/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2007, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id: ssh.c,v 1.2 2007-03-15 19:22:13 andy Exp $ ***************************************************************************/ /* #define CURL_LIBSSH2_DEBUG */ #include "setup.h" #ifdef USE_LIBSSH2 #include #include #include #include #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef HAVE_TIME_H #include #endif #ifdef WIN32 #else /* probably some kind of unix */ #ifdef HAVE_SYS_SOCKET_H #include #endif #include #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #ifdef HAVE_UTSNAME_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef VMS #include #include #endif #endif #if (defined(NETWARE) && defined(__NOVELL_LIBC__)) #undef in_addr_t #define in_addr_t unsigned long #endif #include #include "urldata.h" #include "sendf.h" #include "easyif.h" /* for Curl_convert_... prototypes */ #include "if2ip.h" #include "hostip.h" #include "progress.h" #include "transfer.h" #include "escape.h" #include "http.h" /* for HTTP proxy tunnel stuff */ #include "ssh.h" #include "url.h" #include "speedcheck.h" #include "getinfo.h" #include "strtoofft.h" #include "strequal.h" #include "sslgen.h" #include "connect.h" #include "strerror.h" #include "memory.h" #include "inet_ntop.h" #include "select.h" #include "parsedate.h" /* for the week day and month names */ #include "sockaddr.h" /* required for Curl_sockaddr_storage */ #include "multiif.h" #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL) #include "inet_ntoa_r.h" #endif #define _MPRINTF_REPLACE /* use our functions only */ #include #if defined(WIN32) || defined(MSDOS) || defined(__EMX__) #define DIRSEP '\\' #else #define DIRSEP '/' #endif #define _MPRINTF_REPLACE /* use our functions only */ #include /* The last #include file should be: */ #ifdef CURLDEBUG #include "memdebug.h" #endif #ifndef LIBSSH2_SFTP_S_IRUSR /* Here's a work-around for those of you who happend to run a libssh2 version that is 0.14 or older. We should remove this kludge as soon as we can require a more recent libssh2 release. */ #ifndef S_IRGRP #define S_IRGRP 0 #endif #ifndef S_IROTH #define S_IROTH 0 #endif #define LIBSSH2_SFTP_S_IRUSR S_IRUSR #define LIBSSH2_SFTP_S_IWUSR S_IWUSR #define LIBSSH2_SFTP_S_IRGRP S_IRGRP #define LIBSSH2_SFTP_S_IROTH S_IROTH #define LIBSSH2_SFTP_S_IRUSR S_IRUSR #define LIBSSH2_SFTP_S_IWUSR S_IWUSR #define LIBSSH2_SFTP_S_IRGRP S_IRGRP #define LIBSSH2_SFTP_S_IROTH S_IROTH #define LIBSSH2_SFTP_S_IFMT S_IFMT #define LIBSSH2_SFTP_S_IFDIR S_IFDIR #define LIBSSH2_SFTP_S_IFLNK S_IFLNK #define LIBSSH2_SFTP_S_IFSOCK S_IFSOCK #define LIBSSH2_SFTP_S_IFCHR S_IFCHR #define LIBSSH2_SFTP_S_IFBLK S_IFBLK #define LIBSSH2_SFTP_S_IXUSR S_IXUSR #define LIBSSH2_SFTP_S_IWGRP S_IWGRP #define LIBSSH2_SFTP_S_IXGRP S_IXGRP #define LIBSSH2_SFTP_S_IWOTH S_IWOTH #define LIBSSH2_SFTP_S_IXOTH S_IXOTH #endif static LIBSSH2_ALLOC_FUNC(libssh2_malloc); static LIBSSH2_REALLOC_FUNC(libssh2_realloc); static LIBSSH2_FREE_FUNC(libssh2_free); static void kbd_callback(const char *name, int name_len, const char *instruction, int instruction_len, int num_prompts, const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts, LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses, void **abstract) { struct SSHPROTO *ssh = (struct SSHPROTO *)*abstract; #ifdef CURL_LIBSSH2_DEBUG