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         ssize_t ret;
 275         const char *file = sock_mem[which];
 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
 287         close(fd);
 288 }
 289
 290 int wireless_sigqual(const char *ifname, struct iw_statistics *stats)
 291 {
 292         int ret, sock;
 293         struct iwreq iwr;
 294
 295         sock = af_socket(AF_INET);
 296
 297         memset(&iwr, 0, sizeof(iwr));
 298         strlcpy(iwr.ifr_name, ifname, IFNAMSIZ);
 299
 300         iwr.u.data.pointer = (caddr_t) stats;
 301         iwr.u.data.length = sizeof(*stats);
 302         iwr.u.data.flags = 1;
 303
 304         ret = ioctl(sock, SIOCGIWSTATS, &iwr);
 305
 306         close(sock);
 307
 308         return ret;
 309 }
 310
 311 int wireless_rangemax_sigqual(const char *ifname)
 312 {
 313         int ret, sock, sigqual;
 314         struct iwreq iwr;
 315         struct iw_range iwrange;
 316
 317         sock = af_socket(AF_INET);
 318
 319         memset(&iwrange, 0, sizeof(iwrange));
 320
 321         memset(&iwr, 0, sizeof(iwr));
 322         strlcpy(iwr.ifr_name, ifname, IFNAMSIZ);
 323
 324         iwr.u.data.pointer = (caddr_t) &iwrange;
 325         iwr.u.data.length = sizeof(iwrange);
 326         iwr.u.data.flags = 0;
 327
 328         ret = ioctl(sock, SIOCGIWRANGE, &iwr);
 329         if (!ret)
 330                 sigqual = iwrange.max_qual.qual;
 331         else
 332                 sigqual = 0;
 333
 334         close(sock);
 335
 336         return sigqual;
 337 }
 338
 339 int ethtool_bitrate(const char *ifname)
 340 {
 341         int ret, sock, bitrate;
 342         struct ifreq ifr;
 343         struct ethtool_cmd ecmd;
 344
 345         sock = af_socket(AF_INET);
 346
 347         memset(&ecmd, 0, sizeof(ecmd));
 348
 349         memset(&ifr, 0, sizeof(ifr));
 350         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 351
 352         ecmd.cmd = ETHTOOL_GSET;
 353         ifr.ifr_data = (char *) &ecmd;
 354
 355         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 356         if (ret) {
 357                 bitrate = 0;
 358                 goto out;
 359         }
 360
 361         switch (ecmd.speed) {
 362         case SPEED_10:
 363         case SPEED_100:
 364         case SPEED_1000:
 365         case SPEED_10000:
 366                 bitrate = ecmd.speed;
 367                 break;
 368         default:
 369                 bitrate = 0;
 370                 break;
 371         };
 372 out:
 373         close(sock);
 374
 375         return bitrate;
 376 }
 377
 378 int ethtool_drvinf(const char *ifname, struct ethtool_drvinfo *drvinf)
 379 {
 380         int ret, sock;
 381         struct ifreq ifr;
 382
 383         sock = af_socket(AF_INET);
 384
 385         memset(drvinf, 0, sizeof(*drvinf));
 386
 387         memset(&ifr, 0, sizeof(ifr));
 388         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 389
 390         drvinf->cmd = ETHTOOL_GDRVINFO;
 391         ifr.ifr_data = (char *) drvinf;
 392
 393         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 394
 395         close(sock);
 396
 397         return ret;
 398 }
 399
 400 int device_bitrate(const char *ifname)
 401 {
 402         int speed_c, speed_w;
 403
 404         speed_c = ethtool_bitrate(ifname);
 405         speed_w = wireless_bitrate(ifname);
 406
 407         return (speed_c == 0 ? speed_w : speed_c);
 408 }
 409
 410 int device_ifindex(const char *ifname)
 411 {
 412         int ret, sock, index;
 413         struct ifreq ifr;
 414
 415         if (!strncmp("any", ifname, strlen("any")))
 416                 return 0;
 417
 418         sock = af_socket(AF_INET);
 419
 420         memset(&ifr, 0, sizeof(ifr));
 421         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 422
 423         ret = ioctl(sock, SIOCGIFINDEX, &ifr);
 424         if (!ret)
 425                 index = ifr.ifr_ifindex;
 426         else
 427                 index = -1;
 428
 429         close(sock);
 430
 431         return index;
 432 }
 433
 434 static int __device_address6(const char *ifname, struct sockaddr_storage *ss)
 435 {
 436         int ret, family, found = -EINVAL;
 437         struct ifaddrs *ifaddr, *ifa;
 438
 439         ret = getifaddrs(&ifaddr);
 440         if (ret < 0)
 441                 panic("Cannot get device addresses for IPv6!\n");
 442
