libssh2实现上传下载文件
EXTERN_C_START #include <libssh2.h> #include <libssh2_sftp.h> EXTERN_C_END #ifdef WIN32 #define write(f, b, c) write((f), (b), (unsigned int)(c)) #endif #ifdef HAVE_SYS_SOCKET_H #include <sys/socket.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #ifdef HAVE_NETINET_IN_H #include <netinet/in.h> #endif #include <stdio.h> static const char* pubkey = "/home/username/.ssh/id_rsa.pub"; static const char* privkey = "/home/username/.ssh/id_rsa"; static const char* username = "username"; static const char* password = "password"; static const char* sftppath = "/tmp/TEST"; /* source path */ static const char* dest = "/tmp/TEST2"; /* destination path */ static const char* storage = "/tmp/sftp-storage"; /* local file name to store the downloaded file in */ static int waitsocket(libssh2_socket_t socket_fd, LIBSSH2_SESSION* session) { struct timeval timeout; int rc; fd_set fd; fd_set* writefd = NULL; fd_set* readfd = NULL; int dir; timeout.tv_sec = 10; timeout.tv_usec = 0; FD_ZERO(&fd); FD_SET(socket_fd, &fd); /* now make sure we wait in the correct direction */ dir = libssh2_session_block_directions(session); if (dir & LIBSSH2_SESSION_BLOCK_INBOUND) readfd = &fd; if (dir & LIBSSH2_SESSION_BLOCK_OUTBOUND) writefd = &fd; rc = select((int)(socket_fd + 1), readfd, writefd, NULL, &timeout); return rc; } int sftp_rw_main(int argc, char* argv[]) { libssh2_socket_t sock; int i, auth_pw = 1; struct sockaddr_in sin; const char* fingerprint; int rc; LIBSSH2_SESSION* session = NULL; LIBSSH2_SFTP* sftp_session; LIBSSH2_SFTP_HANDLE* sftp_handle; FILE* tempstorage = NULL; char mem[1024*100]; struct timeval timeout; fd_set fd; fd_set fd2; #ifdef WIN32 WSADATA wsadata; rc = WSAStartup(MAKEWORD(2, 2), &wsadata); if (rc) { fprintf(stderr, "WSAStartup failed with error: %d\n", rc); return 1; } #endif if (argc > 1) { username = argv[1]; } if (argc > 2) { password = argv[2]; } if (argc > 3) { sftppath = argv[3]; } if (argc > 4) { dest = argv[4]; } if (argc > 5) { storage = argv[5]; } rc = libssh2_init(0); if (rc) { fprintf(stderr, "libssh2 initialization failed (%d)\n", rc); return 1; } /* Ultra basic "connect to port 22 on localhost". Your code is * responsible for creating the socket establishing the connection */ sock = socket(AF_INET, SOCK_STREAM, 0); if (sock == LIBSSH2_INVALID_SOCKET) { fprintf(stderr, "failed to create socket!\n"); goto shutdown; } sin.sin_family = AF_INET; sin.sin_port = htons(22); sin.sin_addr.s_addr = htonl(0x7F000001); if (connect(sock, (struct sockaddr*)(&sin), sizeof(struct sockaddr_in))) { fprintf(stderr, "failed to connect!\n"); goto shutdown; } /* Create a session instance */ session = libssh2_session_init(); if (!session) { fprintf(stderr, "Could not initialize SSH session!\n"); goto shutdown; } /* ... 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); goto shutdown; } libssh2_session_set_blocking(session, 0); /* At this point we have not 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 */ while ((rc = libssh2_userauth_password(session, username, password)) == LIBSSH2_ERROR_EAGAIN); if (rc) { fprintf(stderr, "Authentication by password failed!\n"); goto shutdown; } } else { /* Or by public key */ while ((rc = libssh2_userauth_publickey_fromfile(session, username, pubkey, privkey, password)) == LIBSSH2_ERROR_EAGAIN); if (rc) { fprintf(stderr, "Authentication by public key failed!