fprintf(stderr, "name=%s\n", name); fprintf(stderr, "name_len=%d\n", name_len); fprintf(stderr, "instruction=%s\n", instruction); fprintf(stderr, "instruction_len=%d\n", instruction_len); fprintf(stderr, "num_prompts=%d\n", num_prompts); #else (void)name; (void)name_len; (void)instruction; (void)instruction_len; #endif /* CURL_LIBSSH2_DEBUG */ if (num_prompts == 1) { responses[0].text = strdup(ssh->passwd); responses[0].length = strlen(ssh->passwd); } (void)prompts; (void)abstract; } /* kbd_callback */ static CURLcode libssh2_error_to_CURLE(struct connectdata *conn) { int errorcode; struct SSHPROTO *scp = conn->data->reqdata.proto.ssh; /* Get the libssh2 error code and string */ errorcode = libssh2_session_last_error(scp->ssh_session, &scp->errorstr, NULL, 0); if (errorcode == LIBSSH2_FX_OK) return CURLE_OK; infof(conn->data, "libssh2 error %d, '%s'\n", errorcode, scp->errorstr); /* TODO: map some of the libssh2 errors to the more appropriate CURLcode error code, and possibly add a few new SSH-related one. We must however not return or even depend on libssh2 errors in the public libcurl API */ return CURLE_SSH; } static LIBSSH2_ALLOC_FUNC(libssh2_malloc) { return malloc(count); (void)abstract; } static LIBSSH2_REALLOC_FUNC(libssh2_realloc) { return realloc(ptr, count); (void)abstract; } static LIBSSH2_FREE_FUNC(libssh2_free) { free(ptr); (void)abstract; } static CURLcode ssh_init(struct connectdata *conn) { struct SessionHandle *data = conn->data; struct SSHPROTO *ssh; if (data->reqdata.proto.ssh) return CURLE_OK; ssh = (struct SSHPROTO *)calloc(sizeof(struct SSHPROTO), 1); if (!ssh) return CURLE_OUT_OF_MEMORY; data->reqdata.proto.ssh = ssh; /* get some initial data into the ssh struct */ ssh->bytecountp = &data->reqdata.keep.bytecount; /* no need to duplicate them, this connectdata struct won't change */ ssh->user = conn->user; ssh->passwd = conn->passwd; ssh->errorstr = NULL; ssh->ssh_session = NULL; ssh->ssh_channel = NULL; ssh->sftp_session = NULL; ssh->sftp_handle = NULL; return CURLE_OK; } /* * Curl_ssh_connect() gets called from Curl_protocol_connect() to allow us to * do protocol-specific actions at connect-time. */ CURLcode Curl_ssh_connect(struct connectdata *conn, bool *done) { int i; struct SSHPROTO *ssh; const char *fingerprint; const char *authlist; char *home; char rsa_pub[PATH_MAX]; char rsa[PATH_MAX]; char tempHome[PATH_MAX]; curl_socket_t sock; char *real_path; char *working_path; int working_path_len; bool authed = FALSE; CURLcode result; struct SessionHandle *data = conn->data; rsa_pub[0] = rsa[0] = '\0'; result = ssh_init(conn); if (result) return result; ssh = data->reqdata.proto.ssh; working_path = curl_easy_unescape(data, data->reqdata.path, 0, &working_path_len); if (!working_path) return CURLE_OUT_OF_MEMORY; #ifdef CURL_LIBSSH2_DEBUG if (ssh->user) { infof(data, "User: %s\n", ssh->user); } if (ssh->passwd) { infof(data, "Password: %s\n", ssh->passwd); } #endif /* CURL_LIBSSH2_DEBUG */ sock = conn->sock[FIRSTSOCKET]; ssh->ssh_session = libssh2_session_init_ex(libssh2_malloc, libssh2_free, libssh2_realloc, ssh); if (ssh->ssh_session == NULL) { failf(data, "Failure initialising ssh session\n"); Curl_safefree(ssh->path); return CURLE_FAILED_INIT; } #ifdef CURL_LIBSSH2_DEBUG infof(data, "SSH socket: %d\n", sock); #endif /* CURL_LIBSSH2_DEBUG */ if (libssh2_session_startup(ssh->ssh_session, sock)) { failf(data, "Failure establishing ssh