initial commit

Author: codeplea

.appveyor.yml

@@ -0,0 +1,48 @@
+
+environment:
+  matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      BNAME: "VS2015 x86"
+      MATRIX_EVAL: "\"C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\vcvarsall.bat\" x86"
+      CC: "cl.exe"
+      platform: x86
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      BNAME: "MinGW"
+      MATRIX_EVAL: "set PATH=C:\\MinGW\\msys\\1.0\\local\\bin;C:\\MinGW\\msys\\1.0\\mingw\\bin;C:\\MinGW\\msys\\1.0\\bin;C:\\MinGW\\bin"
+      CC: "gcc"
+      CEXTRA: "-liphlpapi -lws2_32"
+      platform: x86
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      BNAME: "Clang"
+      MATRIX_EVAL: "set PATH=C:\\Program Files\\LLVM\\bin"
+      CC: "clang"
+      CEXTRA: "-liphlpapi -lws2_32"
+      platform: x86
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      BNAME: "VS2015 x64"
+      MATRIX_EVAL: "\"C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\vcvarsall.bat\" x64"
+      CC: "cl.exe"
+      platform: x64
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      BNAME: "VS2017 x86"
+      MATRIX_EVAL: "\"C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Auxiliary\\Build\\vcvars32.bat\""
+      CC: "cl.exe"
+      platform: x86
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      BNAME: "VS2017 x64"
+      MATRIX_EVAL: "\"C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Auxiliary\\Build\\vcvars64.bat\""
+      CC: "cl.exe"
+      platform: x64
+
+
+before_build:
+  - echo "%MATRIX_EVAL%"
+  - "%MATRIX_EVAL%"
+
+build_script:
+  - ./test/build.bat

.travis.yml

@@ -0,0 +1,78 @@
+language: c
+
+matrix:
+  include:
+    - os: linux
+      name: "linux gcc"
+      compiler: gcc
+
+    - os: linux
+      name: "linux gcc-4.9"
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env:
+         - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
+
+    - os: linux
+      name: "linux gcc-5"
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-5
+      env:
+         - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
+
+    - os: linux
+      name: "linux gcc-6"
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-6
+      env:
+        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+
+    - os: linux
+      name: "linux gcc-7"
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-7
+      env:
+        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
+
+    - os: osx
+      name: "osx gcc-4.9"
+      osx_image: xcode8
+      env:
+        - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
+
+    - os: osx
+      name: "osx clang"
+      compiler: clang
+      env:
+        - MATRIX_EVAL=""
+
+    - os: linux
+      name: "linux clang"
+      compiler: clang
+      env:
+        - MATRIX_EVAL=""
+
+
+
+before_install:
+    - eval "${MATRIX_EVAL}"
+    - ${CC} --version
+
+script:
+  - ./test/build.sh

