 129         int state = 0;
 130         setsockopt(fd, IPPROTO_TCP, TCP_CORK, &state, sizeof(state));
 131 }
 132
 133 void set_sock_cork(int fd, int udp)
 134 {
 135         if (!!udp)
 136                 set_udp_cork(fd);
 137         else
 138                 set_tcp_cork(fd);
 139 }
 140
 141 void set_sock_uncork(int fd, int udp)
 142 {
 143         if (!!udp)
 144                 set_udp_uncork(fd);
 145         else
 146                 set_tcp_uncork(fd);
 147 }
 148
 149 int set_nonblocking(int fd)
 150 {
 151         int ret = fcntl(fd, F_SETFL, fcntl(fd, F_GETFD, 0) | O_NONBLOCK);
 152         if (unlikely(ret < 0))
 153                 panic("Cannot fcntl!\n");
 154
 155         return 0;
 156 }
 157
 158 int set_nonblocking_sloppy(int fd)
 159 {
 160         return fcntl(fd, F_SETFL, fcntl(fd, F_GETFD, 0) | O_NONBLOCK);
 161 }
 162
 163 void set_socket_keepalive(int fd)
 164 {
 165         int one = 1;
 166         setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one));
 167 }
 168
 169 void set_tcp_nodelay(int fd)
 170 {
 171         int one = 1;
 172         setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
 173 }
 174
 175 int set_ipv6_only(int fd)
 176 {
 177         int one = 1;
 178         return setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
 179 }
 180
 181 int set_reuseaddr(int fd)
 182 {
 183         int ret, one = 1;
 184
 185         ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof (one));
 186         if (unlikely(ret < 0))
 187                 panic("Cannot reuse addr!\n");
 188
 189         return 0;
 190 }
 191
 192 void set_mtu_disc_dont(int fd)
 193 {
 194         int mtu = IP_PMTUDISC_DONT;
 195         setsockopt(fd, SOL_IP, IP_MTU_DISCOVER, &mtu, sizeof(mtu));
 196 }
 197
 198 void set_epoll_descriptor(int fd_epoll, int action, int fd_toadd, int events)
 199 {
 200         int ret;
 201         struct epoll_event ev;
 202
 203         memset(&ev, 0, sizeof(ev));
 204         ev.events = events;
 205         ev.data.fd = fd_toadd;
 206
 207         ret = epoll_ctl(fd_epoll, action, fd_toadd, &ev);
 208         if (ret < 0)
 209                 panic("Cannot add socket for epoll!\n");
 210 }
 211
 212 int set_epoll_descriptor2(int fd_epoll, int action, int fd_toadd, int events)
 213 {
 214         struct epoll_event ev;
 215
 216         memset(&ev, 0, sizeof(ev));
 217         ev.events = events;
 218         ev.data.fd = fd_toadd;
 219
 220         return epoll_ctl(fd_epoll, action, fd_toadd, &ev);
 221 }
 222
 223 int wireless_bitrate(const char *ifname)
 224 {
 225         int sock, ret, rate_in_mbit;
 226         struct iwreq iwr;
 227
 228         sock = af_socket(AF_INET);
 229
 230         memset(&iwr, 0, sizeof(iwr));
 231         strlcpy(iwr.ifr_name, ifname, IFNAMSIZ);
 232
 233         ret = ioctl(sock, SIOCGIWRATE, &iwr);
 234         if (!ret)
 235                 rate_in_mbit = iwr.u.bitrate.value / 1000000;
 236         else
 237                 rate_in_mbit = 0;
 238
 239         close(sock);
 240
 241         return rate_in_mbit;
 242 }
 243
 244 int adjust_dbm_level(int in_dbm, int dbm_val)
 245 {
 246         if (!in_dbm)
 247                 return dbm_val;
 248
 249         return dbm_val - 0x100;
 250 }
 251
 252 int get_system_socket_mem(int which)
 253 {
 254         int fd, val = -1;
 255         ssize_t ret;
 256         const char *file = sock_mem[which];
 257         char buff[64];
 258
 259         fd = open(file, O_RDONLY);
 260         if (fd < 0)
 261                 return val;
 262
 263         ret = read(fd, buff, sizeof(buff));
 264         if (ret > 0)
 265                 val = atoi(buff);
 266
 267         close(fd);
 268         return val;
 269 }
 270
 271 void set_system_socket_mem(int which, int val)
 272 {
 273         int fd;
 274         const char *file = sock_mem[which];
 275         ssize_t ret;
 276         char buff[64];
 277
 278         fd = open(file, O_WRONLY);
 279         if (fd < 0)
 280                 return;
 281
