[c117a28] | 1 | /* |
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| 2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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| 3 | * |
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| 4 | * embedded brains GmbH |
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| 5 | * Dornierstr. 4 |
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| 6 | * 82178 Puchheim |
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| 7 | * Germany |
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| 8 | * <rtems@embedded-brains.de> |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * 1. Redistributions of source code must retain the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer. |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in the |
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| 17 | * documentation and/or other materials provided with the distribution. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 29 | * SUCH DAMAGE. |
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| 30 | */ |
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| 31 | |
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[2d1da0d] | 32 | #include <assert.h> |
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| 33 | #include <fcntl.h> |
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| 34 | #include <stdio.h> |
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[c117a28] | 35 | #include <stdlib.h> |
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[2d1da0d] | 36 | #include <sys/stat.h> |
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| 37 | #include <sys/socket.h> |
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| 38 | #include <netinet/in.h> |
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| 39 | #include <netinet/tcp.h> |
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| 40 | #include <netdb.h> |
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| 41 | #include <unistd.h> |
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| 42 | #include <errno.h> |
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| 43 | |
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| 44 | #include <machine/rtems-bsd-commands.h> |
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| 45 | |
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| 46 | #include <rtems/libcsupport.h> |
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| 47 | #include <rtems/shell.h> |
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| 48 | #include <rtems/telnetd.h> |
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| 49 | #include <rtems/ftpd.h> |
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[c117a28] | 50 | |
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| 51 | #define TEST_NAME "LIBBSD PF 1" |
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| 52 | |
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[2d1da0d] | 53 | #define ARGC(x) RTEMS_BSD_ARGC(x) |
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| 54 | |
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| 55 | #define LO1_IP "172.21.1.1" |
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| 56 | #define LO2_IP "172.22.2.2" |
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| 57 | #define TELNET_PORT 23 |
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| 58 | #define FTP_PORT 21 |
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| 59 | |
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| 60 | #define SERVER_TASK_PRIO 110 |
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| 61 | |
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| 62 | /* |
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| 63 | * WARNING: The following rules are not made to be an good example for using PF. |
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| 64 | * Check the online manuals for PF to find out how to write good rules. |
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| 65 | */ |
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| 66 | |
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| 67 | /* Config with invalid syntax */ |
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| 68 | #define TEST_CFG_INVALID "/etc/pf_invalid.conf" |
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| 69 | #define TEST_CFG_INVALID_CONTENT \ |
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| 70 | "some\n" \ |
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| 71 | "garbage\n" |
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| 72 | |
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| 73 | /* Allow only some services on output. */ |
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| 74 | #define TEST_CFG_BLOCK_MOST "/etc/pf_block_most.conf" |
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| 75 | #define TEST_CFG_BLOCK_MOST_CONTENT \ |
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| 76 | "tcp_services = \"{ ssh, telnet, www }\"\n" \ |
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| 77 | "udp_services = \"{ telnet }\"\n" \ |
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| 78 | "block all\n" \ |
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| 79 | "pass out proto tcp to any port $tcp_services keep state\n" \ |
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| 80 | "pass proto udp to any port $udp_services keep state\n" |
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| 81 | |
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| 82 | /* Allow all on one and only some on another interface. */ |
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| 83 | #define TEST_CFG_IF_DEPEND "/etc/pf_if_depend.conf" |
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| 84 | #define TEST_CFG_IF_DEPEND_CONTENT \ |
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| 85 | "ext_if = \"cgem0\"\n" \ |
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| 86 | "int_if = \"lo0\"\n" \ |
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| 87 | "block in all\n" \ |
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| 88 | "pass in on $int_if all\n" \ |
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| 89 | "pass in on $ext_if inet proto { tcp, udp } from any port { telnet }\n" |
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| 90 | |
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| 91 | /* Block all input except on lo1. */ |
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| 92 | #define TEST_CFG_ALLOW_LO1 "/etc/pf_allow_lo1.conf" |
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| 93 | #define TEST_CFG_ALLOW_LO1_CONTENT \ |
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| 94 | "block all\n" \ |