session\n"); libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; Curl_safefree(ssh->path); return CURLE_FAILED_INIT; } /* * Before we authenticate we should check the hostkey's fingerprint against * our known hosts. How that is handled (reading from file, whatever) is * up to us. As for know not much is implemented, besides showing how to * get the fingerprint. */ fingerprint = libssh2_hostkey_hash(ssh->ssh_session, LIBSSH2_HOSTKEY_HASH_MD5); #ifdef CURL_LIBSSH2_DEBUG /* The fingerprint points to static storage (!), don't free() it. */ infof(data, "Fingerprint: "); for (i = 0; i < 16; i++) { infof(data, "%02X ", (unsigned char) fingerprint[i]); } infof(data, "\n"); #endif /* CURL_LIBSSH2_DEBUG */ /* TBD - methods to check the host keys need to be done */ /* * Figure out authentication methods * NB: As soon as we have provided a username to an openssh server we must * never change it later. Thus, always specify the correct username here, * even though the libssh2 docs kind of indicate that it should be possible * to get a 'generic' list (not user-specific) of authentication methods, * presumably with a blank username. That won't work in my experience. * So always specify it here. */ authlist = libssh2_userauth_list(ssh->ssh_session, ssh->user, strlen(ssh->user)); /* * Check the supported auth types in the order I feel is most secure with the * requested type of authentication */ if ((data->set.ssh_auth_types & CURLSSH_AUTH_PUBLICKEY) && (strstr(authlist, "publickey") != NULL)) { /* To ponder about: should really the lib be messing about with the HOME environment variable etc? */ home = curl_getenv("HOME"); if (data->set.ssh_public_key) snprintf(rsa_pub, sizeof(rsa_pub), "%s", data->set.ssh_public_key); else if (home) snprintf(rsa_pub, sizeof(rsa_pub), "%s/.ssh/id_dsa.pub", home); if (data->set.ssh_private_key) snprintf(rsa, sizeof(rsa), "%s", data->set.ssh_private_key); else if (home) snprintf(rsa, sizeof(rsa), "%s/.ssh/id_dsa", home); curl_free(home); if (rsa_pub[0]) { /* The function below checks if the files exists, no need to stat() here. */ if (libssh2_userauth_publickey_fromfile(ssh->ssh_session, ssh->user, rsa_pub, rsa, "") == 0) { authed = TRUE; } } } if (!authed && (data->set.ssh_auth_types & CURLSSH_AUTH_PASSWORD) && (strstr(authlist, "password") != NULL)) { if (!libssh2_userauth_password(ssh->ssh_session, ssh->user, ssh->passwd)) authed = TRUE; } if (!authed && (data->set.ssh_auth_types & CURLSSH_AUTH_HOST) && (strstr(authlist, "hostbased") != NULL)) { } if (!authed && (data->set.ssh_auth_types & CURLSSH_AUTH_KEYBOARD) && (strstr(authlist, "keyboard-interactive") != NULL)) { /* Authentication failed. Continue with keyboard-interactive now. */ if (libssh2_userauth_keyboard_interactive_ex(ssh->ssh_session, ssh->user, strlen(ssh->user), &kbd_callback) == 0) { authed = TRUE; } } if (!authed) { failf(data, "Authentication failure\n"); libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; Curl_safefree(ssh->path); return CURLE_FAILED_INIT; } /* * At this point we have an authenticated ssh session. */ conn->sockfd = sock; conn->writesockfd = CURL_SOCKET_BAD; if (conn->protocol == PROT_SFTP) { /* * Start the libssh2 sftp session */ ssh->sftp_session = libssh2_sftp_init(ssh->ssh_session); if (ssh->sftp_session == NULL) { failf(data, "Failure initialising sftp session\n"); libssh2_sftp_shutdown(ssh->sftp_session); ssh->sftp_session = NULL; libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; return CURLE_FAILED_INIT; } /* * Get the "home" directory */ i = libssh2_sftp_realpath(ssh->sftp_session, ".", tempHome, PATH_MAX-1); if (i > 0) { /* It seems that this string is not always NULL terminated */ tempHome[i] = '\0'; ssh->homedir = (char *)strdup(tempHome); if (!ssh->homedir) { libssh2_sftp_shutdown(ssh->sftp_session); ssh->sftp_session = NULL; libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; return CURLE_OUT_OF_MEMORY; } } else { /* Return the error type */ i = libssh2_sftp_last_error(ssh->sftp_session); DEBUGF(infof(data, "error = %d\n", i)); } } /* Check for /~/ , indicating realative to the users home directory */ if (conn->protocol == PROT_SCP) { real_path = (char *)malloc(working_path_len+1); if (real_path == NULL) { Curl_safefree(working_path); libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; return CURLE_OUT_OF_MEMORY; } if (working_path[1] == '~') /* It is referenced to the home directory, so strip the leading '/' */ memcpy(real_path, working_path+1, 1 + working_path_len-1); else memcpy(real_path, working_path, 1 + working_path_len); } else if (conn->protocol == PROT_SFTP) { if (working_path[1] == '~') { real_path = (char *)malloc(strlen(ssh->homedir) + working_path_len + 1); if (real_path == NULL) { libssh2_sftp_shutdown(ssh->sftp_session); ssh->sftp_session = NULL; libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; Curl_safefree(working_path); return CURLE_OUT_OF_MEMORY; } /* It is referenced to the home directory, so strip the leading '/' */ memcpy(real_path, ssh->homedir, strlen(ssh->homedir)); real_path[strlen(ssh->homedir)] = '/'; real_path[strlen(ssh->homedir)+1] = '\0'; if (working_path_len > 3) { memcpy(real_path+strlen(ssh->homedir)+1, working_path + 3, 1 + working_path_len -3); } } else { real_path = (char *)malloc(working_path_len+1); if (real_path == NULL) { libssh2_session_free(ssh->ssh_session); ssh->ssh_session = NULL; Curl_safefree(working_path); return CURLE_OUT_OF_MEMORY; } memcpy(real_path, working_path, 1+working_path_len); } } else return CURLE_FAILED_INIT; Curl_safefree(working_path); ssh->path = real_path; *done = TRUE; return CURLE_OK; } CURLcode Curl_scp_do(struct connectdata *conn, bool *done) { struct stat sb; struct SSHPROTO *scp = conn->data->reqdata.proto.ssh; CURLcode res = CURLE_OK; *done = TRUE; /* unconditionally */ if (conn->data->set.upload) { /* * NOTE!!! libssh2 requires that the destination path is a full path * that includes the destination file and name OR ends in a "/" . * If this is not done the destination file will be named the * same name as the last directory in the path. */ scp->ssh_channel = libssh2_scp_send_ex(scp->ssh_session, scp->path, LIBSSH2_SFTP_S_IRUSR| LIBSSH2_SFTP_S_IWUSR| LIBSSH2_SFTP_S_IRGRP| LIBSSH2_SFTP_S_IROTH, conn->data->set.infilesize, 0, 0); if (!scp->ssh_channel) return CURLE_FAILED_INIT; /* upload data */ res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL); } else { /* * We must check the remote file, if it is a directory no vaules will * be set in sb */ curl_off_t bytecount; memset(&sb, 0, sizeof(struct stat)); scp->ssh_channel = libssh2_scp_recv(scp->ssh_session, scp->path, &sb); if (!scp->ssh_channel) { if ((sb.st_mode == 0) && (sb.st_atime == 0) && (sb.st_mtime == 0) && (sb.st_size == 0)) { /* Since sb is still empty, it is likely the file was not found */ return