 282         memset(buff, 0, sizeof(buff));
 283         slprintf(buff, sizeof(buff), "%d", val);
 284
 285         ret = write(fd, buff, strlen(buff));
 286         ret = ret;
 287
 288         close(fd);
 289 }
 290
 291 int wireless_sigqual(const char *ifname, struct iw_statistics *stats)
 292 {
 293         int ret, sock;
 294         struct iwreq iwr;
 295
 296         sock = af_socket(AF_INET);
 297
 298         memset(&iwr, 0, sizeof(iwr));
 299         strlcpy(iwr.ifr_name, ifname, IFNAMSIZ);
 300
 301         iwr.u.data.pointer = (caddr_t) stats;
 302         iwr.u.data.length = sizeof(*stats);
 303         iwr.u.data.flags = 1;
 304
 305         ret = ioctl(sock, SIOCGIWSTATS, &iwr);
 306
 307         close(sock);
 308
 309         return ret;
 310 }
 311
 312 int wireless_rangemax_sigqual(const char *ifname)
 313 {
 314         int ret, sock, sigqual;
 315         struct iwreq iwr;
 316         struct iw_range iwrange;
 317
 318         sock = af_socket(AF_INET);
 319
 320         memset(&iwrange, 0, sizeof(iwrange));
 321
 322         memset(&iwr, 0, sizeof(iwr));
 323         strlcpy(iwr.ifr_name, ifname, IFNAMSIZ);
 324
 325         iwr.u.data.pointer = (caddr_t) &iwrange;
 326         iwr.u.data.length = sizeof(iwrange);
 327         iwr.u.data.flags = 0;
 328
 329         ret = ioctl(sock, SIOCGIWRANGE, &iwr);
 330         if (!ret)
 331                 sigqual = iwrange.max_qual.qual;
 332         else
 333                 sigqual = 0;
 334
 335         close(sock);
 336
 337         return sigqual;
 338 }
 339
 340 int ethtool_bitrate(const char *ifname)
 341 {
 342         int ret, sock, bitrate;
 343         struct ifreq ifr;
 344         struct ethtool_cmd ecmd;
 345
 346         sock = af_socket(AF_INET);
 347
 348         memset(&ecmd, 0, sizeof(ecmd));
 349
 350         memset(&ifr, 0, sizeof(ifr));
 351         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 352
 353         ecmd.cmd = ETHTOOL_GSET;
 354         ifr.ifr_data = (char *) &ecmd;
 355
 356         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 357         if (ret) {
 358                 bitrate = 0;
 359                 goto out;
 360         }
 361
 362         switch (ecmd.speed) {
 363         case SPEED_10:
 364         case SPEED_100:
 365         case SPEED_1000:
 366         case SPEED_10000:
 367                 bitrate = ecmd.speed;
 368                 break;
 369         default:
 370                 bitrate = 0;
 371                 break;
 372         };
 373 out:
 374         close(sock);
 375
 376         return bitrate;
 377 }
 378
 379 int ethtool_drvinf(const char *ifname, struct ethtool_drvinfo *drvinf)
 380 {
 381         int ret, sock;
 382         struct ifreq ifr;
 383
 384         sock = af_socket(AF_INET);
 385
 386         memset(drvinf, 0, sizeof(*drvinf));
 387
 388         memset(&ifr, 0, sizeof(ifr));
 389         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 390
 391         drvinf->cmd = ETHTOOL_GDRVINFO;
 392         ifr.ifr_data = (char *) drvinf;
 393
 394         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 395
 396         close(sock);
 397
 398         return ret;
 399 }
 400
 401 int device_bitrate(const char *ifname)
 402 {
 403         int speed_c, speed_w;
 404
 405         speed_c = ethtool_bitrate(ifname);
 406         speed_w = wireless_bitrate(ifname);
 407
 408         return (speed_c == 0 ? speed_w : speed_c);
 409 }
 410
 411 int device_ifindex(const char *ifname)
 412 {
 413         int ret, sock, index;
 414         struct ifreq ifr;
 415
 416         if (!strncmp("any", ifname, strlen("any")))
 417                 return 0;
 418
 419         sock = af_socket(AF_INET);
 420
 421         memset(&ifr, 0, sizeof(ifr));
 422         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 423
 424         ret = ioctl(sock, SIOCGIFINDEX, &ifr);
 425         if (!ret)
 426                 index = ifr.ifr_ifindex;
 427         else
 428                 index = -1;
 429
 430         close(sock);
 431
 432         return index;