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| 95 | "pass in on lo1 all keep state\n" \ |
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| 96 | "pass out all\n" |
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| 97 | |
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| 98 | /* Block all input except telnet on lo1. */ |
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| 99 | #define TEST_CFG_TELNET_LO1 "/etc/pf_allow_telnet_lo1.conf" |
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| 100 | #define TEST_CFG_TELNET_LO1_CONTENT \ |
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| 101 | "block all\n" \ |
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| 102 | "pass in on lo1 inet proto { tcp } from any to any port { telnet } keep state\n" \ |
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| 103 | "pass out all\n" |
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| 104 | |
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| 105 | /* pf.os */ |
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| 106 | #define ETC_PF_OS "/etc/pf.os" |
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| 107 | #define ETC_PF_OS_CONTENT "# empty" |
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| 108 | |
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| 109 | /* protocols */ |
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| 110 | #define ETC_PROTOCOLS "/etc/protocols" |
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| 111 | #define ETC_PROTOCOLS_CONTENT \ |
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| 112 | "ip 0 IP # internet protocol, pseudo protocol number\n" \ |
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| 113 | "tcp 6 TCP # transmission control protocol\n" \ |
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| 114 | "udp 17 UDP # user datagram protocol\n" |
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| 115 | |
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| 116 | /* services */ |
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| 117 | #define ETC_SERVICES "/etc/services" |
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| 118 | #define ETC_SERVICES_CONTENT \ |
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| 119 | "ftp-data 20/sctp #File Transfer [Default Data]\n" \ |
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| 120 | "ftp-data 20/tcp #File Transfer [Default Data]\n" \ |
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| 121 | "ftp-data 20/udp #File Transfer [Default Data]\n" \ |
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| 122 | "ftp 21/sctp #File Transfer [Control]\n" \ |
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| 123 | "ftp 21/tcp #File Transfer [Control]\n" \ |
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| 124 | "ftp 21/udp #File Transfer [Control]\n" \ |
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| 125 | "ssh 22/tcp #Secure Shell Login\n" \ |
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| 126 | "telnet 23/tcp\n" \ |
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| 127 | "telnet 23/udp\n" \ |
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| 128 | "http 80/tcp www www-http #World Wide Web HTTP\n" |
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| 129 | |
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| 130 | static const struct { |
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| 131 | const char *name; |
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| 132 | const char *content; |
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| 133 | } init_files[] = { |
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| 134 | {.name = ETC_PF_OS, .content = ETC_PF_OS_CONTENT}, |
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| 135 | {.name = ETC_PROTOCOLS, .content = ETC_PROTOCOLS_CONTENT}, |
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| 136 | {.name = ETC_SERVICES, .content = ETC_SERVICES_CONTENT}, |
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| 137 | {.name = TEST_CFG_INVALID, .content = TEST_CFG_INVALID_CONTENT}, |
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| 138 | {.name = TEST_CFG_BLOCK_MOST, .content = TEST_CFG_BLOCK_MOST_CONTENT}, |
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| 139 | {.name = TEST_CFG_IF_DEPEND, .content = TEST_CFG_IF_DEPEND_CONTENT}, |
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| 140 | {.name = TEST_CFG_ALLOW_LO1, .content = TEST_CFG_ALLOW_LO1_CONTENT}, |
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| 141 | {.name = TEST_CFG_TELNET_LO1, .content = TEST_CFG_TELNET_LO1_CONTENT}, |
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| 142 | }; |
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| 143 | |
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| 144 | /* Create all necessary files */ |
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| 145 | static void |
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| 146 | prepare_files() |
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| 147 | { |
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| 148 | size_t i; |
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| 149 | struct stat sb; |
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| 150 | int rv; |
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| 151 | int fd; |
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| 152 | size_t written; |
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| 153 | |
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| 154 | /* Create /etc if necessary */ |
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| 155 | rv = mkdir("/etc", S_IRWXU | S_IRWXG | S_IRWXO); |
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| 156 | /* ignore errors, check the dir after. */ |
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| 157 | assert(stat("/etc", &sb) == 0); |
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| 158 | assert(S_ISDIR(sb.st_mode)); |
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| 159 | |
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| 160 | /* Create files */ |
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| 161 | for(i = 0; i < (sizeof(init_files)/sizeof(init_files[0])); ++i) { |
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| 162 | const char *content; |
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| 163 | size_t len; |
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| 164 | |
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| 165 | content = init_files[i].content; |
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| 166 | len = strlen(content); |
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| 167 | |
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| 168 | fd = open(init_files[i].name, O_WRONLY | O_CREAT, |
