1

unsquashfs -d rootfs_extracted rootfs

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外网/局域网访问 80/443 Web端口
        ↓
Web服务 (lighttpd / boa / thttpd)
        ↓
调用 CGI 脚本（.cgi / sh / lua）【第一层漏洞高发区】
        ↓
CGI 接收http参数，直接传给底层业务二进制
        ↓
/sbin /usr/sbin 二进制程序【第二层：溢出、命令拼接】
        ↓
system/popen/nvram_set 执行系统命令，最终root执行

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expl0rer@Legion-Ct:~/Desktop/IOT$ file rootfs_extracted/bin/boa
# 输出：rootfs_extracted/bin/boa: ELF 32-bit MSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), BuildID[sha1]=d471e811745cf21cd758f400bfc66acdd629ff3a, dynamically linked, interpreter /lib/ld-uClibc.so.0, no section header

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int __fastcall ftext(int argc, const char **argv, const char **envp)
{
  int pid; // $s3
  int v6; // $v0
  int v7; // $s0
  int g_language_state_prev; // $s0
  int n80; // $s0
  int opt; // $v0
  int v12; // $a0
  int v13; // $s2
  int v14; // $s1
  int max_connections; // $v0
  int v16; // $v0
  int v17; // $s0
  int *p_block_read_fdset; // $t8
  int *p_block_write_fdset; // $t8
  int v20; // $s1
  int n2; // $t8
  int v22; // $v0
  int v23; // $s4
  const char *p_echo_2____proc_lan_led_flag; // $a0
  _DWORD *wlan_idx_2; // $t8
  int *p_nds_2; // $a2
  int *p_nds_4_old_1; // $a1
  _DWORD *p_nds_3; // $v1
  int v29; // $s4
  int v30; // $v0
  int v31; // $s6
  const char *p_echo_0____proc_wlan0_led; // $a0
  const char *p_echo_0____tmp_button_status; // $a0
  const char *p_echo_1____proc_wlan0_led; // $a0
  int v35; // $s4
  int v36; // $v0
  int v37; // $s7
  int v38; // $v0
  const char *ethctl_gpio_38; // $a0
  int v40; // $v0
  int wlan_idx; // $s7
  int v42; // $s4
  int v43; // $v0
  int v44; // $s4
  int v45; // $v0
  int v46; // $s4
  int v47; // $a0
  int v48; // $v0
  int v49; // $s4
  int user_login_list_1; // $s4
  _DWORD *errlogin_list_1; // $s4
  int request_ready; // $t8
  int server_s; // $t8
  int server_s_1; // $a0
  int *request_block; // $t8
  int *p_req_timeout; // $t8
  int server_s_2; // $a1
  int server_s_3; // $a2
  int n4_1; // $t8
  BOOL v60; // $t8
  int v61; // $v0
  int n4; // $a0
  void (__fastcall *p_puts)(const char *); // $t9
  const char *p_presetflag.txt_NOT_exist; // $a0
  int v65; // $a0
  char v66[217]; // [sp+20h] [-2A0h] BYREF
  bool p_nds_4; // [sp+F9h] [-1C7h]
  _BYTE v68[64]; // [sp+208h] [-B8h] BYREF
  _DWORD v69[16]; // [sp+248h] [-78h] BYREF
  _DWORD v70[2]; // [sp+288h] [-38h] BYREF
  __int16 v71; // [sp+290h] [-30h]
  int n2_2; // [sp+294h] [-2Ch] BYREF
  int n2_1; // [sp+298h] [-28h] BYREF
  unsigned int n300; // [sp+29Ch] [-24h] BYREF
  int v75; // [sp+2A0h] [-20h] BYREF
  int n3; // [sp+2A4h] [-1Ch] BYREF
  int user_login_list; // [sp+2A8h] [-18h]
  _DWORD *errlogin_list; // [sp+2ACh] [-14h]
  int *p_nds_4_old; // [sp+2B0h] [-10h]
  int *p_nds_1; // [sp+2B4h] [-Ch]
  int *p_nds; // [sp+2B8h] [-8h]
  int wlan_idx_1; // [sp+2BCh] [-4h]

  n300 = 0;
  pthread_mutex_init(&mutex_lock_mesh, 0, envp);
  pthread_create(&thrd1_wifirestart_mesh, 0, mesh_restart_wifi, 0);
  boaASPInit(argc, argv);
  pid = getpid();
  ::pid = pid;
  v6 = fopen64("/var/run/boa.pid", "w");
  v7 = v6;
  if ( v6 )
  {
    fprintf(v6, "%d\n", pid);
    fclose(v7);
  }
  openlog("boa", 1, 0);
  v70[0] = 0;
  v70[1] = 0;
  v71 = 0;
  g_language_state_prev = 0;
  if ( !mib_get(285, v70) )
    return fputs("mib get multi-lingual setting (boa) failed!\n", stderr);
  while ( strcmp(v70, *(&off_51E014 + 2 * g_language_state_prev)) )
  {
    if ( ++g_language_state_prev == 3 )
    {
      fprintf(stderr, "Original [%s] is missing!! Switch to new default [%s].\n", (const char *)v70, "en");
      ::g_language_state_prev = 0;