 433 }
 434
 435 static int __device_address6(const char *ifname, struct sockaddr_storage *ss)
 436 {
 437         int ret, family, found = -EINVAL;
 438         struct ifaddrs *ifaddr, *ifa;
 439
 440         ret = getifaddrs(&ifaddr);
 441         if (ret < 0)
 442                 panic("Cannot get device addresses for IPv6!\n");
 443
 444         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 445                 family = ifa->ifa_addr->sa_family;
 446                 if (family != AF_INET6)
 447                         continue;
 448                 if (strcmp(ifa->ifa_name, ifname))
 449                         continue;
 450
 451                 memcpy(ss, ifa->ifa_addr, sizeof(*ss));
 452                 found = 0;
 453                 break;
 454         }
 455
 456         freeifaddrs(ifaddr);
 457         return found;
 458 }
 459
 460 int device_address(const char *ifname, int af, struct sockaddr_storage *ss)
 461 {
 462         int ret, sock;
 463         struct ifreq ifr;
 464
 465         if (!ss)
 466                 return -EINVAL;
 467         if (!strncmp("any", ifname, strlen("any")))
 468                 return -EINVAL;
 469         if (af == AF_INET6)
 470                 return __device_address6(ifname, ss);
 471
 472         sock = af_socket(af);
 473
 474         memset(&ifr, 0, sizeof(ifr));
 475         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 476
 477         ifr.ifr_addr.sa_family = af;
 478
 479         ret = ioctl(sock, SIOCGIFADDR, &ifr);
 480         if (!ret)
 481                 memcpy(ss, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
 482
 483         close(sock);
 484
 485         return ret;
 486 }
 487
 488 int device_mtu(const char *ifname)
 489 {
 490         int ret, sock, mtu;
 491         struct ifreq ifr;
 492
 493         sock = af_socket(AF_INET);
 494
 495         memset(&ifr, 0, sizeof(ifr));
 496         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 497
 498         ret = ioctl(sock, SIOCGIFMTU, &ifr);
 499         if (!ret)
 500                 mtu = ifr.ifr_mtu;
 501         else
 502                 mtu = 0;
 503
 504         close(sock);
 505
 506         return mtu;
 507 }
 508
 509 short device_get_flags(const char *ifname)
 510 {
 511         /* Really, it's short! Look at struct ifreq */
 512         short flags;
 513         int ret, sock;
 514         struct ifreq ifr;
 515
 516         sock = af_socket(AF_INET);
 517
 518         memset(&ifr, 0, sizeof(ifr));
 519         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 520
 521         ret = ioctl(sock, SIOCGIFFLAGS, &ifr);
 522         if (!ret)
 523                 flags = ifr.ifr_flags;
 524         else
 525                 flags = 0;
 526
 527         close(sock);
 528
 529         return flags;
 530 }
 531
 532 void device_set_flags(const char *ifname, const short flags)
 533 {
 534         int ret, sock;
 535         struct ifreq ifr;
 536
 537         sock = af_socket(AF_INET);
 538
 539         memset(&ifr, 0, sizeof(ifr));
 540         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 541
 542         ifr.ifr_flags = flags;
 543
 544         ret = ioctl(sock, SIOCSIFFLAGS, &ifr);
 545         if (ret < 0)
 546                 panic("Cannot set NIC flags!\n");
 547
 548         close(sock);
 549 }
 550
 551 int device_irq_number(const char *ifname)
 552 {
 553         /*
 554          * Since fetching IRQ numbers from SIOCGIFMAP is deprecated and not
 555          * supported anymore, we need to grab them from procfs
 556          */
 557         int irq = 0;
 558         char *buffp;
 559         char buff[512];
 560         char sysname[512];
 561         FILE *fp;
 562
 563         if (!strncmp("lo", ifname, strlen("lo")))
 564                 return 0;
 565
 566         fp = fopen("/proc/interrupts", "r");
 567         if (!fp) {
 568                 whine("Cannot open /proc/interrupts!\n");
 569                 return -ENOENT;
 570         }
 571
 572         memset(buff, 0, sizeof(buff));
