libevent的ssl加密功能

继前面两篇博文：

openssl编程之客户端

/article/10545673.html

openssl编程之服务端

/article/10545674.html

此篇博文主要介绍如何在libevent中使用openssl集成

关于libevent的使用方法，请自己百度或关注后续博文

程序如下：

<code class="hljs cpp has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <netinet/in.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <sys/socket.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <fcntl.h></span>

<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <event2/event.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <event2/buffer.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <event2/bufferevent.h></span>

<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <event2/bufferevent_ssl.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <openssl/err.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <openssl/ssl.h></span>

<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <assert.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <unistd.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <string.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <stdlib.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <stdio.h></span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#include <errno.h></span>

<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#define CA_CERT_FILE "server/ca.crt"</span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#define SERVER_CERT_FILE "server/server.crt"</span>
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#define SERVER_KEY_FILE "server/server.key"</span>

SSL* CreateSSL(evutil_socket_t& fd)
{
SSL_CTX* ctx = NULL;
SSL* ssl = NULL;
ctx = SSL_CTX_new (SSLv23_method());
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>( ctx == NULL)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_CTX_new error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 要求校验对方证书  </span>
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 加载CA的证书  </span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!SSL_CTX_load_verify_locations(ctx, CA_CERT_FILE, NULL))
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_CTX_load_verify_locations error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 加载自己的证书  </span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(SSL_CTX_use_certificate_file(ctx, SERVER_CERT_FILE, SSL_FILETYPE_PEM) <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_CTX_use_certificate_file error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 加载自己的私钥  </span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(SSL_CTX_use_PrivateKey_file(ctx, SERVER_KEY_FILE, SSL_FILETYPE_PEM) <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_CTX_use_PrivateKey_file error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 判定私钥是否正确  </span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!SSL_CTX_check_private_key(ctx))
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_CTX_check_private_key error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 将连接付给SSL  </span>
ssl = SSL_new (ctx);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!ssl)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_new error!\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

SSL_set_fd (ssl, fd);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(SSL_accept (ssl) != <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)
{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> icode = -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> iret = SSL_get_error(ssl, icode);
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"SSL_accept error! code = %d, iret = %d\n"</span>, icode, iret);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> NULL;
}

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> ssl;
}

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> socket_read_cb(evutil_socket_t fd, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">short</span> events, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> *arg)
{
SSL* ssl = (SSL*)arg;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span> msg[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4096</span>];
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">memset</span>(msg, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">sizeof</span>(msg));
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> nLen = SSL_read(ssl,msg, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">sizeof</span>(msg));
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">fprintf</span>(stderr, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Get Len %d %s ok\n"</span>, nLen, msg);
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">strcat</span>(msg, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"\n this is from server========server resend to client"</span>);
SSL_write(ssl, msg, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">strlen</span>(msg));
}

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> do_accept(evutil_socket_t listener, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">short</span> event, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> *arg)
{
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">printf</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"do_accept\n"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> event_base *base = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> event_base*)arg;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> sockaddr_storage ss;
socklen_t slen = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">sizeof</span>(ss);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> fd = accept(listener, (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> sockaddr*)&ss, &slen);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (fd < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
perror(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"accept"</span>);
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (fd > FD_SETSIZE)
{
close(fd);
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>
{
SSL* ssl = CreateSSL(fd);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> event *ev = event_new(NULL, -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, NULL, NULL);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//将动态创建的结构体作为event的回调参数</span>
event_assign(ev, base, fd, EV_READ | EV_PERSIST,
socket_read_cb, (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>*)ssl);

event_add(ev, NULL);
}
}

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> run(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)
{
evutil_socket_t listener;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> sockaddr_in <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> event_base *base;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> event *listener_event;

base = event_base_new();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!base)
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*XXXerr*/</span>

<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>.sin_family = AF_INET;
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>.sin_addr.s_addr = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>.sin_port = htons(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8080</span>);

listener = socket(AF_INET, SOCK_STREAM, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);
evutil_make_socket_nonblocking(listener);

<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#ifndef WIN32</span>
{
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> one = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>;
setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &one, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">sizeof</span>(one));
}
<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#endif</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (bind(listener, (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">struct</span> sockaddr*)&<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">sizeof</span>(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sin</span>)) < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
perror(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"bind"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>;
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (listen(listener, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>)<<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
{
perror(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"listen"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>;
}

listener_event = event_new(base, listener, EV_READ|EV_PERSIST, do_accept, (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>*)base);
event_add(listener_event, NULL);

event_base_dispatch(base);
}

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> main(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> argc, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">char</span> **argv)
{
setvbuf(stdout, NULL, _IONBF, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>);

SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();

run();

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; 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padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li><li style="box-sizing: border-box; padding: 0px 5px;">76</li><li style="box-sizing: border-box; padding: 0px 5px;">77</li><li style="box-sizing: border-box; padding: 0px 5px;">78</li><li style="box-sizing: border-box; padding: 0px 5px;">79</li><li style="box-sizing: border-box; padding: 0px 5px;">80</li><li style="box-sizing: border-box; padding: 0px 5px;">81</li><li style="box-sizing: border-box; padding: 0px 5px;">82</li><li style="box-sizing: border-box; padding: 0px 5px;">83</li><li style="box-sizing: border-box; padding: 0px 5px;">84</li><li style="box-sizing: border-box; padding: 0px 5px;">85</li><li style="box-sizing: border-box; padding: 0px 5px;">86</li><li style="box-sizing: border-box; padding: 0px 5px;">87</li><li style="box-sizing: border-box; padding: 0px 5px;">88</li><li style="box-sizing: border-box; padding: 0px 5px;">89</li><li style="box-sizing: border-box; padding: 0px 5px;">90</li><li style="box-sizing: border-box; padding: 0px 5px;">91</li><li style="box-sizing: border-box; padding: 0px 5px;">92</li><li style="box-sizing: border-box; padding: 0px 5px;">93</li><li style="box-sizing: border-box; padding: 0px 5px;">94</li><li style="box-sizing: border-box; padding: 0px 5px;">95</li><li style="box-sizing: border-box; padding: 0px 5px;">96</li><li style="box-sizing: border-box; padding: 0px 5px;">97</li><li style="box-sizing: border-box; padding: 0px 5px;">98</li><li style="box-sizing: border-box; padding: 0px 5px;">99</li><li style="box-sizing: border-box; padding: 0px 5px;">100</li><li style="box-sizing: border-box; padding: 0px 5px;">101</li><li style="box-sizing: border-box; padding: 0px 5px;">102</li><li style="box-sizing: border-box; padding: 0px 5px;">103</li><li style="box-sizing: border-box; padding: 0px 5px;">104</li><li style="box-sizing: border-box; padding: 0px 5px;">105</li><li style="box-sizing: border-box; padding: 0px 5px;">106</li><li style="box-sizing: border-box; padding: 0px 5px;">107</li><li style="box-sizing: border-box; padding: 0px 5px;">108</li><li style="box-sizing: border-box; padding: 0px 5px;">109</li><li style="box-sizing: border-box; padding: 0px 5px;">110</li><li style="box-sizing: border-box; padding: 0px 5px;">111</li><li style="box-sizing: border-box; padding: 0px 5px;">112</li><li style="box-sizing: border-box; padding: 0px 5px;">113</li><li style="box-sizing: border-box; padding: 0px 5px;">114</li><li style="box-sizing: border-box; padding: 0px 5px;">115</li><li style="box-sizing: border-box; padding: 0px 5px;">116</li><li style="box-sizing: border-box; padding: 0px 5px;">117</li><li style="box-sizing: border-box; padding: 0px 5px;">118</li><li style="box-sizing: border-box; padding: 0px 5px;">119</li><li style="box-sizing: border-box; padding: 0px 5px;">120</li><li style="box-sizing: border-box; padding: 0px 5px;">121</li><li style="box-sizing: border-box; padding: 0px 5px;">122</li><li style="box-sizing: border-box; padding: 0px 5px;">123</li><li style="box-sizing: border-box; padding: 0px 5px;">124</li><li style="box-sizing: border-box; padding: 0px 5px;">125</li><li style="box-sizing: border-box; padding: 0px 5px;">126</li><li style="box-sizing: border-box; padding: 0px 5px;">127</li><li style="box-sizing: border-box; padding: 0px 5px;">128</li><li style="box-sizing: border-box; padding: 0px 5px;">129</li><li style="box-sizing: border-box; padding: 0px 5px;">130</li><li style="box-sizing: border-box; padding: 0px 5px;">131</li><li style="box-sizing: border-box; padding: 0px 5px;">132</li><li style="box-sizing: border-box; padding: 0px 5px;">133</li><li style="box-sizing: border-box; padding: 0px 5px;">134</li><li style="box-sizing: border-box; padding: 0px 5px;">135</li><li style="box-sizing: border-box; padding: 0px 5px;">136</li><li style="box-sizing: border-box; padding: 0px 5px;">137</li><li style="box-sizing: border-box; padding: 0px 5px;">138</li><li style="box-sizing: border-box; padding: 0px 5px;">139</li><li style="box-sizing: border-box; padding: 0px 5px;">140</li><li style="box-sizing: border-box; padding: 0px 5px;">141</li><li style="box-sizing: border-box; padding: 0px 5px;">142</li><li style="box-sizing: border-box; padding: 0px 5px;">143</li><li style="box-sizing: border-box; padding: 0px 5px;">144</li><li style="box-sizing: border-box; padding: 0px 5px;">145</li><li style="box-sizing: border-box; padding: 0px 5px;">146</li><li style="box-sizing: border-box; padding: 0px 5px;">147</li><li style="box-sizing: border-box; padding: 0px 5px;">148</li><li style="box-sizing: border-box; padding: 0px 5px;">149</li><li style="box-sizing: border-box; padding: 0px 5px;">150</li><li style="box-sizing: border-box; padding: 0px 5px;">151</li><li style="box-sizing: border-box; padding: 0px 5px;">152</li><li style="box-sizing: border-box; padding: 0px 5px;">153</li><li style="box-sizing: border-box; padding: 0px 5px;">154</li><li style="box-sizing: border-box; padding: 0px 5px;">155</li><li style="box-sizing: border-box; padding: 0px 5px;">156</li><li style="box-sizing: border-box; padding: 0px 5px;">157</li><li style="box-sizing: border-box; padding: 0px 5px;">158</li><li style="box-sizing: border-box; padding: 0px 5px;">159</li><li style="box-sizing: border-box; padding: 0px 5px;">160</li><li style="box-sizing: border-box; padding: 0px 5px;">161</li><li style="box-sizing: border-box; padding: 0px 5px;">162</li><li style="box-sizing: border-box; padding: 0px 5px;">163</li><li style="box-sizing: border-box; padding: 0px 5px;">164</li><li style="box-sizing: border-box; padding: 0px 5px;">165</li><li style="box-sizing: border-box; padding: 0px 5px;">166</li><li style="box-sizing: border-box; padding: 0px 5px;">167</li><li style="box-sizing: border-box; padding: 0px 5px;">168</li><li style="box-sizing: border-box; padding: 0px 5px;">169</li><li style="box-sizing: border-box; padding: 0px 5px;">170</li><li style="box-sizing: border-box; padding: 0px 5px;">171</li><li style="box-sizing: border-box; padding: 0px 5px;">172</li><li style="box-sizing: border-box; padding: 0px 5px;">173</li><li style="box-sizing: border-box; padding: 0px 5px;">174</li><li style="box-sizing: border-box; padding: 0px 5px;">175</li><li style="box-sizing: border-box; padding: 0px 5px;">176</li><li style="box-sizing: border-box; padding: 0px 5px;">177</li><li style="box-sizing: border-box; padding: 0px 5px;">178</li></ul>