      g_language_state = 0;
      goto LABEL_8;
    }
  }
  ::g_language_state_prev = g_language_state_prev;
  g_language_state = g_language_state_prev;
LABEL_8:
  strtbl = (int)off_51E304[(unsigned __int8)g_language_state];
  n80 = 80;
  while ( 1 )
  {
    opt = getopt(argc, argv, "p:vc:dns");
    if ( opt == -1 )
      break;
    if ( opt == 110 )
    {
      do_sock = 0;
    }
    else if ( opt >= 111 )
    {
      if ( opt == 115 )
      {
        do_ssl = 0;
      }
      else if ( opt == 118 )
      {
        verbose_logs = 1;
      }
      else
      {
        v12 = 1;
        if ( opt != 112 )
          goto LABEL_65;
        n80 = atoi(optarg);
      }
    }
    else if ( opt == 99 )
    {
      server_root = strdup(optarg);
    }
    else
    {
      if ( opt != 100 )
      {
        v12 = 1;
        goto LABEL_65;
      }
      do_fork = 0;
    }
  }
  fixup_server_root();
  v13 = fopen64("/var/boaSuper.passwd", "w+");
  v14 = fopen64("/var/boaUser.passwd", "w+");
  fclose(v13);
  fclose(v14);
  read_config_files();
  init_fm_apply_thread();
  if ( n80 != 80 )
    set_server_port(n80);
  create_common_env();
  sched_reboot_init_thread();
  if ( !do_ssl )
    goto LABEL_31;
  if ( InitSSLStuff() == 1 )
  {
LABEL_32:
    if ( do_sock )
    {
      ::server_s = socket(10, 2, 6);
      if ( ::server_s == -1 )
        die(3);
      if ( fcntl64(::server_s, 4, 128) == -1 )
        die(4);
      if ( fcntl64(::server_s, 2, 1) == -1 )
      {
        syslog(1, "%s, %i:Couldn't fcntl", "boa.c", 1357);
        die(4);
      }
      if ( setsockopt(::server_s, 0xFFFF, 4, &sock_opt, 4) == -1 )
        die(5);
      server_sockaddr = 10;
      memcpy(&unk_54E16C, &in6addr_any, 16);
      server_port_0 = server_port;
      if ( bind(::server_s, &server_sockaddr, 28) == -1 )
        die(6);
      max_connections = ::max_connections;
      if ( ::max_connections != -1 )
      {
        if ( ::max_connections >= backlog )
          max_connections = backlog;
        backlog = max_connections;
      }
      if ( listen(::server_s, backlog) == -1 )
        die(7);
      if ( server_s_0 < ::server_s )
        server_s_0 = ::server_s;
    }
    if ( init_captiveportal_socket() > 0 && server_s_0 < captiveportal_server_s )
      server_s_0 = captiveportal_server_s;
    g_max_upload_size = 31700000;
    v16 = fopen64("/proc/mtd", "r");
    v17 = v16;
    if ( v16 )
    {
      fgets(v66, 256, v16);
      do
      {
        if ( !fgets(v66, 256, v17) )
          goto LABEL_62;
        wlan_idx_1 = (int)v68;
        if ( sscanf(v66, "%*s%s%*s%s", v69, v68) != 2 )
        {
          puts("Unsuported MTD partition format");
          goto LABEL_62;
        }
      }
      while ( strcmp(wlan_idx_1, "\"rootfs\"") );
      g_max_upload_size = strtol(v69, 0, 16);
LABEL_62:
      fclose(v17);
    }
    else
    {
      puts("/proc/mtd not exists.");
    }
    init_signals();
    if ( fcntl64(::server_s, 2, 1) == -1 )
    {
      v12 = 0;
LABEL_65:
      exit(v12);
    }
    chroot_aliases();
    chroot_virtual_hosts();
    auth_check();
    server_gid = getgid();
    server_uid = getuid();
    writePasswdFile();
    timestamp();
    p_block_read_fdset = block_read_fdset;
    block_read_fdset[0] = 0;
    while ( ++p_block_read_fdset != &suStatus )
      *p_block_read_fdset = 0;
    p_block_write_fdset = &block_write_fdset;
    block_write_fdset = 0;
    while ( ++p_block_write_fdset != &status )
      *p_block_write_fdset = 0;
    dword_54E23C = 0;
    status = 0;
    dword_54E238 = 0;
    snprintf(v66, 50, "echo %d > /proc/dos_syslog", ::pid);
    system(v66);
    signal(16, &DoS_syslog);
    if ( is_defined(0) || is_defined(47) )