 573         while (fgets(buff, sizeof(buff), fp) != NULL) {
 574                 buff[sizeof(buff) - 1] = 0;
 575
 576                 if (strstr(buff, ifname) == NULL)
 577                         continue;
 578
 579                 buffp = buff;
 580                 while (*buffp != ':')
 581                         buffp++;
 582                 *buffp = 0;
 583                 irq = atoi(buff);
 584
 585                 memset(buff, 0, sizeof(buff));
 586         }
 587
 588         fclose(fp);
 589
 590         if (irq != 0)
 591                 return irq;
 592         /*
 593          * Try sysfs as fallback. Probably wireless devices will be found
 594          * here. We return silently if it fails ...
 595          */
 596         slprintf(sysname, sizeof(sysname), "/sys/class/net/%s/device/irq",
 597                  ifname);
 598
 599         fp = fopen(sysname, "r");
 600         if (!fp)
 601                 return -ENOENT;
 602
 603         memset(buff, 0, sizeof(buff));
 604         if(fgets(buff, sizeof(buff), fp) != NULL) {
 605                 buff[sizeof(buff) - 1] = 0;
 606                 irq = atoi(buff);
 607         }
 608
 609         fclose(fp);
 610
 611         return irq;
 612 }
 613
 614 int device_bind_irq_to_cpu(int irq, int cpu)
 615 {
 616         int ret;
 617         char buff[256];
 618         char file[256];
 619         FILE *fp;
 620
 621         /* Note: first CPU begins with CPU 0 */
 622         if (irq < 0 || cpu < 0)
 623                 return -EINVAL;
 624
 625         memset(file, 0, sizeof(file));
 626         memset(buff, 0, sizeof(buff));
 627
 628         /* smp_affinity starts counting with CPU 1, 2, ... */
 629         cpu = cpu + 1;
 630         sprintf(file, "/proc/irq/%d/smp_affinity", irq);
 631
 632         fp = fopen(file, "w");
 633         if (!fp) {
 634                 whine("Cannot open file %s!\n", file);
 635                 return -ENOENT;
 636         }
 637
 638         sprintf(buff, "%d", cpu);
 639         ret = fwrite(buff, sizeof(buff), 1, fp);
 640
 641         fclose(fp);
 642         return (ret > 0 ? 0 : ret);
 643 }
 644
 645 void sock_print_net_stats(int sock, unsigned long skipped)
 646 {
 647         int ret;
 648         struct tpacket_stats kstats;
 649
 650         socklen_t slen = sizeof(kstats);
 651
 652         memset(&kstats, 0, sizeof(kstats));
 653
 654         ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
 655         if (ret > -1) {
 656                 printf("\r%12ld  frames incoming\n",
 657                        1UL * kstats.tp_packets);
 658                 printf("\r%12ld  frames passed filter\n",
 659                        1UL * kstats.tp_packets - kstats.tp_drops - skipped);
 660                 printf("\r%12ld  frames failed filter (out of space)\n",
 661                        1UL * kstats.tp_drops + skipped);
 662                 if (kstats.tp_packets > 0)
 663                         printf("\r%12.4f%% frame droprate\n", 1.f *
 664                                kstats.tp_drops / kstats.tp_packets * 100.f);
 665         }
 666 }
 667
 668 void register_signal(int signal, void (*handler)(int))
 669 {
 670         sigset_t block_mask;
 671         struct sigaction saction;
 672
 673         sigfillset(&block_mask);
 674
 675         saction.sa_handler = handler;
 676         saction.sa_mask = block_mask;
 677         saction.sa_flags = SA_RESTART;
 678         sigaction(signal, &saction, NULL);
 679 }
 680
 681 void register_signal_f(int signal, void (*handler)(int), int flags)
 682 {
 683         sigset_t block_mask;
 684         struct sigaction saction;
 685
 686         sigfillset(&block_mask);
 687
 688         saction.sa_handler = handler;
 689         saction.sa_mask = block_mask;
 690         saction.sa_flags = flags;
 691         sigaction(signal, &saction, NULL);
 692 }
 693
 694 int get_tty_size(void)
 695 {
 696 #ifdef TIOCGSIZE
 697         struct ttysize ts = {0};
 698         return (ioctl(0, TIOCGSIZE, &ts) == 0 ?
