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 u32 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 u32 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_2500:
 367         case SPEED_10000:
 368                 bitrate = ecmd.speed;
 369                 break;
 370         default:
 371                 bitrate = 0;
 372                 break;
 373         };
 374 out:
 375         close(sock);
 376
 377         return bitrate;
 378 }
 379
 380 int ethtool_link(const char *ifname)
 381 {
 382         int ret, sock;
 383         struct ifreq ifr;
 384         struct ethtool_value ecmd;
 385
 386         sock = af_socket(AF_INET);
 387
 388         memset(&ecmd, 0, sizeof(ecmd));
 389
 390         memset(&ifr, 0, sizeof(ifr));
 391         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 392
 393         ecmd.cmd = ETHTOOL_GLINK;
 394         ifr.ifr_data = (char *) &ecmd;
 395
 396         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 397         if (ret)
 398                 ret = -EINVAL;
 399         else
 400                 ret = !!ecmd.data;
 401
 402         close(sock);
 403         return ret;
 404 }
 405
 406 int ethtool_drvinf(const char *ifname, struct ethtool_drvinfo *drvinf)
 407 {
 408         int ret, sock;
 409         struct ifreq ifr;
 410
 411         sock = af_socket(AF_INET);
 412
 413         memset(drvinf, 0, sizeof(*drvinf));
 414
 415         memset(&ifr, 0, sizeof(ifr));
 416         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 417
 418         drvinf->cmd = ETHTOOL_GDRVINFO;
 419         ifr.ifr_data = (char *) drvinf;
 420
 421         ret = ioctl(sock, SIOCETHTOOL, &ifr);
 422
 423         close(sock);
 424
 425         return ret;
 426 }
 427
 428 u32 device_bitrate(const char *ifname)
 429 {
 430         u32 speed_c, speed_w;
 431
 432         speed_c = ethtool_bitrate(ifname);
 433         speed_w = wireless_bitrate(ifname);
 434
 435         return (speed_c == 0 ? speed_w : speed_c);
 436 }
 437
 438 int device_ifindex(const char *ifname)
 439 {
 440         int ret, sock, index;
 441         struct ifreq ifr;
 442
 443         if (!strncmp("any", ifname, strlen("any")))
 444                 return 0;
 445
 446         sock = af_socket(AF_INET);
 447
 448         memset(&ifr, 0, sizeof(ifr));
 449         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 450
 451         ret = ioctl(sock, SIOCGIFINDEX, &ifr);
 452         if (!ret)
 453                 index = ifr.ifr_ifindex;
 454         else
 455                 index = -1;
 456
 457         close(sock);
 458
 459         return index;
 460 }
 461
 462 static int __device_address6(const char *ifname, struct sockaddr_storage *ss)
 463 {
 464         int ret, family, found = -EINVAL;
 465         struct ifaddrs *ifaddr, *ifa;
 466
 467         ret = getifaddrs(&ifaddr);
 468         if (ret < 0)
 469                 panic("Cannot get device addresses for IPv6!\n");
 470
 471         for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
 472                 family = ifa->ifa_addr->sa_family;
 473                 if (family != AF_INET6)
 474                         continue;
 475                 if (strcmp(ifa->ifa_name, ifname))
 476                         continue;
 477
 478                 memcpy(ss, ifa->ifa_addr, sizeof(*ss));
 479                 found = 0;
 480                 break;
 481         }
 482
 483         freeifaddrs(ifaddr);
 484         return found;
 485 }
 486
 487 int device_address(const char *ifname, int af, struct sockaddr_storage *ss)
 488 {
 489         int ret, sock;
 490         struct ifreq ifr;
 491
 492         if (!ss)
 493                 return -EINVAL;
 494         if (!strncmp("any", ifname, strlen("any")))