      system("echo 0 > /tmp/button_status");
    errlogin_list = 0;
    user_login_list = 0;
    v20 = 1;
    while ( 1 )
    {
      n2_1 = -1;
      if ( (!is_defined(0) || !is_defined(21)) && !is_defined(49) )
        goto LABEL_105;
      *(_DWORD *)v66 = 2;
      n2 = 2;
      if ( !start_flag )
      {
        v22 = fopen64("/proc/upgrade_status", "r");
        v23 = v22;
        if ( v22 )
        {
          fscanf(v22, "%u", v66);
          fclose(v23);
        }
        n2 = *(_DWORD *)v66;
        if ( *(_DWORD *)v66 != 1 )
          break;
      }
LABEL_103:
      if ( n2 == 1 )
        start_flag = 1;
LABEL_105:
      v29 = 0;
      if ( !sysinfo(v69) && v69[0] != dword_52B2E8 )
      {
        dword_52B2E8 = v69[0];
        v29 = 1;
      }
      calltimeout();
      if ( v29 )
      {
        if ( !is_defined(0) && !is_defined(47) )
        {
LABEL_149:
          wlan_idx = ::wlan_idx;
          v40 = fopen64("/proc/wlan_onoff", "r+");
          v42 = v40;
          if ( v40 )
          {
            fscanf(v40, "%d", &n2_1);
            if ( n2_1 == 1 )
            {
              ::wlan_idx = 0;
              wlan_idx_1 = 1;
              wlan_getEntry(v66, 0);
              p_nds_4 = !p_nds_4;
              p_nds = (int *)p_nds_4;
              wlan_setEntry(v66, 0);
              ::wlan_idx = wlan_idx_1;
              wlan_getEntry(v66, 0);
              p_nds_4 = (char)p_nds;
              wlan_setEntry(v66, 0);
              ::wlan_idx = wlan_idx;
              update_wps_configured(0);
              if ( !mib_update(8, 0) )
                puts("CS Flash error! ");
            }
            else if ( n2_1 != 2 )
            {
              goto LABEL_152;
            }
            config_WLAN(3);
            v68[0] = 48;
            fwrite(v68, 1, 1, v42);
LABEL_152:
            fclose(v42);
          }
          if ( getInFlags(WLANIF[0], 0) || getInFlags(WLANIF[1], 0) )
          {
            v43 = fopen64("/proc/gpio", "r+");
            v44 = v43;
            if ( v43 )
            {
              fscanf(v43, "%d", v66);
              if ( *(_DWORD *)v66 == 2 )
              {
                sync_wps_config_mib();
                puts("wps wlan restart");
                config_WLAN(3);
              }
              fclose(v44);
            }
          }
          v45 = fopen64("/proc/load_default", "r");
          v46 = v45;
          if ( v45 )
          {
            v47 = v45;
            if ( !v20 )
              goto LABEL_157;
            fscanf(v45, "%d", &n3);
            if ( (n3 & 0xFFFFFFFD) == 1
              && (system("echo 2 > /proc/load_default"), puts("Going to Reload Default"), Production_test_results() == 1) )
            {
              if ( n3 != 3 )
              {
                system("rm /var/config/presetflag.txt");
                p_puts = (void (__fastcall *)(const char *))&system;
                p_presetflag.txt_NOT_exist = "rm /var/config/logoflag.txt";
                goto LABEL_235;
              }
              v61 = access("/var/config/presetflag.txt", 0);
              p_puts = (void (__fastcall *)(const char *))&puts;
              if ( v61 )
              {
                p_presetflag.txt_NOT_exist = "presetflag.txt NOT exist";
LABEL_235:
                p_puts(p_presetflag.txt_NOT_exist);
                n4 = 4;
              }
              else
              {
                puts("presetflag.txt has exist");
                n4 = 6;
              }
              v20 = 0;
              reset_cs_to_default(n4);
              reset_hs_to_default(0);
              cmd_reboot();
            }
            else
            {
              v20 = 1;
            }
            v47 = v46;
