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 int device_irq_number(const char *ifname)
 579 {
 580         /*
 581          * Since fetching IRQ numbers from SIOCGIFMAP is deprecated and not
 582          * supported anymore, we need to grab them from procfs
 583          */
 584         int irq = 0;
 585         char *buffp;
 586         char buff[512];
 587         char sysname[512];
 588         FILE *fp;
 589
 590         if (!strncmp("lo", ifname, strlen("lo")))
 591                 return 0;
 592
 593         fp = fopen("/proc/interrupts", "r");
 594         if (!fp) {
 595                 whine("Cannot open /proc/interrupts!\n");
 596                 return -ENOENT;
 597         }
 598
 599         memset(buff, 0, sizeof(buff));
 600         while (fgets(buff, sizeof(buff), fp) != NULL) {
 601                 buff[sizeof(buff) - 1] = 0;
 602
 603                 if (strstr(buff, ifname) == NULL)
 604                         continue;
 605
 606                 buffp = buff;
 607                 while (*buffp != ':')
 608                         buffp++;
 609                 *buffp = 0;
 610                 irq = atoi(buff);
 611
 612                 memset(buff, 0, sizeof(buff));
 613         }
 614
 615         fclose(fp);
 616
 617         if (irq != 0)
 618                 return irq;
 619         /*
 620          * Try sysfs as fallback. Probably wireless devices will be found
 621          * here. We return silently if it fails ...
 622          */
 623         slprintf(sysname, sizeof(sysname), "/sys/class/net/%s/device/irq",
 624                  ifname);
 625
 626         fp = fopen(sysname, "r");
 627         if (!fp)
 628                 return -ENOENT;
 629
 630         memset(buff, 0, sizeof(buff));
 631         if(fgets(buff, sizeof(buff), fp) != NULL) {
 632                 buff[sizeof(buff) - 1] = 0;
 633                 irq = atoi(buff);
 634         }
 635
 636         fclose(fp);
 637
 638         return irq;
 639 }
 640
 641 int device_bind_irq_to_cpu(int irq, int cpu)
 642 {
 643         int ret;
 644         char buff[256];
 645         char file[256];
 646         FILE *fp;
 647
 648         /* Note: first CPU begins with CPU 0 */
 649         if (irq < 0 || cpu < 0)
 650                 return -EINVAL;
 651
 652         memset(file, 0, sizeof(file));
 653         memset(buff, 0, sizeof(buff));
 654
 655         /* smp_affinity starts counting with CPU 1, 2, ... */
 656         cpu = cpu + 1;
 657         sprintf(file, "/proc/irq/%d/smp_affinity", irq);
 658
 659         fp = fopen(file, "w");
 660         if (!fp) {
 661                 whine("Cannot open file %s!\n", file);
 662                 return -ENOENT;
 663         }
 664
 665         sprintf(buff, "%d", cpu);
 666         ret = fwrite(buff, sizeof(buff), 1, fp);
 667
 668         fclose(fp);
 669         return (ret > 0 ? 0 : ret);
 670 }
 671
 672 void sock_print_net_stats(int sock, unsigned long skipped)
 673 {
 674         int ret;
 675         struct tpacket_stats kstats;
 676
 677         socklen_t slen = sizeof(kstats);
 678
 679         memset(&kstats, 0, sizeof(kstats));
 680
 681         ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
 682         if (ret > -1) {
 683                 uint64_t packets = kstats.tp_packets;
 684                 uint64_t drops = kstats.tp_drops;
 685
 686                 printf("\r%12ld  frames incoming\n", packets);
 687                 printf("\r%12ld  frames passed filter\n",
 688                        packets - drops - skipped);
 689                 printf("\r%12ld  frames failed filter (out of space)\n",
 690                        drops + skipped);
 691                 if (kstats.tp_packets > 0)
 692                         printf("\r%12.4f%\% frame droprate\n",
 693                                1.f * drops / packets * 100.f);
 694         }
 695 }
 696
 697 void register_signal(int signal, void (*handler)(int))
 698 {
 699         sigset_t block_mask;
 700         struct sigaction saction;
 701
 702         sigfillset(&block_mask);
 703
 704         saction.sa_handler = handler;
 705         saction.sa_mask = block_mask;
 706         saction.sa_flags = SA_RESTART;
 707         sigaction(signal, &saction, NULL);
 708 }
 709
 710 void register_signal_f(int signal, void (*handler)(int), int flags)
 711 {
 712         sigset_t block_mask;
 713         struct sigaction saction;
 714
 715         sigfillset(&block_mask);
 716
 717         saction.sa_handler = handler;
 718         saction.sa_mask = block_mask;
 719         saction.sa_flags = flags;
 720         sigaction(signal, &saction, NULL);
 721 }
 722
 723 int get_tty_size(void)
 724 {
 725 #ifdef TIOCGSIZE
 726         struct ttysize ts = {0};
 727         return (ioctl(0, TIOCGSIZE, &ts) == 0 ?