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| 169 | S_IRWXU | S_IRWXG | S_IRWXO); |
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| 170 | assert(fd != -1); |
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| 171 | |
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| 172 | written = write(fd, content, len); |
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| 173 | assert(written == len); |
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| 174 | |
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| 175 | rv = close(fd); |
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| 176 | assert(rv == 0); |
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| 177 | } |
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| 178 | } |
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| 179 | |
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| 180 | /* Generic server task */ |
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| 181 | static rtems_task |
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| 182 | tcp_server_task(rtems_task_argument arg) |
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| 183 | { |
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| 184 | int sd, client; |
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| 185 | socklen_t addrlen; |
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| 186 | struct sockaddr_in addr, client_addr; |
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| 187 | uint16_t port = arg; |
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| 188 | int rv; |
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| 189 | const char answer[] = "I am a dummy\n"; |
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| 190 | |
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| 191 | sd = socket(AF_INET, SOCK_STREAM, 0); |
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| 192 | assert(sd > 0); |
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| 193 | |
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| 194 | memset(&addr, 0, sizeof addr); |
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| 195 | addr.sin_family = AF_INET; |
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| 196 | addr.sin_addr.s_addr = INADDR_ANY; |
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| 197 | addr.sin_port = htons(port); |
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| 198 | |
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| 199 | rv = bind(sd, (struct sockaddr *)&addr, sizeof(addr)); |
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| 200 | assert(rv == 0); |
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| 201 | |
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| 202 | rv = listen(sd, 10); |
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| 203 | assert(rv == 0); |
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| 204 | |
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| 205 | for(;;) { |
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| 206 | addrlen = sizeof(client_addr); |
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| 207 | client = accept(sd, (struct sockaddr *)&client_addr, &addrlen); |
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| 208 | if(client > 0) { |
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| 209 | write(client, answer, strlen(answer)); |
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| 210 | close(client); |
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| 211 | } |
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| 212 | } |
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| 213 | } |
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| 214 | |
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| 215 | static void |
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| 216 | spawn_server(uint16_t port) |
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| 217 | { |
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| 218 | rtems_status_code sc; |
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| 219 | rtems_id tid; |
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| 220 | |
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| 221 | sc = rtems_task_create(rtems_build_name('s','r','v',' '), |
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| 222 | SERVER_TASK_PRIO, |
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| 223 | RTEMS_MINIMUM_STACK_SIZE, |
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| 224 | RTEMS_DEFAULT_MODES, |
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| 225 | RTEMS_DEFAULT_ATTRIBUTES, |
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| 226 | &tid); |
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| 227 | assert(sc == RTEMS_SUCCESSFUL); |
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| 228 | sc = rtems_task_start(tid, tcp_server_task, port); |
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| 229 | assert(sc == RTEMS_SUCCESSFUL); |
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| 230 | } |
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| 231 | |
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| 232 | /* Start a few services to test */ |
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| 233 | static void |
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| 234 | prepare_services() |
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| 235 | { |
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| 236 | spawn_server(TELNET_PORT); |
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| 237 | spawn_server(FTP_PORT); |
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| 238 | } |
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| 239 | |
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| 240 | /* Create some additional loopback interfaces for the test. */ |
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| 241 | static void |
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| 242 | prepare_interfaces() |
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| 243 | { |
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| 244 | int exit_code; |
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| 245 | char *lo1[] = { |
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| 246 | "ifconfig", "lo1", "create", "inet", LO1_IP, |
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| 247 | "netmask", "255.255.0.0", NULL |
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| 248 | }; |
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| 249 | char *lo2[] = { |
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| 250 | "ifconfig", "lo2", "create", "inet", LO2_IP, |
