* psftp.c: front end for PSFTP.
*/
+#include <windows.h>
+
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
+#define PUTTY_DO_GLOBALS
+#include "putty.h"
+#include "storage.h"
+#include "ssh.h"
#include "sftp.h"
#include "int64.h"
-#define smalloc malloc
-#define srealloc realloc
-#define sfree free
-
/* ----------------------------------------------------------------------
* String handling routines.
*/
*/
char *canonify(char *name) {
char *fullname, *canonname;
+
if (name[0] == '/') {
fullname = dupstr(name);
} else {
- fullname = dupcat(pwd, "/", name, NULL);
+ char *slash;
+ if (pwd[strlen(pwd)-1] == '/')
+ slash = "";
+ else
+ slash = "/";
+ fullname = dupcat(pwd, slash, name, NULL);
}
- canonname = fxp_realpath(name);
+
+ canonname = fxp_realpath(fullname);
+
if (canonname) {
sfree(fullname);
return canonname;
*/
{"bye", sftp_cmd_quit},
{"cd", sftp_cmd_cd},
+ {"dir", sftp_cmd_ls},
{"exit", sftp_cmd_quit},
{"get", sftp_cmd_get},
{"ls", sftp_cmd_ls},
if (cmd->obey(cmd) < 0)
break;
}
+}
- /* ------------------------------------------------------------------
- * We've received an exit command. Tidy up and leave.
+/* ----------------------------------------------------------------------
+ * Dirty bits: integration with PuTTY.
+ */
+
+static int verbose = 0;
+
+void verify_ssh_host_key(char *host, int port, char *keytype,
+ char *keystr, char *fingerprint) {
+ int ret;
+
+ static const char absentmsg[] =
+ "The server's host key is not cached in the registry. You\n"
+ "have no guarantee that the server is the computer you\n"
+ "think it is.\n"
+ "The server's key fingerprint is:\n"
+ "%s\n"
+ "If you trust this host, enter \"y\" to add the key to\n"
+ "PuTTY's cache and carry on connecting.\n"
+ "If you do not trust this host, enter \"n\" to abandon the\n"
+ "connection.\n"
+ "Continue connecting? (y/n) ";
+
+ static const char wrongmsg[] =
+ "WARNING - POTENTIAL SECURITY BREACH!\n"
+ "The server's host key does not match the one PuTTY has\n"
+ "cached in the registry. This means that either the\n"
+ "server administrator has changed the host key, or you\n"
+ "have actually connected to another computer pretending\n"
+ "to be the server.\n"
+ "The new key fingerprint is:\n"
+ "%s\n"
+ "If you were expecting this change and trust the new key,\n"
+ "enter Yes to update PuTTY's cache and continue connecting.\n"
+ "If you want to carry on connecting but without updating\n"
+ "the cache, enter No.\n"
+ "If you want to abandon the connection completely, press\n"
+ "Return to cancel. Pressing Return is the ONLY guaranteed\n"
+ "safe choice.\n"
+ "Update cached key? (y/n, Return cancels connection) ";
+
+ static const char abandoned[] = "Connection abandoned.\n";
+
+ char line[32];
+
+ /*
+ * Verify the key against the registry.
+ */
+ ret = verify_host_key(host, port, keytype, keystr);
+
+ if (ret == 0) /* success - key matched OK */
+ return;
+ if (ret == 2) { /* key was different */
+ fprintf(stderr, wrongmsg, fingerprint);
+ if (fgets(line, sizeof(line), stdin) &&
+ line[0] != '\0' && line[0] != '\n') {
+ if (line[0] == 'y' || line[0] == 'Y')
+ store_host_key(host, port, keytype, keystr);
+ } else {
+ fprintf(stderr, abandoned);
+ exit(0);
+ }
+ }
+ if (ret == 1) { /* key was absent */
+ fprintf(stderr, absentmsg, fingerprint);
+ if (fgets(line, sizeof(line), stdin) &&
+ (line[0] == 'y' || line[0] == 'Y'))
+ store_host_key(host, port, keytype, keystr);
+ else {
+ fprintf(stderr, abandoned);
+ exit(0);
+ }
+ }
+}
+
+/*
+ * Print an error message and perform a fatal exit.
+ */
+void fatalbox(char *fmt, ...)