LABEL_157:
            fclose(v47);
          }
          v48 = fopen64("/proc/load_reboot", "r");
          v49 = v48;
          if ( v48 )
          {
            v65 = v48;
            if ( v20 )
            {
              fscanf(v48, "%d", &v75);
              v20 = 1;
              if ( v75 == 1 )
              {
                v20 = 0;
                puts("Going to Reboot");
                cmd_reboot();
              }
              v65 = v49;
            }
            fclose(v65);
          }
          goto LABEL_159;
        }
        n2_2 = -1;
        memset(v68, 0, sizeof(v68));
        v30 = fopen64("/proc/led_key_node", "r+");
        v31 = v30;
        if ( !v30 )
        {
          puts("Can't open /proc/led_key_node \r");
          goto LABEL_149;
        }
        fscanf(v30, "%d", &n2_2);
        if ( n2_2 == 1 )
        {
          if ( is_defined(0) )
          {
            system("echo 0 > /proc/wlan0/led");
            p_echo_0____proc_wlan0_led = "echo 0 > /proc/wlan1/led";
            goto LABEL_119;
          }
          if ( is_defined(47) )
          {
            p_echo_0____proc_wlan0_led = "echo 0 > /proc/wlan0/led";
LABEL_119:
            system(p_echo_0____proc_wlan0_led);
          }
          system("echo 1 > /tmp/button_status");
          p_echo_0____tmp_button_status = "ethctl gpio 38 1";
LABEL_147:
          system(p_echo_0____tmp_button_status);
LABEL_148:
          system("echo 0 > /proc/led_key_node");
          fclose(v31);
          goto LABEL_149;
        }
        if ( n2_2 != 2 )
          goto LABEL_148;
        if ( is_defined(0) || is_defined(47) )
          system("touch /tmp/wifi_status");
        if ( is_defined(0) )
        {
          system("flash get WLAN_MBSSIB_TBL.0.wlanDisabled > /tmp/wifi_status");
          get_wifi_current_status(v68);
          if ( !strcasecmp(v68, "0") )
            system("echo 1 > /proc/wlan0/led");
          system("flash get WLAN1_MBSSIB_TBL.0.wlanDisabled > /tmp/wifi_status");
          get_wifi_current_status(v68);
          if ( !strcasecmp(v68, "0") )
          {
            p_echo_1____proc_wlan0_led = "echo 1 > /proc/wlan1/led";
            goto LABEL_133;
          }
        }
        else if ( is_defined(47) )
        {
          system("flash get WLAN_MBSSIB_TBL.0.wlanDisabled > /tmp/wifi_status");
          get_wifi_current_status(v68);
          if ( !strcasecmp(v68, "0") )
          {
            p_echo_1____proc_wlan0_led = "echo 1 > /proc/wlan0/led";
LABEL_133:
            system(p_echo_1____proc_wlan0_led);
          }
        }
        memset(v66, 0, 128);
        v35 = fopen64("/tmp/voipstatus", "r");
        if ( !v35 )
        {
          puts("file open failed");
          goto LABEL_142;
        }
        memset(v66, 0, 128);
        v36 = fread(v66, 1, 128, v35);
        v37 = v36;
        if ( v36 && (printf("read size=%d, buffer=%s\n", v36, v66), v37 < 0) )
        {
          fclose(v35);
LABEL_142:
          v38 = -1;
        }
        else if ( strcmp(v66, "10000000") )
        {
          v38 = strcmp(v66, "31000000") == 0;
        }
        else
        {
          v38 = 1;
        }
        if ( v38 == 1 )
          ethctl_gpio_38 = "ethctl gpio 38 0 ";
        else
          ethctl_gpio_38 = "ethctl gpio 38 1";
        system(ethctl_gpio_38);
        p_echo_0____tmp_button_status = "echo 0 > /tmp/button_status";
        goto LABEL_147;
      }
LABEL_159:
      if ( !dword_52B2E4 )
        syslog(6, "DSL Link up");
      dword_52B2E4 = 1;
      if ( !mib_get(380, &n300) )
      {
        puts("get auto logout time failed, use 300s as default!");
        n300 = 300;
      }