 443         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 444                 family = ifa->ifa_addr->sa_family;
 445                 if (family != AF_INET6)
 446                         continue;
 447                 if (strcmp(ifa->ifa_name, ifname))
 448                         continue;
 449
 450                 memcpy(ss, ifa->ifa_addr, sizeof(*ss));
 451                 found = 0;
 452                 break;
 453         }
 454
 455         freeifaddrs(ifaddr);
 456         return found;
 457 }
 458
 459 int device_address(const char *ifname, int af, struct sockaddr_storage *ss)
 460 {
 461         int ret, sock;
 462         struct ifreq ifr;
 463
 464         if (!ss)
 465                 return -EINVAL;
 466         if (!strncmp("any", ifname, strlen("any")))
 467                 return -EINVAL;
 468         if (af == AF_INET6)
 469                 return __device_address6(ifname, ss);
 470
 471         sock = af_socket(af);
 472
 473         memset(&ifr, 0, sizeof(ifr));
 474         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 475
 476         ifr.ifr_addr.sa_family = af;
 477
 478         ret = ioctl(sock, SIOCGIFADDR, &ifr);
 479         if (!ret)
 480                 memcpy(ss, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
 481
 482         close(sock);
 483
 484         return ret;
 485 }
 486
 487 int device_mtu(const char *ifname)
 488 {
 489         int ret, sock, mtu;
 490         struct ifreq ifr;
 491
 492         sock = af_socket(AF_INET);
 493
 494         memset(&ifr, 0, sizeof(ifr));
 495         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 496
 497         ret = ioctl(sock, SIOCGIFMTU, &ifr);
 498         if (!ret)
 499                 mtu = ifr.ifr_mtu;
 500         else
 501                 mtu = 0;
 502
 503         close(sock);
 504
 505         return mtu;
 506 }
 507
 508 short device_get_flags(const char *ifname)
 509 {
 510         /* Really, it's short! Look at struct ifreq */
 511         short flags;
 512         int ret, sock;
 513         struct ifreq ifr;
 514
 515         sock = af_socket(AF_INET);
 516
 517         memset(&ifr, 0, sizeof(ifr));
 518         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 519
 520         ret = ioctl(sock, SIOCGIFFLAGS, &ifr);
 521         if (!ret)
 522                 flags = ifr.ifr_flags;
 523         else
 524                 flags = 0;
 525
 526         close(sock);
 527
 528         return flags;
 529 }
 530
 531 void device_set_flags(const char *ifname, const short flags)
 532 {
 533         int ret, sock;
 534         struct ifreq ifr;
 535
 536         sock = af_socket(AF_INET);
 537
 538         memset(&ifr, 0, sizeof(ifr));
 539         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 540
 541         ifr.ifr_flags = flags;
 542
 543         ret = ioctl(sock, SIOCSIFFLAGS, &ifr);
 544         if (ret < 0)
 545                 panic("Cannot set NIC flags!\n");
 546
 547         close(sock);
 548 }
 549
 550 int device_irq_number(const char *ifname)
 551 {
 552         /*
 553          * Since fetching IRQ numbers from SIOCGIFMAP is deprecated and not
 554          * supported anymore, we need to grab them from procfs
 555          */
 556         int irq = 0;
 557         char *buffp;
 558         char buff[512];
 559         char sysname[512];
 560
 561         if (!strncmp("lo", ifname, strlen("lo")))
 562                 return 0;
 563
 564         FILE *fp = fopen("/proc/interrupts", "r");
 565         if (!fp) {
 566                 whine("Cannot open /proc/interrupts!\n");
 567                 return -ENOENT;
 568         }
 569
 570         memset(buff, 0, sizeof(buff));
 571         while (fgets(buff, sizeof(buff), fp) != NULL) {
 572                 buff[sizeof(buff) - 1] = 0;
 573
 574                 if (strstr(buff, ifname) == NULL)
 575                         continue;
 576
 577                 buffp = buff;
 578                 while (*buffp != ':')
 579                         buffp++;
 580                 *buffp = 0;
 581                 irq = atoi(buff);
 582
 583                 memset(buff, 0, sizeof(buff));
 584         }
 585
 586         fclose(fp);
 587
 588         if (irq != 0)
 589                 return irq;
 590         /*
 591          * Try sysfs as fallback. Probably wireless devices will be found
 592          * here. We return silently if it fails ...
