undefined4 FUN_0040249c(int param_1)

{

  byte bVar1;

  ushort uVar2;

  uint uVar3;

  char *pcVar4;

  int iVar5;

  undefined4 uVar6;

  int iVar7;

  uint uVar8;

  uint uVar9;

  in_addr iVar10;

  in_addr iVar11;

  byte *pbVar12;

  byte *pbVar13;

  code *pcVar14;

  socklen_t local_480;

  sockaddr sStack_47c;

  char acStack_46c [32];

  char acStack_44c [32];

  undefined4 local_42c;

  undefined4 uStack_428;

  char local_423;

  byte local_422;

  in_addr local_420;

  in_addr local_41c;

  local_480 = 0x10;

  uVar3 = recvfrom(param_1,&local_42c,0x400,0,&sStack_47c,&local_480)   //possible issue identified - semgrep

  iVar11.s_addr = local_41c.s_addr;

  iVar10.s_addr = local_420.s_addr;

  if ((int)uVar3 < 1) {

    return 0;

  }

  pcVar4 = inet_ntoa(local_420);

  strcpy(acStack_46c,pcVar4)   //possible issue identified - semgrep

  pcVar4 = inet_ntoa(local_41c);

  strcpy(acStack_44c,pcVar4)   //possible issue identified - semgrep

  if (local_423 == '\0') {

    iVar5 = vifs_is_upstream(local_422);

    if (iVar5 == 0) {

      return 0;

    }

    uVar3 = (uint)local_422;

    pcVar14 = mrt_activate_route;

    iVar10.s_addr = local_420.s_addr;

    iVar11.s_addr = local_41c.s_addr;

LAB_0040275c:

    (*pcVar14)(iVar10.s_addr,iVar11.s_addr,uVar3);

  }

  else {

    uVar9 = local_42c & 0xf;

    uVar8 = (local_42c._2_2_ & 0xff) << 8 | (uint)(local_42c._2_2_ >> 8);

    iVar5 = uVar8 + uVar9 * -4;

    if (uVar8 != uVar3) {

      return 0;

    }

    pbVar13 = (byte *)(&local_42c + uVar9);

    uVar3 = (&uStack_428)[uVar9];

    if (iVar5 < 8) {

      return 0;

    }

    uVar6 = vifs_find_by_ip(iVar10.s_addr,0,0);

    verbose("%s: type=0x%x, vifi=%d, src=%s, dst=%s\n","igmp_read",*pbVar13,uVar6,acStack_46c,

            acStack_44c);

    bVar1 = *pbVar13;

    if (bVar1 != 0x16) {

      if (0x16 < bVar1) {

        if (bVar1 == 0x17) {

          iVar5 = FUN_00402354(uVar3);

          if (iVar5 != 0) {

            return 0;

          }

          vifs_update_igmp_ver(iVar10.s_addr,0,1,0x16);

          mrt_leave_group(iVar10.s_addr,iVar11.s_addr,uVar3,&local_42c);

          return 0;

        }

        uVar3 = 0;

        if (bVar1 != 0x22) {

          return 0;

        }

        uVar2 = *(ushort *)((int)&uStack_428 + uVar9 * 4 + 2);

        do {

          iVar5 = uVar3 + 1;

          if (((uVar2 & 0xff) << 8 | (uint)(uVar2 >> 8)) <= uVar3) {

            return 0;

          }

          pbVar12 = pbVar13 + iVar5 * 8;

          iVar7 = FUN_00402354(*(undefined4 *)(pbVar12 + 4));

          if (iVar7 != 0) goto switchD_004027e0_default;

          switch(*pbVar12 - 1) {

          case 0:

          case 2:

            if (*(short *)(pbVar12 + 2) == 0) goto switchD_004027e0_caseD_5;

            break;

          case 1:

          case 3:

            if (*(short *)(pbVar12 + 2) != 0) goto switchD_004027e0_caseD_5;

            break;

          case 4:

            break;

          case 5:

switchD_004027e0_caseD_5:

            mrt_leave_group(iVar10.s_addr,iVar11.s_addr,*(undefined4 *)(pbVar13 + iVar5 * 8 + 4),

                            &local_42c);

          default:

            goto switchD_004027e0_default;

          }

          mrt_membership_report

                    (iVar10.s_addr,iVar11.s_addr,*(undefined4 *)(pbVar13 + iVar5 * 8 + 4),*pbVar13,

                     &local_42c);

switchD_004027e0_default:

          uVar3 = uVar3 + 1 & 0xffff;

        } while( true );

      }

      if (bVar1 == 0x11) {

        iVar7 = FUN_00402354(uVar3);

        if (iVar7 != 0) {

          return 0;

        }

        if (iVar5 == 8) {

          vifs_update_igmp_ver_all(1,0x16);

        }

        pcVar14 = mrt_membership_query;

        goto LAB_0040275c;

      }

      if (bVar1 != 0x12) {

        return 0;

      }

    }

    iVar5 = FUN_00402354(uVar3);

    if (iVar5 == 0) {

      vifs_update_igmp_ver(iVar10.s_addr,0,1,0x16);

      mrt_membership_report(iVar10.s_addr,iVar11.s_addr,uVar3,*pbVar13,&local_42c);

    }

  }

  return 0;

}