      for ( user_login_list_1 = ::user_login_list; user_login_list_1; user_login_list_1 = *(_DWORD *)(user_login_list_1 + 4) )
      {
        if ( n300 < time_counter - *(_DWORD *)(user_login_list_1 + 12) )
          ulist_free_login_entry(user_login_list, user_login_list_1);
        user_login_list = user_login_list_1;
      }
      for ( errlogin_list_1 = (_DWORD *)::errlogin_list; errlogin_list_1; errlogin_list_1 = (_DWORD *)*errlogin_list_1 )
      {
        if ( time_counter - errlogin_list_1[2] >= 61 )
          ulist_free_errlog_entry(errlogin_list, errlogin_list_1);
        errlogin_list = errlogin_list_1;
      }
      if ( sighup_flag )
        sighup_run();
      if ( sigchld_flag )
        sigchld_run();
      if ( lame_duck_mode == 1 )
      {
        lame_duck_mode_run(::server_s);
        request_ready = ::request_ready;
      }
      else
      {
        if ( lame_duck_mode != 2 )
          goto LABEL_185;
        request_ready = ::request_ready;
      }
      if ( !request_ready && !::request_block )
        die(15);
LABEL_185:
      fdset_update();
      if ( ::request_ready )
        goto LABEL_217;
      server_s = ::server_s;
      if ( ::server_s < captiveportal_server_s )
        server_s = captiveportal_server_s;
      if ( server_s < 0 )
        server_s = 0;
      block_read_fdset[(unsigned int)captiveportal_server_s >> 5] |= 1 << captiveportal_server_s;
      server_s_0 = server_s;
      if ( do_sock < 2 )
      {
        if ( server_s < server_ssl )
          server_s = server_ssl;
        server_s_0 = server_s;
      }
      server_s_1 = server_s_0;
      request_block = (int *)::request_block;
      while ( request_block )
      {
        server_s_2 = request_block[4];
        if ( server_s_2 < *request_block )
          server_s_2 = *request_block;
        server_s_3 = request_block[40];
        request_block = (int *)request_block[52];
        if ( server_s_2 < server_s_3 )
          server_s_2 = server_s_3;
        if ( server_s_2 >= server_s_1 )
          server_s_1 = server_s_2;
      }
      p_req_timeout = &req_timeout;
      if ( !::request_block )
        p_req_timeout = 0;
      server_s_0 = server_s_1;
      if ( select(server_s_1 + 1, block_read_fdset, &block_write_fdset, 0, p_req_timeout) == -1 )
      {
        n4_1 = *(_DWORD *)_errno_location();
        if ( n4_1 != 4 && n4_1 != 9 )
          die(11);
      }
      else
      {
        v60 = do_sock < 2;
        if ( do_sock )
        {
          if ( ((block_read_fdset[(unsigned int)::server_s >> 5] >> ::server_s) & 1) != 0 )
            get_request();
          v60 = do_sock < 2;
        }
        if ( v60 && ((block_read_fdset[(unsigned int)server_ssl >> 5] >> server_ssl) & 1) != 0 )
          get_ssl_request();
LABEL_217:
        process_requests();
      }
    }
    if ( get_lan_port_status() != 1 )
    {
      system("echo 0 > /proc/lan_led_flag");
      goto LABEL_102;
    }
    get_net_device_stats("eth0.2", &nds_2);
    get_net_device_stats("eth0.3", &nds_3);
    if ( dword_52B1D4 == dword_52B230 && nds_2_old == nds_2 && dword_52B11C == dword_52B178 && nds_3_old == nds_3 )
    {
      if ( is_defined(49) )
      {
        get_net_device_stats("eth0.4", &nds_4);
        get_net_device_stats("eth0.5", &nds_5);
        if ( dword_52B064 == dword_52B0C0 && nds_4_old == nds_4 && dword_52AFAC == dword_52B008 && nds_5_old == nds_5 )
        {
          p_nds = &nds_5;
          p_nds_4_old = &nds_4_old;
          p_nds_1 = &nds_4;
          wlan_idx_1 = (int)&nds_5_old;
          system("echo 1 > /proc/lan_led_flag");
          wlan_idx_2 = (_DWORD *)wlan_idx_1;
          p_nds_2 = p_nds_1;
          p_nds_4_old_1 = p_nds_4_old;
          p_nds_3 = p_nds;
        }
        else
        {