 593          */
 594         slprintf(sysname, sizeof(sysname), "/sys/class/net/%s/device/irq",
 595                  ifname);
 596
 597         fp = fopen(sysname, "r");
 598         if (!fp)
 599                 return -ENOENT;
 600
 601         memset(buff, 0, sizeof(buff));
 602         if(fgets(buff, sizeof(buff), fp) != NULL) {
 603                 buff[sizeof(buff) - 1] = 0;
 604                 irq = atoi(buff);
 605         }
 606
 607         fclose(fp);
 608
 609         return irq;
 610 }
 611
 612 int device_bind_irq_to_cpu(int irq, int cpu)
 613 {
 614         int ret;
 615         char buff[256];
 616         char file[256];
 617
 618         /* Note: first CPU begins with CPU 0 */
 619         if (irq < 0 || cpu < 0)
 620                 return -EINVAL;
 621
 622         memset(file, 0, sizeof(file));
 623         memset(buff, 0, sizeof(buff));
 624
 625         /* smp_affinity starts counting with CPU 1, 2, ... */
 626         cpu = cpu + 1;
 627         sprintf(file, "/proc/irq/%d/smp_affinity", irq);
 628
 629         FILE *fp = fopen(file, "w");
 630         if (!fp) {
 631                 whine("Cannot open file %s!\n", file);
 632                 return -ENOENT;
 633         }
 634
 635         sprintf(buff, "%d", cpu);
 636         ret = fwrite(buff, sizeof(buff), 1, fp);
 637
 638         fclose(fp);
 639         return (ret > 0 ? 0 : ret);
 640 }
 641
 642 void sock_print_net_stats(int sock, unsigned long skipped)
 643 {
 644         int ret;
 645         struct tpacket_stats kstats;
 646
 647         socklen_t slen = sizeof(kstats);
 648
 649         memset(&kstats, 0, sizeof(kstats));
 650
 651         ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
 652         if (ret > -1) {
 653                 printf("\r%12ld  frames incoming\n",
 654                        1UL * kstats.tp_packets);
 655                 printf("\r%12ld  frames passed filter\n",
 656                        1UL * kstats.tp_packets - kstats.tp_drops - skipped);
 657                 printf("\r%12ld  frames failed filter (out of space)\n",
 658                        1UL * kstats.tp_drops + skipped);
 659                 if (kstats.tp_packets > 0)
 660                         printf("\r%12.4f%% frame droprate\n", 1.f *
 661                                kstats.tp_drops / kstats.tp_packets * 100.f);
 662         }
 663 }
 664
 665 void register_signal(int signal, void (*handler)(int))
 666 {
 667         sigset_t block_mask;
 668         struct sigaction saction;
 669
 670         sigfillset(&block_mask);
 671
 672         saction.sa_handler = handler;
 673         saction.sa_mask = block_mask;
 674         saction.sa_flags = SA_RESTART;
 675         sigaction(signal, &saction, NULL);
 676 }
 677
 678 void register_signal_f(int signal, void (*handler)(int), int flags)
 679 {
 680         sigset_t block_mask;
 681         struct sigaction saction;
 682
 683         sigfillset(&block_mask);
 684
 685         saction.sa_handler = handler;
 686         saction.sa_mask = block_mask;
 687         saction.sa_flags = flags;
 688         sigaction(signal, &saction, NULL);
 689 }
 690
 691 int get_tty_size(void)
 692 {
 693 #ifdef TIOCGSIZE
 694         struct ttysize ts = {0};
 695         int ret = ioctl(0, TIOCGSIZE, &ts);
 696         return (ret == 0 ? ts.ts_cols : DEFAULT_TTY_SIZE);
 697 #elif defined(TIOCGWINSZ)
 698         struct winsize ts;
 699         memset(&ts, 0, sizeof(ts));
 700         int ret = ioctl(0, TIOCGWINSZ, &ts);
 701         return (ret == 0 ? ts.ws_col : DEFAULT_TTY_SIZE);
 702 #else
 703         return DEFAULT_TTY_SIZE;