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 Packt
+Copyright (c) 2018 Lewis Van Winkle
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,2 +1,111 @@
+[![Build Status](https://travis-ci.org/codeplea/Hands-On-Network-Programming-with-C.svg?branch=master)](https://travis-ci.org/codeplea/Hands-On-Network-Programming-with-C)
+[![Build status](https://ci.appveyor.com/api/projects/status/yarb3kmmn5db21vn?svg=true)](https://ci.appveyor.com/project/codeplea/hands-on-network-programming-with-c)
+
 # Hands-On-Network-Programming-with-C
-Hands-On Network Programming with C, published by Packt
+
+This repo contains the code which accompanies the book "Hands-On Network
+Programming with C", written by Lewis Van Winkle. The code is released under
+the MIT license.
+
+Unless otherwise noted, all programs will compile cleanly on Windows, Linux,
+and macOS, and as C or C++. Code is tested with MinGW and Visual Studio on
+Windows, gcc and clang on Linux and macOS.
+
+
+## Chapter 1
+
+* **[chap01/win_init.c](chap01/win_init.c)** Example code to initialize Winsock. (Windows only)
+* **[chap01/win_list.c](chap01/win_list.c)** List all local IP addresses. (Windows only)
+* **[chap01/unix_list.c](chap01/unix_list.c)** List all local IP addresses. (Linux and macOS only)
+
+## Chapter 2
+
+* **[chap02/sock_init.c](chap02/sock_init.c)** Example program to include all needed headers and initialize.
+* **[chap02/time_console.c](chap02/time_console.c)** Prints to console the current date and time.
+* **[chap02/time_server.c](chap02/time_server.c)** Serves a web page giving current date and time.
+* **[chap02/time_server_ipv6.c](chap02/time_server_ipv6.c)** As above, but listening for IPv6 connections.
+* **[chap02/time_server_dual.c](chap02/time_server_dual.c)** As above, but listening for IPv6/IPv4 dual stack connections.
+
+## Chapter 3
+
+* **[chap03/tcp_client.c](chap03/tcp_client.c)** Establish TCP connection and send/receive data from the console.
+* **[chap03/tcp_serve_toupper.c](chap03/tcp_serve_toupper.c)** TCP server servicing multiple connections using `select()`. Echos received data back to client in all upper-case.
+* **[chap03/tcp_serve_toupper_fork.c](chap03/tcp_serve_toupper_fork.c)** As above, but uses `fork()` instead of `select()`. (Linux and macOS only)
+* **[chap03/tcp_serve_chat.c](chap03/tcp_serve_chat.c)** TCP server which relays received data to every other connected client.
+
+## Chapter 4
+
+* **[chap04/udp_client.c](chap04/udp_client.c)** Send/receive UDP data from the console.
+* **[chap04/udp_recvfrom.c](chap04/udp_recvfrom.c)** Uses `recvfrom()` to receive one UDP packet.
+* **[chap04/udp_sendto.c](chap04/udp_sendto.c)** Uses `sendto()` to send one UDP packet.
+* **[chap04/udp_serve_toupper.c](chap04/udp_serve_toupper.c)** Receives UDP data, and echos it back to the sender in all upper-case.
+* **[chap04/udp_serve_toupper_simple.c](chap04/udp_serve_toupper_simple.c)** As above, but doesn't use `select()`.
+
+## Chapter 5
+
+* **[chap05/lookup.c](chap05/lookup.c)** Uses `getaddrinfo()` to lookup addresses for a given hostname.
+* **[chap05/dns_query.c](chap05/dns_query.c)** Encodes and sends a DNS query, then decodes the response.
+
+## Chapter 6
+
+* **[chap06/web_get.c](chap06/web_get.c)** A minimal HTTP client which will download a web resource from a given URL.
+
+## Chapter 7
+
+* **[chap07/web_server.c](chap07/web_server.c)** A minimal web server.
+* **[chap07/web_server2.c](chap07/web_server2.c)** A minimal web server (no globals).
+
+## Chapter 8
+
+* **[chap08/smtp_send.c](chap08/smtp_send.c)** A simple email sender.
+
+## Chapter 9
+
+The examples in this chapter use OpenSSL. Be sure to link against the OpenSSL
+libraries when compiling (`-lssl -lcrypto`).
+
+* **[chap09/openssl_version.c](chap09/openssl_version.c)** A program to report the installed OpenSSL version.
+* **[chap09/https_simple.c](chap09/https_simple.c)** A minimal program that requests a web page using HTTPS.
+* **[chap09/https_get.c](chap09/https_get.c)** The HTTP client of chapter 6 modified to use HTTPS.
+* **[chap09/tls_client.c](chap09/tls_client.c)** The TCP client program of chapter 3 modified to use TLS/SSL.
+* **[chap09/tls_get_cert.c](chap09/tls_get_cert.c)** Prints a certificate from a TLS/SSL server.
+
+## Chapter 10
+
+The examples in this chapter use OpenSSL. Be sure to link against the OpenSSL
+libraries when compiling (`-lssl -lcrypto`).
+
+* **[chap10/tls_time_server.c](chap10/tls_time_server.c)** The time server of chapter 2 modified to use HTTPS.
+* **[chap10/https_server.c](chap10/https_server.c)** The web server of chapter 7 modified to use HTTPS.
+
+## Chapter 11
+
+The examples in this chapter use libssh. Be sure to link against the libssh libraries when compiling (`-lssh`).
+
+* **[chap11/ssh_version.c](chap11/ssh_version.c)** A program to report the libssh version.
+* **[chap11/ssh_connect.c](chap11/ssh_connect.c)** A minimal client that establishes a ssh connection.
+* **[chap11/ssh_auth.c](chap11/ssh_auth.c)** A client which attempts authentication.
+* **[chap11/ssh_command.c](chap11/ssh_command.c)** A client that runs a single command over ssh.
+* **[chap11/ssh_download.c](chap11/ssh_download.c)** A client that downloads a file over ssh.
+
+
+## Chapter 12
+
+This chapter doesn't include any example programs.
+
+## Chapter 13
+
+* **[chap13/connect_timeout.c](chap13/connect_timeout.c)** Shows how to timeout a `connect()` call early.
+* **[chap13/connect_blocking.c](chap13/connect_blocking.c)** For comparison with **connect_timeout.c**.
+* **[chap13/server_reuse.c](chap13/server_reuse.c)** Demonstrates the use of `SO_REUSEADDR`.
+* **[chap13/server_noreuse.c](chap13/server_noreuse.c)** For comparison with **server_reuse.c**.
+* **[chap13/server_crash.c](chap13/server_crash.c)** This server purposefully writes to a TCP socket after the client disconnects.
+* **[chap13/error_text.c](chap13/error_text.c)** Shows how to obtain error code descriptions.
+* **[chap13/big_send.c](chap13/big_send.c)** TCP client. Sends lots of data after connecting. Used to show blocking behaviour of `send()`.
+* **[chap13/server_ignore.c](chap13/server_ignore.c)** TCP server. Accepts connections, then simply ignores them. Used to show blocking behaviour of `send()`.
+* **[chap13/setsize.c](chap13/setsize.c)** Shows max number of sockets `select()` can handle.
+
+## Chapter 14
+
+This chapter doesn't include any example programs.
+