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| 251 | "netmask", "255.255.0.0", NULL |
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| 252 | }; |
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| 253 | |
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| 254 | puts("--- create lo1 and lo2"); |
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| 255 | exit_code = rtems_bsd_command_ifconfig(ARGC(lo1), lo1); |
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| 256 | assert(exit_code == EXIT_SUCCESS); |
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| 257 | exit_code = rtems_bsd_command_ifconfig(ARGC(lo2), lo2); |
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| 258 | assert(exit_code == EXIT_SUCCESS); |
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| 259 | } |
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| 260 | |
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| 261 | static void |
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| 262 | check_tcp_port(char *host, bool expect_open, uint16_t port) |
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| 263 | { |
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| 264 | int sd; |
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| 265 | struct sockaddr_in addr; |
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| 266 | struct hostent *server; |
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| 267 | int rv; |
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| 268 | struct timeval tv; |
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| 269 | fd_set select_set; |
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| 270 | |
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| 271 | sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
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| 272 | assert(sd > 0); |
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| 273 | |
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| 274 | /* make socket nonblocking */ |
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| 275 | rv = fcntl(sd, F_GETFL, NULL); |
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| 276 | assert(rv >= 0); |
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| 277 | rv |= O_NONBLOCK; |
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| 278 | rv = fcntl(sd, F_SETFL, rv); |
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| 279 | assert(rv == 0); |
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| 280 | |
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| 281 | memset(&addr, 0, sizeof(addr)); |
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| 282 | addr.sin_family = AF_INET; |
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| 283 | addr.sin_port = htons(port); |
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| 284 | |
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| 285 | server = gethostbyname(host); |
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| 286 | assert(server != NULL); |
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| 287 | memcpy(&addr.sin_addr.s_addr, server->h_addr, server->h_length); |
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| 288 | |
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| 289 | rv = connect(sd, (struct sockaddr *)&addr, sizeof(addr)); |
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| 290 | if(rv == 0) { |
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| 291 | /* successfully connected */ |
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| 292 | assert(expect_open == true); |
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| 293 | } else { |
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| 294 | if(errno != EINPROGRESS) { |
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| 295 | assert(expect_open == false); |
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| 296 | } else { |
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| 297 | /* wait for connection or timeout */ |
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| 298 | memset(&tv, 0, sizeof(tv)); |
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| 299 | tv.tv_usec = 100000; |
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| 300 | |
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| 301 | FD_ZERO(&select_set); |
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| 302 | FD_SET(sd, &select_set); |
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| 303 | rv = select(sd+1, NULL, &select_set, NULL, &tv); |
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| 304 | |
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| 305 | /* rv < 0 would be an error |
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| 306 | * rv == 0 would be an timeout |
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| 307 | * rv > 0 would be success */ |
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| 308 | if(expect_open == false) { |
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| 309 | assert(rv == 0); |
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| 310 | } else { |
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| 311 | assert(rv > 0); |
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| 312 | } |
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| 313 | } |
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| 314 | } |
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| 315 | |
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| 316 | rv = close(sd); |
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| 317 | assert(rv == 0); |
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| 318 | } |
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| 319 | |
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| 320 | static void |
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| 321 | check_telnet(char *host, bool expect_open) |
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| 322 | { |
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| 323 | check_tcp_port(host, expect_open, TELNET_PORT); |
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| 324 | } |
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| 325 | |
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| 326 | static void |
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| 327 | check_ftp(char *host, bool expect_open) |
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| 328 | { |
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| 329 | check_tcp_port(host, expect_open, FTP_PORT); |
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| 330 | } |
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| 331 | |
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| 332 | /* Check if services work like expected */ |