 728                 ts.ts_cols : DEFAULT_TTY_SIZE);
 729 #elif defined(TIOCGWINSZ)
 730         struct winsize ts;
 731         return (ioctl(0, TIOCGWINSZ, &ts) == 0 ?
 732                 ts.ws_col : DEFAULT_TTY_SIZE);
 733 #else
 734         return DEFAULT_TTY_SIZE;
 735 #endif
 736 }
 737
 738 short enter_promiscuous_mode(char *ifname)
 739 {
 740         short ifflags;
 741
 742         if (!strncmp("any", ifname, strlen("any")))
 743                 return 0;
 744
 745         ifflags = device_get_flags(ifname);
 746         device_set_flags(ifname, ifflags | IFF_PROMISC);
 747
 748         return ifflags;
 749 }
 750
 751 void leave_promiscuous_mode(char *ifname, short oldflags)
 752 {
 753         if (!strncmp("any", ifname, strlen("any")))
 754                 return;
 755
 756         device_set_flags(ifname, oldflags);
 757 }
 758
 759 int device_up(char *ifname)
 760 {
 761         if (!ifname)
 762                 return -EINVAL;
 763         if (!strncmp("any", ifname, strlen("any")))
 764                 return 1;
 765
 766         return (device_get_flags(ifname) & IFF_UP) == IFF_UP;
 767 }
 768
 769 int device_running(char *ifname)
 770 {
 771         if (!ifname)
 772                 return -EINVAL;
 773         if (!strncmp("any", ifname, strlen("any")))
 774                 return 1;
 775
 776         return (device_get_flags(ifname) & IFF_RUNNING) == IFF_RUNNING;
 777 }
 778
 779 int device_up_and_running(char *ifname)
 780 {
 781         if (!ifname)
 782                 return -EINVAL;
 783         if (!strncmp("any", ifname, strlen("any")))
 784                 return 1;
 785
 786         return (device_get_flags(ifname) & (IFF_UP | IFF_RUNNING)) ==
 787                (IFF_UP | IFF_RUNNING);
 788 }
 789
 790 int poll_error_maybe_die(int sock, struct pollfd *pfd)
 791 {
 792         if ((pfd->revents & (POLLHUP | POLLRDHUP | POLLERR | POLLNVAL)) == 0)
 793                 return POLL_NEXT_PKT;
 794         if (pfd->revents & (POLLHUP | POLLRDHUP))
 795                 panic("Hangup on socket occured!\n");
 796         if (pfd->revents & POLLERR) {
 797                 int tmp;
 798
 799                 errno = 0;
 800                 if (recv(sock, &tmp, sizeof(tmp), MSG_PEEK) >= 0)
 801                         return POLL_NEXT_PKT;
 802                 if (errno == ENETDOWN)
 803                         panic("Interface went down!\n");
 804
 805                 return POLL_MOVE_OUT;
 806         }
 807         if (pfd->revents & POLLNVAL) {
 808                 whine("Invalid polling request on socket!\n");
 809
 810                 return POLL_MOVE_OUT;
 811         }
 812
 813         return POLL_NEXT_PKT;
 814 }
 815
 816 static inline char *next_token(char *q, int sep)
 817 {
 818         if (q)
 819                 q = strchr(q, sep);
 820                 /*
 821                  * glibc defines this as a macro and gcc throws a false
 822                  * positive ``logical ‘&&’ with non-zero constant will
 823                  * always evaluate as true'' in older versions. See:
 824                  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36513
 825                  */
 826         if (q)
 827                 q++;
 828         return q;
 829 }
 830
 831 int set_cpu_affinity(char *str, int inverted)
 832 {
 833         int ret, i, cpus;
 834         char *p, *q;
 835         cpu_set_t cpu_bitmask;
 836
 837         q = str;
 838
 839         cpus = get_number_cpus();
 840
 841         CPU_ZERO(&cpu_bitmask);
 842
 843         for (i = 0; inverted && i < cpus; ++i)
 844                 CPU_SET(i, &cpu_bitmask);
 845
 846         while (p = q, q = next_token(q, ','), p) {