 699                 ts.ts_cols : DEFAULT_TTY_SIZE);
 700 #elif defined(TIOCGWINSZ)
 701         struct winsize ts;
 702         return (ioctl(0, TIOCGWINSZ, &ts) == 0 ?
 703                 ts.ws_col : DEFAULT_TTY_SIZE);
 704 #else
 705         return DEFAULT_TTY_SIZE;
 706 #endif
 707 }
 708
 709 short enter_promiscuous_mode(char *ifname)
 710 {
 711         short ifflags;
 712
 713         if (!strncmp("any", ifname, strlen("any")))
 714                 return 0;
 715
 716         ifflags = device_get_flags(ifname);
 717         device_set_flags(ifname, ifflags | IFF_PROMISC);
 718
 719         return ifflags;
 720 }
 721
 722 void leave_promiscuous_mode(char *ifname, short oldflags)
 723 {
 724         if (!strncmp("any", ifname, strlen("any")))
 725                 return;
 726
 727         device_set_flags(ifname, oldflags);
 728 }
 729
 730 int device_up(char *ifname)
 731 {
 732         if (!ifname)
 733                 return -EINVAL;
 734         if (!strncmp("any", ifname, strlen("any")))
 735                 return 1;
 736
 737         return (device_get_flags(ifname) & IFF_UP) == IFF_UP;
 738 }
 739
 740 int device_running(char *ifname)
 741 {
 742         if (!ifname)
 743                 return -EINVAL;
 744         if (!strncmp("any", ifname, strlen("any")))
 745                 return 1;
 746
 747         return (device_get_flags(ifname) & IFF_RUNNING) == IFF_RUNNING;
 748 }
 749
 750 int device_up_and_running(char *ifname)
 751 {
 752         if (!ifname)
 753                 return -EINVAL;
 754         if (!strncmp("any", ifname, strlen("any")))
 755                 return 1;
 756
 757         return (device_get_flags(ifname) & (IFF_UP | IFF_RUNNING)) ==
 758                (IFF_UP | IFF_RUNNING);
 759 }
 760
 761 int poll_error_maybe_die(int sock, struct pollfd *pfd)
 762 {
 763         if ((pfd->revents & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) == 0)
 764                 return POLL_NEXT_PKT;
 765         if (pfd->revents & (POLLHUP | POLLRDHUP))
 766                 panic("Hangup on socket occured!\n");
 767         if (pfd->revents & POLLERR) {
 768                 int tmp;
 769
 770                 errno = 0;
 771                 if (recv(sock, &tmp, sizeof(tmp), MSG_PEEK) >= 0)
 772                         return POLL_NEXT_PKT;
 773                 if (errno == ENETDOWN)
 774                         panic("Interface went down!\n");
 775
 776                 return POLL_MOVE_OUT;
 777         }
 778         if (pfd->revents & POLLNVAL) {
 779                 whine("Invalid polling request on socket!\n");
 780
 781                 return POLL_MOVE_OUT;
 782         }
 783
 784         return POLL_NEXT_PKT;
 785 }
 786
 787 static inline char *next_token(char *q, int sep)
 788 {
 789         if (q)
 790                 q = strchr(q, sep);
 791                 /*
 792                  * glibc defines this as a macro and gcc throws a false
 793                  * positive ``logical ‘&&’ with non-zero constant will
 794                  * always evaluate as true'' in older versions. See:
 795                  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36513
 796                  */
 797         if (q)
 798                 q++;
 799         return q;
 800 }
 801
 802 int set_cpu_affinity(char *str, int inverted)
 803 {
 804         int ret, i, cpus;
 805         char *p, *q;
 806         cpu_set_t cpu_bitmask;
 807
 808         q = str;
 809
 810         cpus = get_number_cpus();
 811
 812         CPU_ZERO(&cpu_bitmask);
 813
 814         for (i = 0; inverted && i < cpus; ++i)
 815                 CPU_SET(i, &cpu_bitmask);
 816
 817         while (p = q, q = next_token(q, ','), p) {