 704 #endif
 705 }
 706
 707 short enter_promiscuous_mode(char *ifname)
 708 {
 709         short ifflags;
 710
 711         if (!strncmp("any", ifname, strlen("any")))
 712                 return 0;
 713
 714         ifflags = device_get_flags(ifname);
 715         device_set_flags(ifname, ifflags | IFF_PROMISC);
 716
 717         return ifflags;
 718 }
 719
 720 void leave_promiscuous_mode(char *ifname, short oldflags)
 721 {
 722         if (!strncmp("any", ifname, strlen("any")))
 723                 return;
 724
 725         device_set_flags(ifname, oldflags);
 726 }
 727
 728 int device_up(char *ifname)
 729 {
 730         if (!ifname)
 731                 return -EINVAL;
 732         if (!strncmp("any", ifname, strlen("any")))
 733                 return 1;
 734
 735         return (device_get_flags(ifname) & IFF_UP) == IFF_UP;
 736 }
 737
 738 int device_running(char *ifname)
 739 {
 740         if (!ifname)
 741                 return -EINVAL;
 742         if (!strncmp("any", ifname, strlen("any")))
 743                 return 1;
 744
 745         return (device_get_flags(ifname) & IFF_RUNNING) == IFF_RUNNING;
 746 }
 747
 748 int device_up_and_running(char *ifname)
 749 {
 750         if (!ifname)
 751                 return -EINVAL;
 752         if (!strncmp("any", ifname, strlen("any")))
 753                 return 1;
 754
 755         return (device_get_flags(ifname) & (IFF_UP | IFF_RUNNING)) ==
 756                (IFF_UP | IFF_RUNNING);
 757 }
 758
 759 int poll_error_maybe_die(int sock, struct pollfd *pfd)
 760 {
 761         if ((pfd->revents & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) == 0)
 762                 return POLL_NEXT_PKT;
 763         if (pfd->revents & (POLLHUP | POLLRDHUP))
 764                 panic("Hangup on socket occured!\n");
 765         if (pfd->revents & POLLERR) {
 766                 int tmp;
 767
 768                 errno = 0;
 769                 if (recv(sock, &tmp, sizeof(tmp), MSG_PEEK) >= 0)
 770                         return POLL_NEXT_PKT;
 771                 if (errno == ENETDOWN)
 772                         panic("Interface went down!\n");
 773
 774                 return POLL_MOVE_OUT;
 775         }
 776         if (pfd->revents & POLLNVAL) {
 777                 whine("Invalid polling request on socket!\n");
 778
 779                 return POLL_MOVE_OUT;
 780         }
 781
 782         return POLL_NEXT_PKT;
 783 }
 784
 785 static inline char *next_token(char *q, int sep)
 786 {
 787         if (q)
 788                 q = strchr(q, sep);
 789                 /*
 790                  * glibc defines this as a macro and gcc throws a false
 791                  * positive ``logical ‘&&’ with non-zero constant will
 792                  * always evaluate as true'' in older versions. See:
 793                  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36513
 794                  */
 795         if (q)
 796                 q++;
 797         return q;
 798 }
 799
 800 int set_cpu_affinity(char *str, int inverted)
 801 {
 802         int ret, i, cpus;
 803         char *p, *q;
 804         cpu_set_t cpu_bitmask;
 805
 806         q = str;
 807
 808         cpus = get_number_cpus();
 809
 810         CPU_ZERO(&cpu_bitmask);
 811
 812         for (i = 0; inverted && i < cpus; ++i)
 813                 CPU_SET(i, &cpu_bitmask);
 814
 815         while (p = q, q = next_token(q, ','), p) {
 816                 unsigned int a;  /* Beginning of range */
 817                 unsigned int b;  /* End of range */
 818                 unsigned int s;  /* Stride */
