通過SSH2接口實現sftp client文件上傳

/*
 * Sample showing how to do SFTP write transfers.
 *
 * The sample code has default values for host name, user name, password
 * and path to copy, but you can specify them on the command line like:
 *
 * "sftp 192.168.0.1 user password sftp_write.c /tmp/secrets"
 */

#include "libssh2_config.h"
#include <libssh2.h>
#include <libssh2_sftp.h>

#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>
#include <string.h>


int main(int argc, char *argv[])
{
    unsigned long hostaddr;
    int sock, i, auth_pw = 1;
    struct sockaddr_in sin;
    const char *fingerprint;
    LIBSSH2_SESSION *session;
    const char *username = "username";
    const char *password = "password";
    const char *loclfile = "sftp_write.c";
    const char *sftppath = "/tmp/TEST";
    int rc;
    FILE *local;
    LIBSSH2_SFTP *sftp_session;
    LIBSSH2_SFTP_HANDLE *sftp_handle;
    char mem[1024*100];
    size_t nread;
    char *ptr;
	char dir[256];
	char* pchar;
	char* pchar2;
	LIBSSH2_SFTP_HANDLE *sftp_dir_handle;

#ifdef WIN32
    WSADATA wsadata;
    int err;

    err = WSAStartup(MAKEWORD(2, 0), &wsadata);
    if(err != 0) {
        fprintf(stderr, "WSAStartup failed with error: %d\n", err);
        return 1;
    }
#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];
    }
    if(argc > 4) {
        loclfile = argv[4];
    }
    if(argc > 5) {
        sftppath = argv[5];
    }

    rc = libssh2_init(0);
    if(rc != 0) {
        fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
        return 1;
    }

    local = fopen(loclfile, "rb");
    if(!local) {
        fprintf(stderr, "Can't open local file %s\n", loclfile);
        return -1;
    }

    /*
     * The application code is responsible for creating the socket
     * and establishing the connection
     */
    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, (struct sockaddr*)(&sin),
            sizeof(struct sockaddr_in)) != 0) {
        fprintf(stderr, "failed to connect!\n");
        return -1;
    }

    /* Create a session instance
     */
    session = libssh2_session_init();
    if(!session)
        return -1;

	 /* Since we have set non-blocking, tell libssh2 we are blocking */
    libssh2_session_set_blocking(session, 1);

    /* ... start it up. This will trade welcome banners, exchange keys,
     * and setup crypto, compression, and MAC layers
     */
    rc = libssh2_session_handshake(session, sock);
    if(rc) {
        fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
        return -1;
    }

    /* At this point we havn't yet authenticated.  The first thing to do
     * is check the hostkey's fingerprint against our known hosts Your app
     * may have it hard coded, may go to a file, may present it to the
     * user, that's your call
     */
    fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
    fprintf(stderr, "Fingerprint: ");
    for(i = 0; i < 20; i++) {
        fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
    }
    fprintf(stderr, "\n");

    if(auth_pw) {
        /* We could authenticate via password */
        if(libssh2_userauth_password(session, username, password)) {
            fprintf(stderr, "Authentication by password failed.\n");
            goto shutdown;
        }
    }
    else {
        /* Or by public key */
        const char *pubkey = "/home/username/.ssh/id_rsa.pub";
        const char *privkey = "/home/username/.ssh/id_rsa.pub";
        if(libssh2_userauth_publickey_fromfile(session, username,
                                               pubkey, privkey,
                                               password)) {
            fprintf(stderr, "\tAuthentication by public key failed\n");
            goto shutdown;
        }
    }

    fprintf(stderr, "libssh2_sftp_init()!\n");
    sftp_session = libssh2_sftp_init(session);

    if(!sftp_session) {
        fprintf(stderr, "Unable to init SFTP session\n");
        goto shutdown;
    }
	 
#if	1
	if( *(sftppath + strlen(sftppath) - 1) == '/') {
        fprintf(stderr, "Please specify file name for SFTP server\n");
        goto shutdown;
    }

	/* Loop Create DIR */
	memset(dir, 0, sizeof(dir));
	pchar = strchr(sftppath, '/');
	if( pchar == sftppath ) {
		while( strlen(pchar) > 0 && (pchar2 = strchr((char *)pchar + 1, '/')) ) {
			// example: /tmp/1.txt		or	/tmp/1.txt/	or	/tmp/test/files/1.txt	or	 /tmp//test/files/1.txt  all will deal
			if(strlen(pchar2) < 1)
				break;
			
			if((pchar - pchar2) == 1) {
				pchar = pchar2;
				continue;
			}
				
			strncpy(dir + strlen(dir), pchar, pchar2 - pchar);
			fprintf(stderr, "DIR is %s\n", dir);

			fprintf(stderr, "libssh2_sftp_opendir()!\n");
			/* Request a dir listing via SFTP */
			sftp_dir_handle = libssh2_sftp_opendir(sftp_session, dir);

			if(!sftp_dir_handle) {
			    fprintf(stderr, "Unable to open dir with SFTP, create it\n");