CURLE_REMOTE_FILE_NOT_FOUND; } return libssh2_error_to_CURLE(conn); } /* download data */ bytecount = (curl_off_t) sb.st_size; conn->data->reqdata.maxdownload = (curl_off_t) sb.st_size; res = Curl_setup_transfer(conn, FIRSTSOCKET, bytecount, FALSE, NULL, -1, NULL); } return res; } CURLcode Curl_scp_done(struct connectdata *conn, CURLcode status, bool premature) { struct SSHPROTO *scp = conn->data->reqdata.proto.ssh; (void)premature; /* not used */ Curl_safefree(scp->path); scp->path = NULL; if (scp->ssh_channel) { if (libssh2_channel_close(scp->ssh_channel) < 0) { infof(conn->data, "Failed to stop libssh2 channel subsystem\n"); } } if (scp->ssh_session) { libssh2_session_disconnect(scp->ssh_session, "Shutdown"); libssh2_session_free(scp->ssh_session); scp->ssh_session = NULL; } free(conn->data->reqdata.proto.ssh); conn->data->reqdata.proto.ssh = NULL; Curl_pgrsDone(conn); (void)status; /* unused */ return CURLE_OK; } /* return number of received (decrypted) bytes */ ssize_t Curl_scp_send(struct connectdata *conn, int sockindex, void *mem, size_t len) { ssize_t nwrite; /* libssh2_channel_write() returns int * * NOTE: we should not store nor rely on connection-related data to be * in the SessionHandle struct */ nwrite = (ssize_t) libssh2_channel_write(conn->data->reqdata.proto.ssh->ssh_channel, mem, len); (void)sockindex; return nwrite; } /* * If the read would block (EWOULDBLOCK) we return -1. Otherwise we return * a regular CURLcode value. */ ssize_t Curl_scp_recv(struct connectdata *conn, int sockindex, char *mem, size_t len) { ssize_t nread; /* libssh2_channel_read() returns int * * NOTE: we should not store nor rely on connection-related data to be * in the SessionHandle struct */ nread = (ssize_t) libssh2_channel_read(conn->data->reqdata.proto.ssh->ssh_channel, mem, len); (void)sockindex; return nread; } /* * =============== SFTP =============== */ CURLcode Curl_sftp_do(struct connectdata *conn, bool *done) { LIBSSH2_SFTP_ATTRIBUTES attrs; struct SSHPROTO *sftp = conn->data->reqdata.proto.ssh; CURLcode res = CURLE_OK; struct SessionHandle *data = conn->data; curl_off_t bytecount = 0; char *buf = data->state.buffer; *done = TRUE; /* unconditionally */ if (data->set.upload) { /* * NOTE!!! libssh2 requires that the destination path is a full path * that includes the destination file and name OR ends in a "/" . * If this is not done the destination file will be named the * same name as the last directory in the path. */ sftp->sftp_handle = libssh2_sftp_open(sftp->sftp_session, sftp->path, LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT, LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR| LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH); if (!sftp->sftp_handle) return CURLE_FAILED_INIT; /* upload data */ res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL); } else { if (sftp->path[strlen(sftp->path)-1] == '/') { /* * This is a directory that we are trying to get, so produce a * directory listing * * **BLOCKING behaviour** This should be made into a state machine and * get a separate function called from Curl_sftp_recv() when there is * data to read from the network, instead of "hanging" here. */ char filename[PATH_MAX+1]; int len, totalLen, currLen; char *line; sftp->sftp_handle = libssh2_sftp_opendir(sftp->sftp_session, sftp->path); if (!sftp->sftp_handle) return CURLE_SSH; while ((len = libssh2_sftp_readdir(sftp->sftp_handle, filename, PATH_MAX, &attrs)) > 0) { filename[len] = '\0'; if (data->set.ftp_list_only) { if ((attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) && ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFDIR)) { infof(data, "%s\n", filename); } } else { totalLen = 80 + len; line = (char *)malloc(totalLen); if (!line) return CURLE_OUT_OF_MEMORY; if (!