 819                 char *c1, *c2;
 820
 821                 if (sscanf(p, "%u", &a) < 1)
 822                         return -EINVAL;
 823
 824                 b = a;
 825                 s = 1;
 826
 827                 c1 = next_token(p, '-');
 828                 c2 = next_token(p, ',');
 829
 830                 if (c1 != NULL && (c2 == NULL || c1 < c2)) {
 831                         if (sscanf(c1, "%u", &b) < 1)
 832                                 return -EINVAL;
 833
 834                         c1 = next_token(c1, ':');
 835
 836                         if (c1 != NULL && (c2 == NULL || c1 < c2))
 837                                 if (sscanf(c1, "%u", &s) < 1)
 838                                         return -EINVAL;
 839                 }
 840
 841                 if (!(a <= b))
 842                         return -EINVAL;
 843
 844                 while (a <= b) {
 845                         if (inverted)
 846                                 CPU_CLR(a, &cpu_bitmask);
 847                         else
 848                                 CPU_SET(a, &cpu_bitmask);
 849                         a += s;
 850                 }
 851         }
 852
 853         ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
 854                                 &cpu_bitmask);
 855         if (ret)
 856                 panic("Can't set this cpu affinity!\n");
 857
 858         return 0;
 859 }
 860
 861 int set_proc_prio(int priority)
 862 {
 863         /*
 864          * setpriority() is clever, even if you put a nice value which
 865          * is out of range it corrects it to the closest valid nice value
 866          */
 867         int ret = setpriority(PRIO_PROCESS, getpid(), priority);
 868         if (ret)
 869                 panic("Can't set nice val to %i!\n", priority);
 870
 871         return 0;
 872 }
 873
 874 int set_sched_status(int policy, int priority)
 875 {
 876         int ret, min_prio, max_prio;
 877         struct sched_param sp;
 878
 879         max_prio = sched_get_priority_max(policy);
 880         min_prio = sched_get_priority_min(policy);
 881
 882         if (max_prio == -1 || min_prio == -1)
 883                 whine("Cannot determine scheduler prio limits!\n");
 884         else if (priority < min_prio)
 885                 priority = min_prio;
 886         else if (priority > max_prio)
 887                 priority = max_prio;
 888
 889         memset(&sp, 0, sizeof(sp));
 890         sp.sched_priority = priority;
 891
 892         ret = sched_setscheduler(getpid(), policy, &sp);
 893         if (ret) {
 894                 whine("Cannot set scheduler policy!\n");
 895                 return -EINVAL;
 896         }
 897
 898         ret = sched_setparam(getpid(), &sp);
 899         if (ret) {
 900                 whine("Cannot set scheduler prio!\n");
 901                 return -EINVAL;
 902         }
 903
 904         return 0;
 905 }
 906
 907 static inline int ioprio_set(int which, int who, int ioprio)
 908 {
 909         return syscall(SYS_ioprio_set, which, who, ioprio);
 910 }
 911
 912 static inline int ioprio_get(int which, int who)
 913 {
 914         return syscall(SYS_ioprio_get, which, who);
 915 }
 916
 917 static void ioprio_setpid(pid_t pid, int ioprio, int ioclass)
 918 {
 919         int ret = ioprio_set(ioprio_who_process, pid,
 920                              ioprio | ioclass << IOPRIO_CLASS_SHIFT);
 921         if (ret < 0)
 922                 panic("Failed to set io prio for pid!\n");
 923 }
 924
 925 void ioprio_print(void)
 926 {
