libssh2

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C函数库

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libssh2是一个C函数库，用来实现SSH2协议，是一套安全通讯协议框架。

中文名: libssh2
简介: 是一套安全通讯协议框架

产品: 有openssh，putty
有关依赖库: 熟悉SSH2 库函数用法

简介

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SSH2是一套安全通讯协议框架（早期的SSH1由于存在安全漏洞），基于SSH2协议的产品主要有openssh，putty，SSH Secure Shell Client等，这些都是开源的，但是这些代码非常难懂而且复杂，一个个函数深层次的调用很快就让人在C语言代码的海洋中迷失了方向，妄图通过从这些开源软件中抽取程序代码段来“组装”自己的应用程序是非一般人所能实现的。不过还好网络上出现了一些开源的SSH2开发库，利用这些开发库开发自己的SSH2程序却要简单得多，由于这些开发库都是开源的，往往是针对linux平台的，而且一般只提供了源代码。在windows上利用这些库还必须要完成：编译有关依赖库--＞编译ssh2库--＞集成到开发环境（如Visual Studio）中--＞熟悉SSH2 库函数用法--＞开始编写自己的程序.

参考用例

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/* *SampleshowinghowtodoSSH2connect. *Thesamplecodehasdefaultvaluesforhostname,username,password *andpathtocopy,butyoucanspecifythemonthecommandlinelike: *"ssh2hostuserpassword[-p|-i|-k]" #include"libssh2_config.h" #include<libssh2.h> #include<libssh2_sftp.h> #ifdef HAVE_WINDOWS_H #include<windows.h> #endif #ifdef HAVE_WINSOCK2_H #include<winsock2.h> #endif #ifdef HAVE_SYS_SOCKET_H #include<sys/socket.h> #endif #ifdef HAVE_NETINET_IN_H #include<netinet/in.h> #endif #ifdef HAVE_UNISTD_H #include<unistd.h> #endif #ifdef HAVE_ARPA_INET_H #include<arpa/inet.h> #endif #include<sys/types.h> #include<fcntl.h> #include<errno.h> #include<stdio.h> #include<ctype.h> const char* keyfile1="~/.ssh/id_rsa.pub"; const char* keyfile2="~/.ssh/id_rsa"; const char* username="username"; const char* password="password"; static void kbd_callback(const char* name,intname_len, const char* instruction,intinstruction_len, intnum_prompts, const LIBSSH2_USERAUTH_KBDINT_PROMPT* prompts, LIBSSH2_USERAUTH_KBDINT_RESPONSE* responses, void**abstract) (void)name; (void)name_len; (void)instruction; (void)instruction_len; if(num_prompts==1){ responses[0].text=strdup(password); responses[0].length=strlen(password); (void)prompts; (void)abstract; }/*kbd_callback*/ int main(intargc,char* argv[]) unsigned long hostaddr; intrc,sock,i,auth_pw=0; struct sockaddr_insin; const char* fingerprint; char* userauthlist; LIBSSH2_SESSION* session; LIBSSH2_CHANNEL* channel; #ifdefWIN32 WSADATA wsadata; WSAStartup(MAKEWORD(2,0),&wsadata); #endif if(argc>1){ hostaddr=inet_addr(argv[1]); }else{ hostaddr=htonl(0x7F000001); if(argc>2){ username=argv[2]; if(argc>3){ password=argv[3]; rc=libssh2_init(0); if(rc!=0){ fprintf(stderr,"libssh2initializationfailed(%d)\n",rc); return1; /*Ultrabasic"connecttoport22onlocalhost".Yourcodeis *responsibleforcreatingthesocketestablishingtheconnection sock=socket(AF_INET,SOCK_STREAM,0); sin.sin_family=AF_INET; sin.sin_port=htons(22); sin.sin_addr.s_addr=hostaddr; if(connect(sock,(structsockaddr*)(&sin), sizeof(structsockaddr_in))!=0){ fprintf(stderr,"failedtoconnect!