 847                 unsigned int a;  /* Beginning of range */
 848                 unsigned int b;  /* End of range */
 849                 unsigned int s;  /* Stride */
 850                 char *c1, *c2;
 851
 852                 if (sscanf(p, "%u", &a) < 1)
 853                         return -EINVAL;
 854
 855                 b = a;
 856                 s = 1;
 857
 858                 c1 = next_token(p, '-');
 859                 c2 = next_token(p, ',');
 860
 861                 if (c1 != NULL && (c2 == NULL || c1 < c2)) {
 862                         if (sscanf(c1, "%u", &b) < 1)
 863                                 return -EINVAL;
 864
 865                         c1 = next_token(c1, ':');
 866
 867                         if (c1 != NULL && (c2 == NULL || c1 < c2))
 868                                 if (sscanf(c1, "%u", &s) < 1)
 869                                         return -EINVAL;
 870                 }
 871
 872                 if (!(a <= b))
 873                         return -EINVAL;
 874
 875                 while (a <= b) {
 876                         if (inverted)
 877                                 CPU_CLR(a, &cpu_bitmask);
 878                         else
 879                                 CPU_SET(a, &cpu_bitmask);
 880                         a += s;
 881                 }
 882         }
 883
 884         ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
 885                                 &cpu_bitmask);
 886         if (ret)
 887                 panic("Can't set this cpu affinity!\n");
 888
 889         return 0;
 890 }
 891
 892 int set_proc_prio(int priority)
 893 {
 894         /*
 895          * setpriority() is clever, even if you put a nice value which
 896          * is out of range it corrects it to the closest valid nice value
 897          */
 898         int ret = setpriority(PRIO_PROCESS, getpid(), priority);
 899         if (ret)
 900                 panic("Can't set nice val to %i!\n", priority);
 901
 902         return 0;
 903 }
 904
 905 int set_sched_status(int policy, int priority)
 906 {
 907         int ret, min_prio, max_prio;
 908         struct sched_param sp;
 909
 910         max_prio = sched_get_priority_max(policy);
 911         min_prio = sched_get_priority_min(policy);
 912
 913         if (max_prio == -1 || min_prio == -1)
 914                 whine("Cannot determine scheduler prio limits!\n");
 915         else if (priority < min_prio)
 916                 priority = min_prio;
 917         else if (priority > max_prio)
 918                 priority = max_prio;
 919
 920         memset(&sp, 0, sizeof(sp));
 921         sp.sched_priority = priority;
 922
 923         ret = sched_setscheduler(getpid(), policy, &sp);
 924         if (ret) {
 925                 whine("Cannot set scheduler policy!\n");
 926                 return -EINVAL;
 927         }
 928
 929         ret = sched_setparam(getpid(), &sp);
 930         if (ret) {
 931                 whine("Cannot set scheduler prio!\n");
 932                 return -EINVAL;
 933         }
 934
 935         return 0;
 936 }
 937
 938 static inline int ioprio_set(int which, int who, int ioprio)
 939 {
 940         return syscall(SYS_ioprio_set, which, who, ioprio);
 941 }
 942
 943 static inline int ioprio_get(int which, int who)
 944 {
 945         return syscall(SYS_ioprio_get, which, who);
 946 }
 947
 948 static void ioprio_setpid(pid_t pid, int ioprio, int ioclass)
 949 {
 950         int ret = ioprio_set(ioprio_who_process, pid,
 951                              ioprio | ioclass << IOPRIO_CLASS_SHIFT);
 952         if (ret < 0)
 953                 panic("Failed to set io prio for pid!\n");