          p_nds = &nds_5;
          p_nds_4_old = &nds_4_old;
          p_nds_1 = &nds_4;
          wlan_idx_1 = (int)&nds_5_old;
          system("echo 2 > /proc/lan_led_flag");
          p_nds_3 = p_nds;
          p_nds_4_old_1 = p_nds_4_old;
          p_nds_2 = p_nds_1;
          wlan_idx_2 = (_DWORD *)wlan_idx_1;
        }
        p_nds_4_old_1[1] = p_nds_2[1];
        *p_nds_4_old_1 = *p_nds_2;
        wlan_idx_2[1] = p_nds_3[1];
        *wlan_idx_2 = *p_nds_3;
        goto LABEL_100;
      }
      p_echo_2____proc_lan_led_flag = "echo 1 > /proc/lan_led_flag";
    }
    else
    {
      p_echo_2____proc_lan_led_flag = "echo 2 > /proc/lan_led_flag";
    }
    system(p_echo_2____proc_lan_led_flag);
LABEL_100:
    dword_52B1D4 = dword_52B230;
    nds_2_old = nds_2;
    dword_52B11C = dword_52B178;
    nds_3_old = nds_3;
LABEL_102:
    n2 = *(_DWORD *)v66;
    goto LABEL_103;
  }
  syslog(1, "Failure initialising SSL support - ");
  if ( do_sock )
  {
    syslog(1, "    supporting normal (unencrypted) sockets only");
    fflush(0);
LABEL_31:
    do_sock = 2;
    goto LABEL_32;
  }
  syslog(1, "    normal sockets disabled, so exiting");
  fflush(0);
  return 0;
}

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// 如果开启普通http socket服务
if (do_sock != 0)
{
    // 如果监听socket有新连接到达
    if (FD_ISSET(server_s, &block_read_fdset))
    {
        get_request();   // accept接收新连接 + 可能是read读http数据！
    }
    v60 = (do_sock < 2); //标记是否还要处理ssl套接字
}

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select() 监控 server_s 这个 socket
  ↓ 有数据可读
get_request()      ← HTTP 请求处理
get_ssl_request()  ← HTTPS 请求处理

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        if ( v60 && ((block_read_fdset[(unsigned int)server_ssl >> 5] >> server_ssl) & 1) != 0 )
          get_ssl_request();

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select返回，有socket事件
├─ if(do_sock) {
│    如果80端口listen fd就绪 → get_request() // http新连接
│    v60 = do_sock < 2;  // 计算是否允许处理ssl
│ }
├─ if(v60 && 443 listen fd就绪) → get_ssl_request() // https新连接
└─ process_requests() // http/https统一读取http数据、解析

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int __fastcall read_header(int a1)
{
  int v2; // $s3
  int v3; // $s6
  int v4; // $a2
  _BYTE *v5; // $s1
  int v6; // $a0
  int v7; // $v0
  int n4; // $v0
  int result; // $v0
  _BYTE *v10; // $s0
  int v11; // $s2
  _BYTE *v12; // $s4
  int v13; // $v0
  int n2; // $v0
  char n2_2; // $a0
  int n13_1; // $a1
  int n10_1; // $v0
  bool v18; // dc
  int n13; // $v0
  int n10; // $a0
  __int16 v21; // $v0
  __int16 v22; // $v0
  char n2_1; // $a0
  __int16 v24; // $v0
  unsigned int n0x20000000; // $v0
  int v26; // $v0
  int n13_2; // $a1
  int v28; // $s1
  int v29; // $a0
  unsigned int g_filesize; // $a3
  int v31; // $a0
  unsigned int v32; // $v0
  int v33; // $v1
  unsigned int n0x1000; // $v0

  v2 = 1;
  v3 = *(_DWORD *)(a1 + 48);
  while ( 2 )
  {
    if ( v3 )
    {
      v5 = (_BYTE *)(a1 + 1273);
      *(_DWORD *)(a1 + 44) = v3;
      *(_DWORD *)(a1 + 48) = 0;
    }
    else
    {
      v4 = *(_DWORD *)(a1 + 44);
      v5 = (_BYTE *)(a1 + v4 + 1273);
      if ( 4096 - v4 < 0 )
      {
        syslog(3, "buffer overrun in read_header1 - closing");
        return 0;
      }
      v6 = *(_DWORD *)(a1 + 216);
      if ( v6 )
        v7 = SSL_read(v6, v5);
      else
        v7 = ((int (__fastcall *)(_DWORD, _BYTE *))read)(*(_DWORD *)a1, v5);
      v3 = v7;
      if ( v7 == -1 )
      {
        n4 = *(_DWORD *)_errno_location();
        if ( n4 == 4 )
          return 1;
        if ( n4 == 11 )
          return -1;
        if ( n4 != 9 && n4 != 32 )
          return 0;
        *(_WORD *)(a1 + 8) = *(_WORD *)(a1 + 8) & 0xFC7F | 0x80;