 818                 unsigned int a;  /* Beginning of range */
 819                 unsigned int b;  /* End of range */
 820                 unsigned int s;  /* Stride */
 821                 char *c1, *c2;
 822
 823                 if (sscanf(p, "%u", &a) < 1)
 824                         return -EINVAL;
 825
 826                 b = a;
 827                 s = 1;
 828
 829                 c1 = next_token(p, '-');
 830                 c2 = next_token(p, ',');
 831
 832                 if (c1 != NULL && (c2 == NULL || c1 < c2)) {
 833                         if (sscanf(c1, "%u", &b) < 1)
 834                                 return -EINVAL;
 835
 836                         c1 = next_token(c1, ':');
 837
 838                         if (c1 != NULL && (c2 == NULL || c1 < c2))
 839                                 if (sscanf(c1, "%u", &s) < 1)
 840                                         return -EINVAL;
 841                 }
 842
 843                 if (!(a <= b))
 844                         return -EINVAL;
 845
 846                 while (a <= b) {
 847                         if (inverted)
 848                                 CPU_CLR(a, &cpu_bitmask);
 849                         else
 850                                 CPU_SET(a, &cpu_bitmask);
 851                         a += s;
 852                 }
 853         }
 854
 855         ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
 856                                 &cpu_bitmask);
 857         if (ret)
 858                 panic("Can't set this cpu affinity!\n");
 859
 860         return 0;
 861 }
 862
 863 int set_proc_prio(int priority)
 864 {
 865         /*
 866          * setpriority() is clever, even if you put a nice value which
 867          * is out of range it corrects it to the closest valid nice value
 868          */
 869         int ret = setpriority(PRIO_PROCESS, getpid(), priority);
 870         if (ret)
 871                 panic("Can't set nice val to %i!\n", priority);
 872
 873         return 0;
 874 }
 875
 876 int set_sched_status(int policy, int priority)
 877 {
 878         int ret, min_prio, max_prio;
 879         struct sched_param sp;
 880
 881         max_prio = sched_get_priority_max(policy);
 882         min_prio = sched_get_priority_min(policy);
 883
 884         if (max_prio == -1 || min_prio == -1)
 885                 whine("Cannot determine scheduler prio limits!\n");
 886         else if (priority < min_prio)
 887                 priority = min_prio;
 888         else if (priority > max_prio)
 889                 priority = max_prio;
 890
 891         memset(&sp, 0, sizeof(sp));
 892         sp.sched_priority = priority;
 893
 894         ret = sched_setscheduler(getpid(), policy, &sp);
 895         if (ret) {
 896                 whine("Cannot set scheduler policy!\n");
 897                 return -EINVAL;
 898         }
 899
 900         ret = sched_setparam(getpid(), &sp);
 901         if (ret) {
 902                 whine("Cannot set scheduler prio!\n");
 903                 return -EINVAL;
 904         }
 905
 906         return 0;
 907 }
 908
 909 static inline int ioprio_set(int which, int who, int ioprio)
 910 {
 911         return syscall(SYS_ioprio_set, which, who, ioprio);
 912 }
 913
 914 static inline int ioprio_get(int which, int who)
 915 {
 916         return syscall(SYS_ioprio_get, which, who);
 917 }
 918
 919 static void ioprio_setpid(pid_t pid, int ioprio, int ioclass)
 920 {
 921         int ret = ioprio_set(ioprio_who_process, pid,
 922                              ioprio | ioclass << IOPRIO_CLASS_SHIFT);
 923         if (ret < 0)
 924                 panic("Failed to set io prio for pid!\n");