 495                 return -EINVAL;
 496         if (af == AF_INET6)
 497                 return __device_address6(ifname, ss);
 498
 499         sock = af_socket(af);
 500
 501         memset(&ifr, 0, sizeof(ifr));
 502         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 503
 504         ifr.ifr_addr.sa_family = af;
 505
 506         ret = ioctl(sock, SIOCGIFADDR, &ifr);
 507         if (!ret)
 508                 memcpy(ss, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
 509
 510         close(sock);
 511
 512         return ret;
 513 }
 514
 515 int device_mtu(const char *ifname)
 516 {
 517         int ret, sock, mtu;
 518         struct ifreq ifr;
 519
 520         sock = af_socket(AF_INET);
 521
 522         memset(&ifr, 0, sizeof(ifr));
 523         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 524
 525         ret = ioctl(sock, SIOCGIFMTU, &ifr);
 526         if (!ret)
 527                 mtu = ifr.ifr_mtu;
 528         else
 529                 mtu = 0;
 530
 531         close(sock);
 532
 533         return mtu;
 534 }
 535
 536 short device_get_flags(const char *ifname)
 537 {
 538         /* Really, it's short! Look at struct ifreq */
 539         short flags;
 540         int ret, sock;
 541         struct ifreq ifr;
 542
 543         sock = af_socket(AF_INET);
 544
 545         memset(&ifr, 0, sizeof(ifr));
 546         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 547
 548         ret = ioctl(sock, SIOCGIFFLAGS, &ifr);
 549         if (!ret)
 550                 flags = ifr.ifr_flags;
 551         else
 552                 flags = 0;
 553
 554         close(sock);
 555
 556         return flags;
 557 }
 558
 559 void device_set_flags(const char *ifname, const short flags)
 560 {
 561         int ret, sock;
 562         struct ifreq ifr;
 563
 564         sock = af_socket(AF_INET);
 565
 566         memset(&ifr, 0, sizeof(ifr));
 567         strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
 568
 569         ifr.ifr_flags = flags;
 570
 571         ret = ioctl(sock, SIOCSIFFLAGS, &ifr);
 572         if (ret < 0)
 573                 panic("Cannot set NIC flags!\n");
 574
 575         close(sock);
 576 }
 577
 578 /* XXX: also probe ethtool driver name if it fails */
 579 int device_irq_number(const char *ifname)
 580 {
 581         /*
 582          * Since fetching IRQ numbers from SIOCGIFMAP is deprecated and not
 583          * supported anymore, we need to grab them from procfs
 584          */
 585         int irq = 0;
 586         char *buffp;
 587         char buff[512];
 588         char sysname[512];
 589         FILE *fp;
 590
 591         if (!strncmp("lo", ifname, strlen("lo")))
 592                 return 0;
 593
 594         fp = fopen("/proc/interrupts", "r");
 595         if (!fp) {
 596                 whine("Cannot open /proc/interrupts!\n");
 597                 return -ENOENT;
 598         }
 599
 600         memset(buff, 0, sizeof(buff));
 601         while (fgets(buff, sizeof(buff), fp) != NULL) {
 602                 buff[sizeof(buff) - 1] = 0;
 603
 604                 if (strstr(buff, ifname) == NULL)
 605                         continue;
 606
 607                 buffp = buff;
 608                 while (*buffp != ':')
 609                         buffp++;
 610                 *buffp = 0;
 611                 irq = atoi(buff);
 612
 613                 memset(buff, 0, sizeof(buff));
 614         }
 615
 616         fclose(fp);
 617
 618         if (irq != 0)
 619                 return irq;
 620         /*
 621          * Try sysfs as fallback. Probably wireless devices will be found
 622          * here. We return silently if it fails ...