(attrs.flags & LIBSSH2_SFTP_ATTR_UIDGID)) attrs.uid = attrs.gid =0; currLen = snprintf(line, totalLen, "---------- 1 %5d %5d", attrs.uid, attrs.gid); if (attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) { if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFDIR) { line[0] = 'd'; } else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFLNK) { line[0] = 'l'; } else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFSOCK) { line[0] = 's'; } else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFCHR) { line[0] = 'c'; } else if ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFBLK) { line[0] = 'b'; } if (attrs.permissions & LIBSSH2_SFTP_S_IRUSR) { line[1] = 'r'; } if (attrs.permissions & LIBSSH2_SFTP_S_IWUSR) { line[2] = 'w'; } if (attrs.permissions & LIBSSH2_SFTP_S_IXUSR) { line[3] = 'x'; } if (attrs.permissions & LIBSSH2_SFTP_S_IRGRP) { line[4] = 'r'; } if (attrs.permissions & LIBSSH2_SFTP_S_IWGRP) { line[5] = 'w'; } if (attrs.permissions & LIBSSH2_SFTP_S_IXGRP) { line[6] = 'x'; } if (attrs.permissions & LIBSSH2_SFTP_S_IROTH) { line[7] = 'r'; } if (attrs.permissions & LIBSSH2_SFTP_S_IWOTH) { line[8] = 'w'; } if (attrs.permissions & LIBSSH2_SFTP_S_IXOTH) { line[9] = 'x'; } } if (attrs.flags & LIBSSH2_SFTP_ATTR_SIZE) { currLen += snprintf(line+currLen, totalLen-currLen, "%11lld", attrs.filesize); } if (attrs.flags & LIBSSH2_SFTP_ATTR_ACMODTIME) { const char *months[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; struct tm *nowParts; time_t now, remoteTime; now = time(NULL); remoteTime = (time_t)attrs.mtime; nowParts = localtime(&remoteTime); if ((time_t)attrs.mtime > (now - (3600 * 24 * 180))) { currLen += snprintf(line+currLen, totalLen-currLen, " %s %2d %2d:%02d", months[nowParts->tm_mon], nowParts->tm_mday, nowParts->tm_hour, nowParts->tm_min); } else { currLen += snprintf(line+currLen, totalLen-currLen, " %s %2d %5d", months[nowParts->tm_mon], nowParts->tm_mday, 1900+nowParts->tm_year); } } currLen += snprintf(line+currLen, totalLen-currLen, " %s", filename); if ((attrs.flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) && ((attrs.permissions & LIBSSH2_SFTP_S_IFMT) == LIBSSH2_SFTP_S_IFLNK)) { char linkPath[PATH_MAX + 1]; snprintf(linkPath, PATH_MAX, "%s%s", sftp->path, filename); len = libssh2_sftp_readlink(sftp->sftp_session, linkPath, filename, PATH_MAX); line = realloc(line, totalLen + 4 + len); if (!line) return CURLE_OUT_OF_MEMORY; currLen += snprintf(line+currLen, totalLen-currLen, " -> %s", filename); } currLen += snprintf(line+currLen, totalLen-currLen, "\n"); res = Curl_client_write(conn, CLIENTWRITE_BODY, line, 0); free(line); } } libssh2_sftp_closedir(sftp->sftp_handle); sftp->sftp_handle = NULL; /* no data to transfer */ res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); } else { /* * Work on getting the specified file */ sftp->sftp_handle = libssh2_sftp_open(sftp->sftp_session, sftp->path, LIBSSH2_FXF_READ, LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR| LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH); if (!sftp->sftp_handle) return CURLE_SSH; if (libssh2_sftp_stat(sftp->sftp_session, sftp->path, &attrs)) { /* * libssh2_sftp_open() didn't return an error, so maybe the server * just doesn't support stat() */ data->reqdata.size = -1; data->reqdata.maxdownload = -1; } else { data->reqdata.size = attrs.filesize; data->reqdata.maxdownload = attrs.filesize; Curl_pgrsSetDownloadSize(data, attrs.filesize); } Curl_pgrsTime(data, TIMER_STARTTRANSFER); /* Now download data. The libssh2 0.14 doesn't offer any way to do this without using this BLOCKING approach, so here's room for improvement once libssh2 can return EWOULDBLOCK to us. */ #if 0 /* code left here just because this is what this function will use the day libssh2 is improved */ res = Curl_setup_transfer(conn, FIRSTSOCKET, bytecount, FALSE, NULL, -1, NULL); #endif while (res == CURLE_OK) { size_t nread; /* NOTE: most *read() functions return ssize_t but this returns size_t which normally is unsigned! */ nread = libssh2_sftp_read(data->reqdata.proto.ssh->sftp_handle, buf, BUFSIZE-1); if (nread > 0) buf[nread] = 0; /* this check can be changed to a <= 0 when nread is changed to a signed variable type */ if ((nread == 0) || (nread == (size_t)~0)) break; bytecount += nread; res = Curl_client_write(conn, CLIENTWRITE_BODY, buf, nread); if(res) return res; Curl_pgrsSetDownloadCounter(data, bytecount); if(Curl_pgrsUpdate(conn)) res = CURLE_ABORTED_BY_CALLBACK; else { struct timeval now = Curl_tvnow(); res = Curl_speedcheck(data, now); } } if(Curl_pgrsUpdate(conn)) res = CURLE_ABORTED_BY_CALLBACK; /* no (more) data to transfer */ res = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); } } return res; } CURLcode Curl_sftp_done(struct connectdata *conn, CURLcode status, bool premature) { struct SSHPROTO *sftp = conn->data->reqdata.proto.ssh; (void)premature; /* not used */ Curl_safefree(sftp->path); sftp->path = NULL; Curl_safefree(sftp->homedir); sftp->homedir = NULL; if (sftp->sftp_handle) { if (libssh2_sftp_close(sftp->sftp_handle) < 0) { infof(conn->data, "Failed to close libssh2 file\n"); } } if (sftp->sftp_session) { if (libssh2_sftp_shutdown(sftp->sftp_session) < 0) { infof(conn->data, "Failed to stop libssh2 sftp subsystem\n"); } } if (sftp->ssh_channel) { if (libssh2_channel_close(sftp->ssh_channel) < 0) { infof(conn->data, "Failed to stop libssh2 channel subsystem\n"); } } if (sftp->ssh_session) { libssh2_session_disconnect(sftp->ssh_session, "Shutdown"); libssh2_session_free(sftp->ssh_session); sftp->ssh_session = NULL; } free(conn->data->reqdata.proto.ssh); conn->data->reqdata.proto.ssh = NULL; Curl_pgrsDone(conn); (void)status; /* unused */ return CURLE_OK; } /* return number of received (decrypted) bytes */ ssize_t Curl_sftp_send(struct connectdata *conn, int sockindex, void *mem, size_t len) { ssize_t nwrite; /* libssh2_sftp_write() returns size_t !*/ nwrite = (ssize_t) libssh2_sftp_write(conn->data->reqdata.proto.ssh->sftp_handle, mem, len); (void)sockindex; return nwrite; } /* * If the read would block (EWOULDBLOCK) we return -1. Otherwise we return * a regular CURLcode value. */ ssize_t Curl_sftp_recv(struct connectdata *conn, int sockindex, char *mem, size_t len) { ssize_t nread; /* libssh2_sftp_read() returns size_t !*/ nread = (ssize_t) libssh2_sftp_read(conn->data->reqdata.proto.ssh->sftp_handle, mem, len); (void)sockindex; return nread; } #endif /* USE_LIBSSH2 */