 954 }
 955
 956 void ioprio_print(void)
 957 {
 958         int ioprio = ioprio_get(ioprio_who_process, getpid());
 959         if (ioprio < 0)
 960                 panic("Failed to fetch io prio for pid!\n");
 961         else {
 962                 int ioclass = ioprio >> IOPRIO_CLASS_SHIFT;
 963                 if (ioclass != ioprio_class_idle) {
 964                         ioprio &= 0xff;
 965                         printf("%s: prio %d\n", to_prio[ioclass], ioprio);
 966                 } else
 967                         printf("%s\n", to_prio[ioclass]);
 968         }
 969 }
 970
 971 void set_ioprio_rt(void)
 972 {
 973         ioprio_setpid(getpid(), 4, ioprio_class_rt);
 974 }
 975
 976 void set_ioprio_be(void)
 977 {
 978         ioprio_setpid(getpid(), 4, ioprio_class_be);
 979 }
 980
 981 int set_timeout(struct timeval *timeval, unsigned int msec)
 982 {
 983         if (msec == 0)
 984                 return -EINVAL;
 985
 986         timeval->tv_sec = 0;
 987         timeval->tv_usec = 0;
 988
 989         if (msec < 1000) {
 990                 timeval->tv_usec = msec * 1000;
 991                 return 0;
 992         }
 993
 994         timeval->tv_sec = (long) (msec / 1000);
 995         timeval->tv_usec = (long) ((msec - (timeval->tv_sec * 1000)) * 1000);
 996
 997         return 0;
 998 }
 999
1000 size_t strlcpy(char *dest, const char *src, size_t size)
1001 {
1002         size_t ret = strlen(src);
1003
1004         if (size) {
1005                 size_t len = (ret >= size) ? size - 1 : ret;
1006
1007                 memcpy(dest, src, len);
1008                 dest[len] = '\0';
1009         }
1010
1011         return ret;
1012 }
1013
1014 int slprintf(char *dst, size_t size, const char *fmt, ...)
1015 {
1016         int ret;
1017         va_list ap;
1018
1019         va_start(ap, fmt);
1020
1021         ret = vsnprintf(dst, size, fmt, ap);
1022         dst[size - 1] = '\0';
1023
1024         va_end(ap);
1025
1026         return ret;
1027 }
1028
1029 noinline void *xmemset(void *s, int c, size_t n)
1030 {
1031         size_t i;
1032         uint8_t *ptr = s;
1033
1034         for (i = 0; i < n; ++i)
1035                 ptr[i] = (uint8_t) c;
1036
1037         return ptr;
1038 }
1039
1040 char *getuint(char *in, uint32_t *out)
1041 {
1042         char *pt = in, tmp;
1043         char *endptr = NULL;
1044
1045         while (*in && (isdigit(*in) || isxdigit(*in) || *in == 'x'))
1046                 in++;
1047         if (!*in)
1048                 panic("Syntax error!\n");
1049         errno = 0;
1050         tmp = *in;
1051         *in = 0;
1052         *out = strtoul(pt, &endptr, 0);
1053         if ((endptr != NULL && *endptr != '\0') || errno != 0) {
1054                 panic("Syntax error!\n");
1055         }
1056         *in = tmp;
1057
1058         return in;
1059 }
1060
1061 char *strtrim_right(register char *p, register char c)
1062 {
1063         register char *end;
1064         register int len;
1065
1066         len = strlen(p);
1067         while (*p && len) {
1068                 end = p + len - 1;
1069                 if (c == *end)
1070                         *end = 0;
1071                 else
1072                         break;
1073                 len = strlen(p);
1074         }
1075
1076         return p;
1077 }
1078
1079 char *strtrim_left(register char *p, register char c)
1080 {
1081         register int len;
1082
1083         len = strlen(p);
1084         while (*p && len--) {
1085                 if (c == *p)
1086                         p++;
1087                 else
1088                         break;
1089         }
1090
1091         return p;
1092 }