 623          */
 624         slprintf(sysname, sizeof(sysname), "/sys/class/net/%s/device/irq",
 625                  ifname);
 626
 627         fp = fopen(sysname, "r");
 628         if (!fp)
 629                 return -ENOENT;
 630
 631         memset(buff, 0, sizeof(buff));
 632         if(fgets(buff, sizeof(buff), fp) != NULL) {
 633                 buff[sizeof(buff) - 1] = 0;
 634                 irq = atoi(buff);
 635         }
 636
 637         fclose(fp);
 638
 639         return irq;
 640 }
 641
 642 int device_set_irq_affinity_list(int irq, unsigned long from, unsigned long to)
 643 {
 644         int ret, fd;
 645         char file[256], list[64];
 646
 647         slprintf(file, sizeof(file), "/proc/irq/%d/smp_affinity_list", irq);
 648         slprintf(list, sizeof(list), "%lu-%lu\n", from, to);
 649
 650         fd = open(file, O_WRONLY);
 651         if (fd < 0) {
 652                 whine("Cannot open file %s!\n", file);
 653                 return -ENOENT;
 654         }
 655
 656         ret = write(fd, list, strlen(list));
 657
 658         close(fd);
 659         return ret;
 660 }
 661
 662 int device_bind_irq_to_cpu(int irq, int cpu)
 663 {
 664         int ret;
 665         char buff[256];
 666         char file[256];
 667         FILE *fp;
 668
 669         /* Note: first CPU begins with CPU 0 */
 670         if (irq < 0 || cpu < 0)
 671                 return -EINVAL;
 672
 673         memset(file, 0, sizeof(file));
 674         memset(buff, 0, sizeof(buff));
 675
 676         /* smp_affinity starts counting with CPU 1, 2, ... */
 677         cpu = cpu + 1;
 678         sprintf(file, "/proc/irq/%d/smp_affinity", irq);
 679
 680         fp = fopen(file, "w");
 681         if (!fp) {
 682                 whine("Cannot open file %s!\n", file);
 683                 return -ENOENT;
 684         }
 685
 686         sprintf(buff, "%d", cpu);
 687         ret = fwrite(buff, sizeof(buff), 1, fp);
 688
 689         fclose(fp);
 690         return (ret > 0 ? 0 : ret);
 691 }
 692
 693 void sock_print_net_stats(int sock, unsigned long skipped)
 694 {
 695         int ret;
 696         struct tpacket_stats kstats;
 697
 698         socklen_t slen = sizeof(kstats);
 699
 700         memset(&kstats, 0, sizeof(kstats));
 701
 702         ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
 703         if (ret > -1) {
 704                 uint64_t packets = kstats.tp_packets;
 705                 uint64_t drops = kstats.tp_drops;
 706
 707                 printf("\r%12ld  packets incoming\n", packets);
 708                 printf("\r%12ld  packets passed filter\n",
 709                        packets - drops - skipped);
 710                 printf("\r%12ld  packets failed filter (out of space)\n",
 711                        drops + skipped);
 712                 if (kstats.tp_packets > 0)
 713                         printf("\r%12.4f%\% packet droprate\n",
 714                                1.f * drops / packets * 100.f);
 715         }
 716 }
 717
 718 void register_signal(int signal, void (*handler)(int))
 719 {
 720         sigset_t block_mask;
 721         struct sigaction saction;
 722
 723         sigfillset(&block_mask);
 724
 725         saction.sa_handler = handler;
 726         saction.sa_mask = block_mask;
 727         saction.sa_flags = SA_RESTART;
 728         sigaction(signal, &saction, NULL);
 729 }
 730
 731 void register_signal_f(int signal, void (*handler)(int), int flags)
 732 {
 733         sigset_t block_mask;
 734         struct sigaction saction;
 735
 736         sigfillset(&block_mask);
 737
 738         saction.sa_handler = handler;
 739         saction.sa_mask = block_mask;
 740         saction.sa_flags = flags;
 741         sigaction(signal, &saction, NULL);
 742 }
 743
 744 int get_tty_size(void)
 745 {
 746 #ifdef TIOCGSIZE
 747         struct ttysize ts = {0};
 748         return (ioctl(0, TIOCGSIZE, &ts) == 0 ?
 749                 ts.ts_cols : DEFAULT_TTY_SIZE);
 750 #elif defined(TIOCGWINSZ)
 751         struct winsize ts;
 752         return (ioctl(0, TIOCGWINSZ, &ts) == 0 ?