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| 333 | static void |
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| 334 | check_services(char *host, bool exp_telnet, bool exp_ftp) |
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| 335 | { |
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| 336 | check_telnet(host, exp_telnet); |
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| 337 | check_ftp(host, exp_ftp); |
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| 338 | } |
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| 339 | |
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| 340 | static void |
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| 341 | disable_pf(bool ignore_not_enabled) |
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| 342 | { |
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| 343 | int exit_code; |
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| 344 | char *pfctl[] = {"pfctl", "-d", "-q", NULL}; |
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| 345 | |
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| 346 | exit_code = rtems_bsd_command_pfctl(ARGC(pfctl), pfctl); |
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| 347 | assert(ignore_not_enabled || (exit_code == EXIT_SUCCESS)); |
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| 348 | } |
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| 349 | |
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| 350 | static void |
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| 351 | enable_pf() |
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| 352 | { |
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| 353 | int exit_code; |
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| 354 | char *pfctl[] = {"pfctl", "-e", "-q", NULL}; |
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| 355 | |
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| 356 | exit_code = rtems_bsd_command_pfctl(ARGC(pfctl), pfctl); |
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| 357 | assert(exit_code == EXIT_SUCCESS); |
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| 358 | } |
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| 359 | |
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| 360 | /* Execute pfctl two times with the given arguments. Check the resources. */ |
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| 361 | static void |
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| 362 | run_pfctl(int argc, char *argv[], int expected_result) |
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| 363 | { |
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| 364 | int exit_code; |
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| 365 | rtems_resource_snapshot snapshot, snapshot2; |
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| 366 | |
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| 367 | exit_code = rtems_bsd_command_pfctl(argc, argv); |
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| 368 | assert(exit_code == expected_result); |
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| 369 | |
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| 370 | rtems_resource_snapshot_take(&snapshot); |
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| 371 | exit_code = rtems_bsd_command_pfctl(argc, argv); |
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| 372 | assert(exit_code == expected_result); |
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| 373 | rtems_resource_snapshot_take(&snapshot2); |
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| 374 | |
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| 375 | /* heap fragmentation might change so remove it from compare */ |
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| 376 | snapshot.workspace_info.Free.largest = 0; |
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| 377 | snapshot2.workspace_info.Free.largest = 0; |
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| 378 | snapshot.heap_info.Free.largest = 0; |
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| 379 | snapshot2.heap_info.Free.largest = 0; |
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| 380 | assert(rtems_resource_snapshot_equal(&snapshot, &snapshot2)); |
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| 381 | } |
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| 382 | |
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| 383 | static void |
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| 384 | test_pfctl(void) |
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| 385 | { |
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| 386 | char *no_params[] = { |
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| 387 | "pfctl", |
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| 388 | NULL |
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| 389 | }; |
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| 390 | char *invalid[] = { |
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| 391 | "pfctl", |
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| 392 | "-f", |
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| 393 | TEST_CFG_INVALID, |
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| 394 | "-q", |
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| 395 | NULL |
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| 396 | }; |
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| 397 | char *block_most[] = { |
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| 398 | "pfctl", |
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| 399 | "-f", |
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| 400 | TEST_CFG_BLOCK_MOST, |
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| 401 | "-q", |
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| 402 | NULL |
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| 403 | }; |
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| 404 | char *if_depend[] = { |
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| 405 | "pfctl", |
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| 406 | "-f", |
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| 407 | TEST_CFG_IF_DEPEND, |
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| 408 | "-q", |
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| 409 | NULL |
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| 410 | }; |
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| 411 | |
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| 412 | puts("--- run pfctl with no paramters"); |
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| 413 | run_pfctl(ARGC(no_params), no_params, EXIT_FAILURE); |