+{
+ char str[0x100]; /* Make the size big enough */
+ va_list ap;
+ va_start(ap, fmt);
+ strcpy(str, "Fatal:");
+ vsprintf(str+strlen(str), fmt, ap);
+ va_end(ap);
+ strcat(str, "\n");
+ fprintf(stderr, str);
+
+ exit(1);
+}
+void connection_fatal(char *fmt, ...)
+{
+ char str[0x100]; /* Make the size big enough */
+ va_list ap;
+ va_start(ap, fmt);
+ strcpy(str, "Fatal:");
+ vsprintf(str+strlen(str), fmt, ap);
+ va_end(ap);
+ strcat(str, "\n");
+ fprintf(stderr, str);
+
+ exit(1);
+}
+
+void logevent(char *string) { }
+
+void ldisc_send(char *buf, int len) {
+ /*
+ * This is only here because of the calls to ldisc_send(NULL,
+ * 0) in ssh.c. Nothing in PSFTP actually needs to use the
+ * ldisc as an ldisc. So if we get called with any real data, I
+ * want to know about it.
*/
- io_finish();
+ assert(len == 0);
+}
+
+/*
+ * Be told what socket we're supposed to be using.
+ */
+static SOCKET sftp_ssh_socket;
+char *do_select(SOCKET skt, int startup) {
+ if (startup)
+ sftp_ssh_socket = skt;
+ else
+ sftp_ssh_socket = INVALID_SOCKET;
+ return NULL;
}
+extern int select_result(WPARAM, LPARAM);
+
+/*
+ * Receive a block of data from the SSH link. Block until all data
+ * is available.
+ *
+ * To do this, we repeatedly call the SSH protocol module, with our
+ * own trap in from_backend() to catch the data that comes back. We
+ * do this until we have enough data.
+ */
+
+static unsigned char *outptr; /* where to put the data */
+static unsigned outlen; /* how much data required */
+static unsigned char *pending = NULL; /* any spare data */
+static unsigned pendlen=0, pendsize=0; /* length and phys. size of buffer */
+void from_backend(int is_stderr, char *data, int datalen) {
+ unsigned char *p = (unsigned char *)data;
+ unsigned len = (unsigned)datalen;
+
+ /*
+ * stderr data is just spouted to local stderr and otherwise
+ * ignored.
+ */
+ if (is_stderr) {
+ fwrite(data, 1, len, stderr);
+ return;
+ }
+
+ /*
+ * If this is before the real session begins, just return.
+ */
+ if (!outptr)
+ return;
+
+ if (outlen > 0) {
+ unsigned used = outlen;
+ if (used > len) used = len;
+ memcpy(outptr, p, used);
+ outptr += used; outlen -= used;
+ p += used; len -= used;
+ }
+
+ if (len > 0) {
+ if (pendsize < pendlen + len) {
+ pendsize = pendlen + len + 4096;
+ pending = (pending ? srealloc(pending, pendsize) :
+ smalloc(pendsize));
+ if (!pending)
+ fatalbox("Out of memory");
+ }
+ memcpy(pending+pendlen, p, len);
+ pendlen += len;
+ }
+}
+int sftp_recvdata(char *buf, int len) {
+ outptr = (unsigned char *)buf;
+ outlen = len;
+
+ /*
+ * See if the pending-input block contains some of what we
+ * need.
+ */
+ if (pendlen > 0) {
+ unsigned pendused = pendlen;
+ if (pendused > outlen)
+ pendused = outlen;
+ memcpy(outptr, pending, pendused);
+ memmove(pending, pending+pendused, pendlen-pendused);
+ outptr += pendused;
+ outlen -= pendused;
+ pendlen -= pendused;
+ if (pendlen == 0) {
+ pendsize = 0;
+ sfree(pending);
+ pending = NULL;
+ }
+ if (outlen == 0)
+ return 1;
+ }
+
+ while (outlen > 0) {
+ fd_set readfds;
+
+ FD_ZERO(&readfds);
+ FD_SET(sftp_ssh_socket, &readfds);
+ if (select(1, &readfds, NULL, NULL, NULL) < 0)
+ return 0; /* doom */
+ select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ);
+ }
+
+ return 1;
+}
+int sftp_senddata(char *buf, int len) {
+ back->send((unsigned char *)buf, len);
+ return 1;
+}
+
+/*
+ * Loop through the ssh connection and authentication process.