 753                 ts.ws_col : DEFAULT_TTY_SIZE);
 754 #else
 755         return DEFAULT_TTY_SIZE;
 756 #endif
 757 }
 758
 759 short enter_promiscuous_mode(char *ifname)
 760 {
 761         short ifflags;
 762
 763         if (!strncmp("any", ifname, strlen("any")))
 764                 return 0;
 765
 766         ifflags = device_get_flags(ifname);
 767         device_set_flags(ifname, ifflags | IFF_PROMISC);
 768
 769         return ifflags;
 770 }
 771
 772 void leave_promiscuous_mode(char *ifname, short oldflags)
 773 {
 774         if (!strncmp("any", ifname, strlen("any")))
 775                 return;
 776
 777         device_set_flags(ifname, oldflags);
 778 }
 779
 780 int device_up(char *ifname)
 781 {
 782         if (!ifname)
 783                 return -EINVAL;
 784         if (!strncmp("any", ifname, strlen("any")))
 785                 return 1;
 786
 787         return (device_get_flags(ifname) & IFF_UP) == IFF_UP;
 788 }
 789
 790 int device_running(char *ifname)
 791 {
 792         if (!ifname)
 793                 return -EINVAL;
 794         if (!strncmp("any", ifname, strlen("any")))
 795                 return 1;
 796
 797         return (device_get_flags(ifname) & IFF_RUNNING) == IFF_RUNNING;
 798 }
 799
 800 int device_up_and_running(char *ifname)
 801 {
 802         if (!ifname)
 803                 return -EINVAL;
 804         if (!strncmp("any", ifname, strlen("any")))
 805                 return 1;
 806
 807         return (device_get_flags(ifname) & (IFF_UP | IFF_RUNNING)) ==
 808                (IFF_UP | IFF_RUNNING);
 809 }
 810
 811 int poll_error_maybe_die(int sock, struct pollfd *pfd)
 812 {
 813         if ((pfd->revents & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) == 0)
 814                 return POLL_NEXT_PKT;
 815         if (pfd->revents & (POLLHUP | POLLRDHUP))
 816                 panic("Hangup on socket occured!\n");
 817         if (pfd->revents & POLLERR) {
 818                 int tmp;
 819
 820                 errno = 0;
 821                 if (recv(sock, &tmp, sizeof(tmp), MSG_PEEK) >= 0)
 822                         return POLL_NEXT_PKT;
 823                 if (errno == ENETDOWN)
 824                         panic("Interface went down!\n");
 825
 826                 return POLL_MOVE_OUT;
 827         }
 828         if (pfd->revents & POLLNVAL) {
 829                 whine("Invalid polling request on socket!\n");
 830
 831                 return POLL_MOVE_OUT;
 832         }
 833
 834         return POLL_NEXT_PKT;
 835 }
 836
 837 static inline char *next_token(char *q, int sep)
 838 {
 839         if (q)
 840                 q = strchr(q, sep);
 841                 /*
 842                  * glibc defines this as a macro and gcc throws a false
 843                  * positive ``logical ‘&&’ with non-zero constant will
 844                  * always evaluate as true'' in older versions. See:
 845                  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36513
 846                  */
 847         if (q)
 848                 q++;
 849         return q;
 850 }
 851
 852 void cpu_affinity(int cpu)
 853 {
 854         int ret;
 855         cpu_set_t cpu_bitmask;
 856
 857         CPU_ZERO(&cpu_bitmask);
 858         CPU_SET(cpu, &cpu_bitmask);
 859
 860         ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
 861                                 &cpu_bitmask);
 862         if (ret)
 863                 panic("Can't set this cpu affinity!\n");
 864 }
 865
 866 int set_cpu_affinity(char *str, int inverted)
 867 {
 868         int ret, i, cpus;
 869         char *p, *q;
 870         cpu_set_t cpu_bitmask;
 871
 872         q = str;
 873
 874         cpus = get_number_cpus();
 875
 876         CPU_ZERO(&cpu_bitmask);
 877
 878         for (i = 0; inverted && i < cpus; ++i)
 879                 CPU_SET(i, &cpu_bitmask);
 880
 881         while (p = q, q = next_token(q, ','), p) {