 927         int ioprio = ioprio_get(ioprio_who_process, getpid());
 928         if (ioprio < 0)
 929                 panic("Failed to fetch io prio for pid!\n");
 930         else {
 931                 int ioclass = ioprio >> IOPRIO_CLASS_SHIFT;
 932                 if (ioclass != ioprio_class_idle) {
 933                         ioprio &= 0xff;
 934                         printf("%s: prio %d\n", to_prio[ioclass], ioprio);
 935                 } else
 936                         printf("%s\n", to_prio[ioclass]);
 937         }
 938 }
 939
 940 void set_ioprio_rt(void)
 941 {
 942         ioprio_setpid(getpid(), 4, ioprio_class_rt);
 943 }
 944
 945 void set_ioprio_be(void)
 946 {
 947         ioprio_setpid(getpid(), 4, ioprio_class_be);
 948 }
 949
 950 int set_timeout(struct timeval *timeval, unsigned int msec)
 951 {
 952         if (msec == 0)
 953                 return -EINVAL;
 954
 955         timeval->tv_sec = 0;
 956         timeval->tv_usec = 0;
 957
 958         if (msec < 1000) {
 959                 timeval->tv_usec = msec * 1000;
 960                 return 0;
 961         }
 962
 963         timeval->tv_sec = (long) (msec / 1000);
 964         timeval->tv_usec = (long) ((msec - (timeval->tv_sec * 1000)) * 1000);
 965
 966         return 0;
 967 }
 968
 969 size_t strlcpy(char *dest, const char *src, size_t size)
 970 {
 971         size_t ret = strlen(src);
 972
 973         if (size) {
 974                 size_t len = (ret >= size) ? size - 1 : ret;
 975
 976                 memcpy(dest, src, len);
 977                 dest[len] = '\0';
 978         }
 979
 980         return ret;
 981 }
 982
 983 int slprintf(char *dst, size_t size, const char *fmt, ...)
 984 {
 985         int ret;
 986         va_list ap;
 987
 988         va_start(ap, fmt);
 989
 990         ret = vsnprintf(dst, size, fmt, ap);
 991         dst[size - 1] = '\0';
 992
 993         va_end(ap);
 994
 995         return ret;
 996 }
 997
 998 noinline void *xmemset(void *s, int c, size_t n)
 999 {
1000         size_t i;
1001         uint8_t *ptr = s;
1002
1003         for (i = 0; i < n; ++i)
1004                 ptr[i] = (uint8_t) c;
1005
1006         return ptr;
1007 }
1008
1009 char *getuint(char *in, uint32_t *out)
1010 {
1011         char *pt = in, tmp;
1012         char *endptr = NULL;
1013
1014         while (*in && (isdigit(*in) || isxdigit(*in) || *in == 'x'))
1015                 in++;
1016         if (!*in)
1017                 panic("Syntax error!\n");
1018         errno = 0;
1019         tmp = *in;
1020         *in = 0;
1021         *out = strtoul(pt, &endptr, 0);
1022         if ((endptr != NULL && *endptr != '\0') || errno != 0) {
1023                 panic("Syntax error!\n");
1024         }
1025         *in = tmp;
1026
1027         return in;
1028 }
1029
1030 char *strtrim_right(register char *p, register char c)
1031 {
1032         register char *end;
1033         register int len;
1034
1035         len = strlen(p);
1036         while (*p && len) {
1037                 end = p + len - 1;
1038                 if (c == *end)
1039                         *end = 0;
1040                 else
1041                         break;
1042                 len = strlen(p);
1043         }
1044
1045         return p;
1046 }
1047
1048 char *strtrim_left(register char *p, register char c)
1049 {
1050         register int len;
1051
1052         len = strlen(p);
1053         while (*p && len--) {
1054                 if (c == *p)
1055                         p++;
1056                 else
1057                         break;
1058         }
1059
1060         return p;
1061 }
1062