chap01/unix_list.c

@@ -0,0 +1,63 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2018 Lewis Van Winkle
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <sys/socket.h>
+#include <netdb.h>
+#include <ifaddrs.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+int main() {
+
+    struct ifaddrs *addresses;
+
+    if (getifaddrs(&addresses) == -1) {
+        printf("getifaddrs call failed\n");
+        return -1;
+    }
+
+    struct ifaddrs *address = addresses;
+    while(address) {
+        int family = address->ifa_addr->sa_family;
+        if (family == AF_INET || family == AF_INET6) {
+
+            printf("%s\t", address->ifa_name);
+            printf("%s\t", family == AF_INET ? "IPv4" : "IPv6");
+
+            char ap[100];
+            const int family_size = family == AF_INET ?
+                sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
+            getnameinfo(address->ifa_addr,
+                    family_size, ap, sizeof(ap), 0, 0, NI_NUMERICHOST);
+            printf("\t%s\n", ap);
+
+        }
+        address = address->ifa_next;
+    }
+
+
+    freeifaddrs(addresses);
+    return 0;
+}

chap01/win_init.c

@@ -0,0 +1,43 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2018 Lewis Van Winkle
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <winsock2.h>
+
+#pragma comment(lib, "ws2_32.lib")
+
+int main() {
+    WSADATA d;
+
+    if (WSAStartup(MAKEWORD(2, 2), &d)) {
+        printf("Failed to initialize.\n");
+        return -1;
+    }
+
+    WSACleanup();
+
+    printf("Ok.\n");
+
+    return 0;
+}