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| 414 | |
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| 415 | puts("--- load invalid rule"); |
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| 416 | run_pfctl(ARGC(invalid), invalid, EXIT_FAILURE); |
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| 417 | |
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| 418 | puts("--- load rule to block input and most output"); |
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| 419 | run_pfctl(ARGC(block_most), block_most, EXIT_SUCCESS); |
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| 420 | |
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| 421 | puts("--- load rule to block if dependent"); |
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| 422 | run_pfctl(ARGC(if_depend), if_depend, EXIT_SUCCESS); |
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| 423 | } |
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| 424 | |
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| 425 | static void |
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| 426 | test_allow_lo1() |
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| 427 | { |
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| 428 | char *pfctl[] = { |
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| 429 | "pfctl", |
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| 430 | "-f", |
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| 431 | TEST_CFG_ALLOW_LO1, |
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| 432 | "-q", |
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| 433 | NULL |
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| 434 | }; |
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| 435 | |
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| 436 | disable_pf(true); |
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| 437 | |
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| 438 | puts("--- check services"); |
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| 439 | check_services(LO1_IP, true, true); |
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| 440 | check_services(LO2_IP, true, true); |
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| 441 | |
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| 442 | puts("--- load and enable rule to allow only lo1"); |
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| 443 | run_pfctl(ARGC(pfctl), pfctl, EXIT_SUCCESS); |
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| 444 | enable_pf(); |
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| 445 | |
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| 446 | puts("--- check services"); |
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| 447 | check_services(LO1_IP, true, true); |
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| 448 | check_services(LO2_IP, false, false); |
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| 449 | } |
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| 450 | |
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| 451 | static void |
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| 452 | test_telnet_lo1() |
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| 453 | { |
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| 454 | char *pfctl[] = { |
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| 455 | "pfctl", |
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| 456 | "-f", |
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| 457 | TEST_CFG_TELNET_LO1, |
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| 458 | "-q", |
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| 459 | NULL |
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| 460 | }; |
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| 461 | |
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| 462 | disable_pf(true); |
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| 463 | |
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| 464 | puts("--- check services"); |
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| 465 | check_services(LO1_IP, true, true); |
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| 466 | check_services(LO2_IP, true, true); |
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| 467 | |
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| 468 | puts("--- load and enable rule to allow telnet on lo1"); |
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| 469 | run_pfctl(ARGC(pfctl), pfctl, EXIT_SUCCESS); |
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| 470 | enable_pf(); |
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| 471 | |
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| 472 | puts("--- check services"); |
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| 473 | check_services(LO1_IP, true, false); |
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| 474 | check_services(LO2_IP, false, false); |
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| 475 | } |
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| 476 | |
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[c117a28] | 477 | static void |
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| 478 | test_main(void) |
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| 479 | { |
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[2d1da0d] | 480 | prepare_files(); |
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| 481 | prepare_interfaces(); |
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| 482 | prepare_services(); |
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| 483 | |
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| 484 | test_pfctl(); |
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| 485 | |
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| 486 | test_allow_lo1(); |
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| 487 | test_telnet_lo1(); |
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| 488 | |
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[c117a28] | 489 | exit(0); |
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| 490 | } |
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| 491 | |
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| 492 | #include <machine/rtems-bsd-sysinit.h> |
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| 493 | |
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| 494 | SYSINIT_NEED_FIREWALL_PF; |
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| 495 | SYSINIT_NEED_FIREWALL_PFLOG; |
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| 496 | |
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| 497 | #include <rtems/bsd/test/default-network-init.h> |
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