 882                 unsigned int a;  /* Beginning of range */
 883                 unsigned int b;  /* End of range */
 884                 unsigned int s;  /* Stride */
 885                 char *c1, *c2;
 886
 887                 if (sscanf(p, "%u", &a) < 1)
 888                         return -EINVAL;
 889
 890                 b = a;
 891                 s = 1;
 892
 893                 c1 = next_token(p, '-');
 894                 c2 = next_token(p, ',');
 895
 896                 if (c1 != NULL && (c2 == NULL || c1 < c2)) {
 897                         if (sscanf(c1, "%u", &b) < 1)
 898                                 return -EINVAL;
 899
 900                         c1 = next_token(c1, ':');
 901
 902                         if (c1 != NULL && (c2 == NULL || c1 < c2))
 903                                 if (sscanf(c1, "%u", &s) < 1)
 904                                         return -EINVAL;
 905                 }
 906
 907                 if (!(a <= b))
 908                         return -EINVAL;
 909
 910                 while (a <= b) {
 911                         if (inverted)
 912                                 CPU_CLR(a, &cpu_bitmask);
 913                         else
 914                                 CPU_SET(a, &cpu_bitmask);
 915                         a += s;
 916                 }
 917         }
 918
 919         ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
 920                                 &cpu_bitmask);
 921         if (ret)
 922                 panic("Can't set this cpu affinity!\n");
 923
 924         return 0;
 925 }
 926
 927 int set_proc_prio(int priority)
 928 {
 929         /*
 930          * setpriority() is clever, even if you put a nice value which
 931          * is out of range it corrects it to the closest valid nice value
 932          */
 933         int ret = setpriority(PRIO_PROCESS, getpid(), priority);
 934         if (ret)
 935                 panic("Can't set nice val to %i!\n", priority);
 936
 937         return 0;
 938 }
 939
 940 int set_sched_status(int policy, int priority)
 941 {
 942         int ret, min_prio, max_prio;
 943         struct sched_param sp;
 944
 945         max_prio = sched_get_priority_max(policy);
 946         min_prio = sched_get_priority_min(policy);
 947
 948         if (max_prio == -1 || min_prio == -1)
 949                 whine("Cannot determine scheduler prio limits!\n");
 950         else if (priority < min_prio)
 951                 priority = min_prio;
 952         else if (priority > max_prio)
 953                 priority = max_prio;
 954
 955         memset(&sp, 0, sizeof(sp));
 956         sp.sched_priority = priority;
 957
 958         ret = sched_setscheduler(getpid(), policy, &sp);
 959         if (ret) {
 960                 whine("Cannot set scheduler policy!\n");
 961                 return -EINVAL;
 962         }
 963
 964         ret = sched_setparam(getpid(), &sp);
 965         if (ret) {
 966                 whine("Cannot set scheduler prio!\n");
 967                 return -EINVAL;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static inline int ioprio_set(int which, int who, int ioprio)
 974 {
 975         return syscall(SYS_ioprio_set, which, who, ioprio);
 976 }
 977
 978 static inline int ioprio_get(int which, int who)
 979 {
 980         return syscall(SYS_ioprio_get, which, who);
 981 }
 982
 983 static void ioprio_setpid(pid_t pid, int ioprio, int ioclass)
 984 {
 985         int ret = ioprio_set(ioprio_who_process, pid,
 986                              ioprio | ioclass << IOPRIO_CLASS_SHIFT);
 987         if (ret < 0)
 988                 panic("Failed to set io prio for pid!\n");
 989 }
 990
 991 void ioprio_print(void)
 992 {
 993         int ioprio = ioprio_get(ioprio_who_process, getpid());
 994         if (ioprio < 0)
 995                 panic("Failed to fetch io prio for pid!\n");
 996         else {