\n"); goto shutdown; } } do { sftp_session = libssh2_sftp_init(session); if (!sftp_session) { if (libssh2_session_last_errno(session) == LIBSSH2_ERROR_EAGAIN) { fprintf(stderr, "non-blocking init\n"); waitsocket(sock, session); /* now we wait */ } else { fprintf(stderr, "Unable to init SFTP session\n"); goto shutdown; } } } while (!sftp_session); tempstorage = fopen(storage, "wb"); if (!tempstorage) { fprintf(stderr, "Cannot open temp storage file %s\n", storage); goto shutdown; } /* Request a file via SFTP */ do { sftp_handle = libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0); if (!sftp_handle) { if (libssh2_session_last_errno(session) != LIBSSH2_ERROR_EAGAIN) { fprintf(stderr, "Unable to open file with SFTP: %ld\n", libssh2_sftp_last_error(sftp_session)); goto shutdown; } else { fprintf(stderr, "non-blocking open\n"); waitsocket(sock, session); /* now we wait */ } } } while (!sftp_handle); fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n"); if (sftp_handle) { ssize_t nread; libssh2_struct_stat_size total = 0; do { /* loop until we fail */ while ((nread = libssh2_sftp_read(sftp_handle, mem, sizeof(mem))) == LIBSSH2_ERROR_EAGAIN) { waitsocket(sock, session); /* now we wait */ } if (nread > 0) { total += nread; /* write to temporary storage area */ fwrite(mem, nread, 1, tempstorage); } else { break; } } while (1); } else { fprintf(stderr, "SFTP failed to open sftp source path: %s\n", dest); } libssh2_sftp_close(sftp_handle); fclose(tempstorage); tempstorage = fopen(storage, "rb"); if (!tempstorage) { /* weird, we cannot read the file we just wrote to... */ fprintf(stderr, "Cannot open %s for reading\n", storage); goto shutdown; } /* we're done downloading, now reverse the process and upload the temporarily stored data to the destination path */ do { sftp_handle = libssh2_sftp_open(sftp_session, dest, 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) { if (libssh2_session_last_errno(session) != LIBSSH2_ERROR_EAGAIN) { fprintf(stderr, "Unable to open file with SFTP: %ld\n", libssh2_sftp_last_error(sftp_session)); goto shutdown; } else { fprintf(stderr, "non-blocking open\n"); waitsocket(sock, session); /* now we wait */ } } } while (!sftp_handle); fprintf(stderr, "libssh2_sftp_open() is done, now send data!\n"); if (sftp_handle) { char* ptr; size_t nread; ssize_t nwritten; libssh2_struct_stat_size total = 0; do { nread = fread(mem, 1, sizeof(mem), tempstorage); if (nread <= 0) { /* end of file */ break; } ptr = mem; total += nread; do { /* write data in a loop until we block */ while ((nwritten = libssh2_sftp_write(sftp_handle, ptr, nread)) == LIBSSH2_ERROR_EAGAIN) { waitsocket(sock, session); } if (nwritten < 0) { break; } ptr += nwritten; nread -= nwritten; } while (nread); } while (nwritten > 0); fprintf(stderr, "SFTP upload done!\n"); } else { fprintf(stderr, "SFTP failed to open destination path: %s\n", dest); } libssh2_sftp_shutdown(sftp_session); shutdown: if (session) { libssh2_session_disconnect(session, "Normal Shutdown"); libssh2_session_free(session); } if (sock != LIBSSH2_INVALID_SOCKET) { shutdown(sock, 2); #ifdef WIN32 closesocket(sock); #else close(sock); #endif } if (tempstorage) fclose(tempstorage); fprintf(stderr, "all done\n"); libssh2_exit(); return 0; } int main(int argc, char ** argv) { char* cArgv[] = {(char*)"",/*(char*)"192.168.1.211",*/(char*)"headquarters\\ddd",(char*)"123456", (char*)"D:/output1.png",(char*)"d:/output-1.png",(char*)"D:/output2.png", }; int nArgc = sizeof(cArgv) / sizeof(*cArgv); sftp_rw_main(nArgc, cArgv); return(0); }
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