 925 }
 926
 927 void ioprio_print(void)
 928 {
 929         int ioprio = ioprio_get(ioprio_who_process, getpid());
 930         if (ioprio < 0)
 931                 panic("Failed to fetch io prio for pid!\n");
 932         else {
 933                 int ioclass = ioprio >> IOPRIO_CLASS_SHIFT;
 934                 if (ioclass != ioprio_class_idle) {
 935                         ioprio &= 0xff;
 936                         printf("%s: prio %d\n", to_prio[ioclass], ioprio);
 937                 } else
 938                         printf("%s\n", to_prio[ioclass]);
 939         }
 940 }
 941
 942 void set_ioprio_rt(void)
 943 {
 944         ioprio_setpid(getpid(), 4, ioprio_class_rt);
 945 }
 946
 947 void set_ioprio_be(void)
 948 {
 949         ioprio_setpid(getpid(), 4, ioprio_class_be);
 950 }
 951
 952 int set_timeout(struct timeval *timeval, unsigned int msec)
 953 {
 954         if (msec == 0)
 955                 return -EINVAL;
 956
 957         timeval->tv_sec = 0;
 958         timeval->tv_usec = 0;
 959
 960         if (msec < 1000) {
 961                 timeval->tv_usec = msec * 1000;
 962                 return 0;
 963         }
 964
 965         timeval->tv_sec = (long) (msec / 1000);
 966         timeval->tv_usec = (long) ((msec - (timeval->tv_sec * 1000)) * 1000);
 967
 968         return 0;
 969 }
 970
 971 size_t strlcpy(char *dest, const char *src, size_t size)
 972 {
 973         size_t ret = strlen(src);
 974
 975         if (size) {
 976                 size_t len = (ret >= size) ? size - 1 : ret;
 977
 978                 memcpy(dest, src, len);
 979                 dest[len] = '\0';
 980         }
 981
 982         return ret;
 983 }
 984
 985 int slprintf(char *dst, size_t size, const char *fmt, ...)
 986 {
 987         int ret;
 988         va_list ap;
 989
 990         va_start(ap, fmt);
 991
 992         ret = vsnprintf(dst, size, fmt, ap);
 993         dst[size - 1] = '\0';
 994
 995         va_end(ap);
 996
 997         return ret;
 998 }
 999
1000 noinline void *xmemset(void *s, int c, size_t n)
1001 {
1002         size_t i;
1003         uint8_t *ptr = s;
1004
1005         for (i = 0; i < n; ++i)
1006                 ptr[i] = (uint8_t) c;
1007
1008         return ptr;
1009 }
1010
1011 char *getuint(char *in, uint32_t *out)
1012 {
1013         char *pt = in, tmp;
1014         char *endptr = NULL;
1015
1016         while (*in && (isdigit(*in) || isxdigit(*in) || *in == 'x'))
1017                 in++;
1018         if (!*in)
1019                 panic("Syntax error!\n");
1020         errno = 0;
1021         tmp = *in;
1022         *in = 0;
1023         *out = strtoul(pt, &endptr, 0);
1024         if ((endptr != NULL && *endptr != '\0') || errno != 0) {
1025                 panic("Syntax error!\n");
1026         }
1027         *in = tmp;
1028
1029         return in;
1030 }
1031
1032 char *strtrim_right(register char *p, register char c)
1033 {
1034         register char *end;
1035         register int len;
1036
1037         len = strlen(p);
1038         while (*p && len) {
1039                 end = p + len - 1;
1040                 if (c == *end)
1041                         *end = 0;
1042                 else
1043                         break;
1044                 len = strlen(p);
1045         }
1046
1047         return p;
1048 }
1049
1050 char *strtrim_left(register char *p, register char c)
1051 {
1052         register int len;
1053
1054         len = strlen(p);
1055         while (*p && len--) {
1056                 if (c == *p)
1057                         p++;
1058                 else
1059                         break;
1060         }
1061
1062         return p;
1063 }