 997                 int ioclass = ioprio >> IOPRIO_CLASS_SHIFT;
 998                 if (ioclass != ioprio_class_idle) {
 999                         ioprio &= 0xff;
1000                         printf("%s: prio %d\n", to_prio[ioclass], ioprio);
1001                 } else
1002                         printf("%s\n", to_prio[ioclass]);
1003         }
1004 }
1005
1006 void set_ioprio_rt(void)
1007 {
1008         ioprio_setpid(getpid(), 4, ioprio_class_rt);
1009 }
1010
1011 void set_ioprio_be(void)
1012 {
1013         ioprio_setpid(getpid(), 4, ioprio_class_be);
1014 }
1015
1016 int set_timeout(struct timeval *timeval, unsigned int msec)
1017 {
1018         if (msec == 0)
1019                 return -EINVAL;
1020
1021         timeval->tv_sec = 0;
1022         timeval->tv_usec = 0;
1023
1024         if (msec < 1000) {
1025                 timeval->tv_usec = msec * 1000;
1026                 return 0;
1027         }
1028
1029         timeval->tv_sec = (long) (msec / 1000);
1030         timeval->tv_usec = (long) ((msec - (timeval->tv_sec * 1000)) * 1000);
1031
1032         return 0;
1033 }
1034
1035 size_t strlcpy(char *dest, const char *src, size_t size)
1036 {
1037         size_t ret = strlen(src);
1038
1039         if (size) {
1040                 size_t len = (ret >= size) ? size - 1 : ret;
1041
1042                 memcpy(dest, src, len);
1043                 dest[len] = '\0';
1044         }
1045
1046         return ret;
1047 }
1048
1049 static inline int vslprintf(char *dst, size_t size, const char *fmt, va_list ap)
1050 {
1051         int ret;
1052
1053         ret = vsnprintf(dst, size, fmt, ap);
1054         dst[size - 1] = '\0';
1055
1056         return ret;
1057 }
1058
1059 int slprintf(char *dst, size_t size, const char *fmt, ...)
1060 {
1061         int ret;
1062         va_list ap;
1063
1064         va_start(ap, fmt);
1065         ret = vslprintf(dst, size, fmt, ap);
1066         va_end(ap);
1067
1068         return ret;
1069 }
1070
1071 int slprintf_nocheck(char *dst, size_t size, const char *fmt, ...)
1072 {
1073         int ret;
1074         va_list ap;
1075
1076         va_start(ap, fmt);
1077         ret = vslprintf(dst, size, fmt, ap);
1078         va_end(ap);
1079
1080         return ret;
1081 }
1082
1083 noinline void *xmemset(void *s, int c, size_t n)
1084 {
1085         size_t i;
1086         uint8_t *ptr = s;
1087
1088         for (i = 0; i < n; ++i)
1089                 ptr[i] = (uint8_t) c;
1090
1091         return ptr;
1092 }
1093
1094 char *getuint(char *in, uint32_t *out)
1095 {
1096         char *pt = in, tmp;
1097         char *endptr = NULL;
1098
1099         while (*in && (isdigit(*in) || isxdigit(*in) || *in == 'x'))
1100                 in++;
1101         if (!*in)
1102                 panic("Syntax error!\n");
1103         errno = 0;
1104         tmp = *in;
1105         *in = 0;
1106         *out = strtoul(pt, &endptr, 0);
1107         if ((endptr != NULL && *endptr != '\0') || errno != 0) {
1108                 panic("Syntax error!\n");
1109         }
1110         *in = tmp;
1111
1112         return in;
1113 }
1114
1115 char *strtrim_right(register char *p, register char c)
1116 {
1117         register char *end;
1118         register int len;
1119
1120         len = strlen(p);
1121         while (*p && len) {
1122                 end = p + len - 1;
1123                 if (c == *end)
1124                         *end = 0;
1125                 else
1126                         break;
1127                 len = strlen(p);
1128         }
1129
1130         return p;
1131 }
1132
1133 char *strtrim_left(register char *p, register char c)
1134 {
1135         register int len;
1136
1137         len = strlen(p);
1138         while (*p && len--) {
1139                 if (c == *p)
1140                         p++;
1141                 else
1142                         break;
1143         }
1144
1145         return p;
1146 }