				/* Make a directory via SFTP */
		   		 rc = libssh2_sftp_mkdir(sftp_session, dir,
		                            LIBSSH2_SFTP_S_IRWXU|
		                            LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IXGRP|
		                            LIBSSH2_SFTP_S_IROTH|LIBSSH2_SFTP_S_IXOTH);

		    	if(rc) {
		        	fprintf(stderr, "libssh2_sftp_mkdir failed: %d\n", rc);
					break;
		    	}	
			}else {
				libssh2_sftp_closedir(sftp_dir_handle);
			}
			pchar = pchar2;
		}
	}
#endif

    fprintf(stderr, "libssh2_sftp_open()!\n");
    /* Request a file via SFTP */
    sftp_handle =
        libssh2_sftp_open(sftp_session, sftppath,
                      LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT|LIBSSH2_FXF_TRUNC,
                      LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|
                      LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);

    if(!sftp_handle) {
        fprintf(stderr, "Unable to open file with SFTP\n");
        goto shutdown;
    }
    fprintf(stderr, "libssh2_sftp_open() is done, now send data!\n");
    do {
        nread = fread(mem, 1, sizeof(mem), local);
        if(nread <= 0) {
            /* end of file */
            break;
        }
        ptr = mem;

        do {
            /* write data in a loop until we block */
            rc = libssh2_sftp_write(sftp_handle, ptr, nread);
            if(rc < 0)
                break;
            ptr += rc;
            nread -= rc;
        } while(nread);

    } while(rc > 0);

    libssh2_sftp_close(sftp_handle);
    libssh2_sftp_shutdown(sftp_session);

shutdown:
    libssh2_session_disconnect(session,
                               "Normal Shutdown, Thank you for playing");
    libssh2_session_free(session);

#ifdef WIN32
    closesocket(sock);
#else
    close(sock);
#endif
    if(local)
        fclose(local);
    fprintf(stderr, "all done\n");

    libssh2_exit();

    return 0;
}

 

《openssl和libssh2在linux環境的編譯過程》

 

openssl-1.0.2u編譯

下載地址:https://www.openssl.org/source/ 

 

1. 配置

./config --prefix=/home/work/openssl-1.0.2u/build

2. 動態編譯需要修改makefile

SHARED_LIBS=libcrypto.so libssl.so

CFLAG加入    "-DOPENSSL_NO_STATIC_ENGINE -fPIC"

3. 編譯中還會報如下錯誤：

make[2]: Entering directory `/home/work/openssl-1.0.2u/test'

rc4test.o: In function `main':

rc4test.c:(.text.startup+0x3b): undefined reference to `OPENSSL_cpuid_setup'

collect2: error: ld returned 1 exit status

只要在test/rc4test.c將報錯的地方註釋掉即可(沒關係！只是測試代碼)

4. 編譯 

make

5. 安裝

make install

 

 

libssh2-1.9.0

下載地址：https://www.libssh2.org/

 

1. 配置

./configure --prefix=`pwd`/build --with-openssl CPPFLAGS="-I/home/work/openssl-1.0.2u/build/include/openssl" LDFLAGS="-ldl -L/home/work/openssl-1.0.2u/build/lib" --enable-static=no

2. 編譯

make

3. 安裝

make install

 

 

把上面的源代碼，放在libssh2-1.9.0/example/目錄下，然後在該目錄下執行make進行編譯。

執行make V=1可以輸出如下完整信息（其實上面的源碼就是ssh2的示例程序，不過我在上面增加了創建文件目錄的功能）：

gcc -DHAVE_CONFIG_H   -I../include -I../example -I/home/work/openssl-1.0.2u/build/include/openssl -I/home/work/openssl-1.0.2u/build/include  -g -O2 -MT sftp_write.o -MD -MP -MF .deps/sftp_write.Tpo -c -o sftp_write.o sftp_write.c

mv -f .deps/sftp_write.Tpo .deps/sftp_write.Po

/bin/sh ../libtool  --tag=CC   --mode=link gcc  -g -O2  -ldl -L/home/work/openssl-1.0.2u/build/lib -o sftp_write sftp_write.o ../src/libssh2.la

libtool: link: gcc -g -O2 -o .libs/sftp_write sftp_write.o  -ldl -L/home/work/openssl-1.0.2u/build/lib ../src/.libs/libssh2.so -Wl,-rpath -Wl,/home/work/libssh2-1.9.0/build/lib

運行測試用例（把本地文件readme.txt，上傳到sftp服務器）：

# sftp服務器ip：192.168.3.79    用戶：test    用戶密碼：123456    本地文件：readme.txt  目標文件：/tmp/readme.txt

./sftp_write 192.168.3.79 test 123456 readme.txt /tmp/readme.txt