\n"); return-1; /*Createasessioninstanceandstartitup.Thiswilltradewelcome *banners,exchangekeys,andsetupcrypto,compression,andMAClayers session=libssh2_session_init(); if(libssh2_session_handshake(session,sock)){ fprintf(stderr,"FailureestablishingSSHsession\n"); return-1; /*Atthispointwehavn'tauthenticated.Thefirstthingtodoischeck *thehostkey'sfingerprintagainstourknownhostsYourappmayhaveit *hardcoded,maygotoafile,maypresentittotheuser,that'syour *call fingerprint=libssh2_hostkey_hash(session,LIBSSH2_HOSTKEY_HASH_SHA1); fprintf(stderr,"Fingerprint:"); for(i=0;i<20;i++){ fprintf(stderr,"%02X",(unsignedchar)fingerprint[i]); fprintf(stderr,"\n"); /*checkwhatauthenticationmethodsareavailable*/ userauthlist=libssh2_userauth_list(session,username,strlen(username)); fprintf(stderr,"Authenticationmethods:%s\n",userauthlist); if(strstr(userauthlist,"password")!=NULL){ auth_pw|=1; if(strstr(userauthlist,"keyboard-interactive")!=NULL){ auth_pw|=2; if(strstr(userauthlist,"publickey")!=NULL){ auth_pw|=4; /*ifwegotan4.argumentwesetthisoptionifsupported*/ if(argc>4){ if((auth_pw&1)&&!strcasecmp(argv[4],"-p")){ auth_pw=1; if((auth_pw&2)&&!strcasecmp(argv[4],"-i")){ auth_pw=2; if((auth_pw&4)&&!strcasecmp(argv[4],"-k")){ auth_pw=4; if(auth_pw&1){ /*Wecouldauthenticateviapassword*/ if(libssh2_userauth_password(session,username,password)){ fprintf(stderr,"\tAuthenticationbypasswordfailed!\n"); gotoshutdown; }else{ fprintf(stderr,"\tAuthenticationbypasswordsucceeded.\n"); }elseif(auth_pw&2){ /*Orviakeyboard-interactive*/ if(libssh2_userauth_keyboard_interactive(session,username, &kbd_callback)){ fprintf(stderr, "\tAuthenticationbykeyboard-interactivefailed!\n"); gotoshutdown; }else{ fprintf(stderr, "\tAuthenticationbykeyboard-interactivesucceeded.\n"); }elseif(auth_pw&4){ /*Orbypublickey*/ if(libssh2_userauth_publickey_fromfile(session,username,keyfile1, keyfile2,password)){ fprintf(stderr,"\tAuthenticationbypublickeyfailed!\n"); gotoshutdown; }else{ fprintf(stderr,"\tAuthenticationbypublickeysucceeded.\n"); }else{ fprintf(stderr,"Nosupportedauthenticationmethodsfound!\n"); gotoshutdown; /*Requestashell*/ if(!(channel=libssh2_channel_open_session(session))){ fprintf(stderr,"Unabletoopenasession\n"); gotoshutdown; /*Someenvironmentvariablesmaybeset, *It'suptotheserverwhichonesit'llallowthough libssh2_channel_setenv(channel,"FOO","bar"); /*Requestaterminalwith'vanilla'terminalemulation *See/etc/termcapformoreoptions if(libssh2_channel_request_pty(channel,"vanilla")){ fprintf(stderr,"Failedrequestingpty\n"); gotoskip_shell; /*OpenaSHELLonthatpty*/ if(libssh2_channel_shell(channel)){ fprintf(stderr,"Unabletorequestshellonallocatedpty\n"); gotoshutdown; /*Atthispointtheshellcanbeinteractedwithusing *libssh2_channel_read() *libssh2_channel_read_stderr() *libssh2_channel_write() *libssh2_channel_write_stderr() *Blockingmodemaybe(en|dis)abledwith:libssh2_channel_set_blocking() *IftheserversendEOF,libssh2_channel_eof()willreturnnon-0 *TosendEOFtotheserveruse:libssh2_channel_send_eof() *Achannelcanbeclosedwith:libssh2_channel_close() *Achannelcanbefreedwith:libssh2_channel_free() skip_shell: if(channel){ libssh2_channel_free(channel); channel=NULL; /*Otherchanneltypesaresupportedvia: *libssh2_scp_send() *libssh2_scp_recv() *libssh2_channel_direct_tcpip() shutdown: libssh2_session_disconnect(session, "NormalShutdown,Thankyouforplaying"); libssh2_session_free(session); #ifdefWIN32 closesocket(sock); #else close(sock); #endif fprintf(stderr,"alldone!\n");

libssh2

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简介

参考用例