        return 0;
      }
      if ( !v7 )
        return 0;
      *(_DWORD *)(a1 + 44) += v7;
    }
    v10 = v5;
    v11 = 0;
    while ( 1 )
    {
      v12 = &v5[v3];
      v13 = *(_DWORD *)(a1 + 8);
      if ( v10 >= &v5[v3] )
        break;
      n2 = v13 >> 27;
      n2_2 = 1;
      n13_1 = n2 < 2;
      if ( n2 == 1 )
      {
        v22 = *(_WORD *)(a1 + 8);
        if ( *v10 == 10 )
        {
          n2_1 = 2;
          goto LABEL_46;
        }
        goto LABEL_40;
      }
      if ( n2 >= 2 )
      {
        if ( n2 == 2 )
        {
          n13 = (char)*v10;
          if ( n13 == 13 )
          {
            v22 = *(_WORD *)(a1 + 8);
            n2_1 = 3;
            goto LABEL_46;
          }
          n10 = 10;
LABEL_44:
          v18 = n13 != n10;
          v22 = *(_WORD *)(a1 + 8);
          if ( !v18 )
          {
            n2_1 = 4;
LABEL_46:
            v24 = v22 & 0x7FF | ((n2_1 & 0x1F) << 11);
LABEL_47:
            *(_WORD *)(a1 + 8) = v24;
            goto LABEL_48;
          }
LABEL_40:
          v24 = v22 & 0x7FF;
          goto LABEL_47;
        }
        v18 = n2 != 3;
        n13 = 10;
        if ( !v18 )
        {
          n10 = (char)*v10;
          goto LABEL_44;
        }
      }
      else if ( !n2 )
      {
        n10_1 = (char)*v10;
        n13_1 = 13;
        if ( n10_1 == 13 )
        {
          v21 = *(_WORD *)(a1 + 8);
        }
        else
        {
          n2_2 = 2;
          if ( n10_1 != 10 )
          {
            if ( v10 == v5 + 4095 )
            {
              *(_WORD *)(a1 + 8) = *(_WORD *)(a1 + 8) & 0x7FF | 0x1000;
              *(_DWORD *)(a1 + 56) = v10;
              printf("%s:%d header end!\n", "read_header", 367);
            }
            goto LABEL_48;
          }
          v21 = *(_WORD *)(a1 + 8);
        }
        *(_WORD *)(a1 + 8) = v21 & 0x7FF | ((n2_2 & 0x1F) << 11);
        *(_DWORD *)(a1 + 56) = v10;
      }
LABEL_48:
      if ( v2 )
        DebugSaveWebReqInfo(a1, v10);
      n0x20000000 = *(_DWORD *)(a1 + 8) & 0xF8000000;
      ++v10;
      if ( n0x20000000 == 0x10000000 )
      {
        **(_BYTE **)(a1 + 56) = 0;
        if ( *(_DWORD *)(a1 + 40) )
        {
          v26 = process_option_line(a1, n13_1);
          v3 -= v26;
          v10 -= v26;
          if ( v26 )
            v11 = 1;
          *(_DWORD *)(a1 + 52) = v10;
        }
        else
        {
          if ( !process_logline(a1, n13_1) )
            return 0;
          if ( ((*(_DWORD *)(a1 + 8) >> 26) & 1) != 0 )
            return process_header_end(a1, n13_2);
          *(_DWORD *)(a1 + 52) = v10;
        }
        v2 = 0;
      }
      else
      {
        v2 = 0;
        if ( n0x20000000 == 0x20000000 )
        {
          v28 = process_header_end(a1, n13_1);
          *(_DWORD *)(a1 + 48) = &v10[-a1 - 1273];
          if ( !v28 )
            return 0;
          result = v28;
          if ( *(_DWORD *)(a1 + 36) == 4 )
          {
            v29 = *(_DWORD *)(a1 + 192);
            if ( v29 )
            {
              g_filesize = atoi(v29);
              *(_DWORD *)(a1 + 20) = g_filesize;
              ::g_filesize = g_filesize;
              if ( g_filesize >= 0x1300001 )
              {
                printf(
                  "%s:%d req->filesize: %d > MAX_UPLOAD_FILESIZE: %d... reboot\n\n",
                  "read_header",
                  450,
                  g_filesize,
                  19922944);
                cmd_reboot();
              }
              if ( *(_DWORD *)(a1 + 20) >= 0xF4241u )
                cmd_killproc(-393225);
              if ( !is_defined(21) )
              {
                printf("%s:%d drop vm cache...\n\n", "read_header", 466);