编写makefile或者直接使用命令进行编译，得到可执行文件test

libevent服务端：

<code class="hljs vbscript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root@localhost LibeventSSL]# ./test
do_accept
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">56</span>
this <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> from client+++++++++++++++client send <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">server</span> ok
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>  ok
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>  ok
[root@localhost LibeventSSL]#</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

客户端：

<code class="hljs vbscript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root@localhost SSLTestC]# ./test
<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Server</span> Running <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> LINUX
SSL_CTX_load_verify_locations start!
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">108</span>
this <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> from client+++++++++++++++client send <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">server</span>
this <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> from <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">server</span>========<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">server</span> resend <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> client ok
[root@localhost SSLTestC]# </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

表明客户端跟服务器已经正常通信，同样的，进行抓包分析的话，得到只能是

不可识别的乱码，表明通信会话已经加密，ssl功能已经生效
此篇博文跟前面的 openssl编程之服务端有一个需要注意的地方，若socket为

非阻塞，在进行SSL_accept和SSL_read SSL_wirte时需要注意，此程序只是实现了加密和通信，并未处理服务器连接的问题，比如客户端关闭连接等，表现形式如：服务器端打印了两次的：

<code class="hljs vbscript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>  ok
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">Get</span> <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">Len</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>  ok</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

后面面将专门

写一篇博文进行讲解

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