                system("sync;echo 3 > /proc/sys/vm/drop_caches");
              }
            }
            v31 = *(_DWORD *)(a1 + 244);
            *(_DWORD *)(a1 + 24) = v12 - v10;
            memcpy(v31, v10, v12 - v10);
            v32 = *(_DWORD *)(a1 + 24);
            v33 = *(_DWORD *)(a1 + 244);
            *(_DWORD *)(a1 + 52) = v33;
            *(_DWORD *)(a1 + 56) = v33 + v32;
            v18 = v32 < *(_DWORD *)(a1 + 20);
            result = v28;
            if ( !v18 )
              *(_DWORD *)(a1 + 144) = 2;
          }
          return result;
        }
      }
    }
    if ( (v13 & 0xF8000000) == 0 && request_type(a1) == -1 )
    {
LABEL_82:
      syslog(3, "malformed request: \"%s\"\n", *(const char **)(a1 + 40));
      send_r_bad_request(a1);
      return 0;
    }
    if ( v11 )
    {
      v3 = *(_DWORD *)(a1 + 48);
      continue;
    }
    break;
  }
  result = 1;
  if ( (*(_DWORD *)(a1 + 8) & 0xF8000000) == 0 )
  {
    n0x1000 = strlen(v5);
    if ( n0x1000 >= 0x1000 )
    {
      printf("%s:%d buffer overflow %d\n", "read_header", 507, n0x1000);
      syslog(3, "buffer overflow\n");
      ((void (__fastcall *)(int))send_r_entity_too_large)(a1);
      return 0;
    }
    if ( !*v5 )
      return 1;
    goto LABEL_82;
  }
  return result;
}

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process_requests()
  → read_header()
      → read()
      → 解析 HTTP 头
      → process_header_end()
          → POST：进入 read_body()
          → GET：进入后续 GET 处理

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int __fastcall process_header_end(int request_ready, int n13)
{
  int request_ready_1; // $s0
  int result; // $v0
  int v4; // $v0
  BOOL v5; // $s2
  int v6; // $s3
  int n4; // $v0
  int v8; // $v0
  bool v9; // dc
  char _tmp_rtktmpXXXXXX_[144]; // [sp+18h] [-9Ch] BYREF

  request_ready_1 = request_ready;
  if ( !*(_DWORD *)(request_ready + 40) )
    goto LABEL_9;
  if ( *(_DWORD *)(request_ready + 200) )
    log_user_agent();
  result = translate_uri(request_ready_1, n13);
  if ( !result )
  {
    *(_WORD *)(request_ready_1 + 8) = *(_WORD *)(request_ready_1 + 8) & 0xFC7F | 0x80;
    return result;
  }
  if ( *(_DWORD *)(request_ready_1 + 236) == 1 )
  {
    v4 = mib_get(167, _tmp_rtktmpXXXXXX_);
    request_ready = request_ready_1;
    if ( v4 )
    {
      send_redirect_temp(request_ready_1, _tmp_rtktmpXXXXXX_);
      return 0;
    }
LABEL_9:
    send_r_error(request_ready);
    return 0;
  }
  v5 = 1;
  if ( strncmp(request_ready_1 + 248, "/goform/ate", 11) )
    v5 = strncmp(request_ready_1 + 248, "/goform/factory", 15) == 0;
  v6 = strstr(request_ready_1 + 248, "/multiUserLogin");
  if ( !strstr(request_ready_1 + 248, "/formMultiUserLogin") )
  {
    if ( v6 )
    {
      n4 = *(_DWORD *)(request_ready_1 + 36);
      goto LABEL_21;
    }
    if ( v5 )
    {
      n4 = *(_DWORD *)(request_ready_1 + 36);
      goto LABEL_21;
    }
    closelog();
    openlog("boa", 1, 80);
    if ( !auth_authorize(request_ready_1) )
    {
      openlog("boa", 1, 0);
      return 0;
    }
  }
  n4 = *(_DWORD *)(request_ready_1 + 36);
LABEL_21:
  if ( n4 == 4 )
  {
    strcpy(_tmp_rtktmpXXXXXX_, "/tmp/rtktmpXXXXXX");
    v8 = mkstemp64(_tmp_rtktmpXXXXXX_);
    *(_DWORD *)(request_ready_1 + 160) = v8;
    v9 = v8 == -1;
    result = 0;
    if ( !v9 )
    {
      *(_DWORD *)(request_ready_1 + 164) = strdup(_tmp_rtktmpXXXXXX_);
      return 1;
    }
  }
  else if ( *(_DWORD *)(request_ready_1 + 148) )
  {
    return init_get2(request_ready_1);
  }
  else
  {
    *(_WORD *)(request_ready_1 + 8) = *(_WORD *)(request_ready_1 + 8) & 0x7FF | 0x3000;
    return ((int (__fastcall *)(_DWORD))init_get)(request_ready_1);
  }
  return result;
}