+ */
+static void ssh_sftp_init(void) {
+ if (sftp_ssh_socket == INVALID_SOCKET)
+ return;
+ while (!back->sendok()) {
+ fd_set readfds;
+ FD_ZERO(&readfds);
+ FD_SET(sftp_ssh_socket, &readfds);
+ if (select(1, &readfds, NULL, NULL, NULL) < 0)
+ return; /* doom */
+ select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ);
+ }
+}
+
+static char *password = NULL;
+static int get_password(const char *prompt, char *str, int maxlen)
+{
+ HANDLE hin, hout;
+ DWORD savemode, i;
+
+ if (password) {
+ static int tried_once = 0;
+
+ if (tried_once) {
+ return 0;
+ } else {
+ strncpy(str, password, maxlen);
+ str[maxlen-1] = '\0';
+ tried_once = 1;
+ return 1;
+ }
+ }
+
+ hin = GetStdHandle(STD_INPUT_HANDLE);
+ hout = GetStdHandle(STD_OUTPUT_HANDLE);
+ if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) {
+ fprintf(stderr, "Cannot get standard input/output handles\n");
+ exit(1);
+ }
+
+ GetConsoleMode(hin, &savemode);
+ SetConsoleMode(hin, (savemode & (~ENABLE_ECHO_INPUT)) |
+ ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT);
+
+ WriteFile(hout, prompt, strlen(prompt), &i, NULL);
+ ReadFile(hin, str, maxlen-1, &i, NULL);
+
+ SetConsoleMode(hin, savemode);
+
+ if ((int)i > maxlen) i = maxlen-1; else i = i - 2;
+ str[i] = '\0';
+
+ WriteFile(hout, "\r\n", 2, &i, NULL);
+
+ return 1;
+}
+
+/*
+ * Initialize the Win$ock driver.
+ */
+static void init_winsock(void)
+{
+ WORD winsock_ver;
+ WSADATA wsadata;
+
+ winsock_ver = MAKEWORD(1, 1);
+ if (WSAStartup(winsock_ver, &wsadata)) {
+ fprintf(stderr, "Unable to initialise WinSock");
+ exit(1);
+ }
+ if (LOBYTE(wsadata.wVersion) != 1 ||
+ HIBYTE(wsadata.wVersion) != 1) {
+ fprintf(stderr, "WinSock version is incompatible with 1.1");
+ exit(1);
+ }
+}
+
+/*
+ * Short description of parameters.
+ */
+static void usage(void)
+{
+ printf("PuTTY Secure File Transfer (SFTP) client\n");
+ printf("%s\n", ver);
+ printf("Usage: psftp [options] user@host\n");
+ printf("Options:\n");
+ printf(" -v show verbose messages\n");
+ printf(" -P port connect to specified port\n");
+ printf(" -pw passw login with specified password\n");
+ exit(1);
+}
+
+/*
+ * Main program. Parse arguments etc.
+ */
+int main(int argc, char *argv[])
+{
+ int i;
+ int portnumber = 0;
+ char *user, *host, *userhost, *realhost;
+ char *err;
+
+ flags = FLAG_STDERR;
+ ssh_get_password = &get_password;
+ init_winsock();
+ sk_init();
+
+ userhost = user = NULL;
+
+ for (i = 1; i < argc; i++) {
+ if (argv[i][0] != '-') {
+ if (userhost)
+ usage();
+ else
+ userhost = dupstr(argv[i]);
+ } else if (strcmp(argv[i], "-v") == 0) {
+ verbose = 1, flags |= FLAG_VERBOSE;
+ } else if (strcmp(argv[i], "-h") == 0 ||
+ strcmp(argv[i], "-?") == 0) {
+ usage();
+ } else if (strcmp(argv[i], "-l") == 0 && i+1 < argc) {
+ user = argv[++i];
+ } else if (strcmp(argv[i], "-P") == 0 && i+1 < argc) {
+ portnumber = atoi(argv[++i]);
+ } else if (strcmp(argv[i], "-pw") == 0 && i+1 < argc) {
+ password = argv[++i];
+ } else if (strcmp(argv[i], "--") == 0) {
+ i++;
+ break;
+ } else {
+ usage();
+ }
+ }
+ argc -= i;
+ argv += i;
+ back = NULL;
+
+ if (argc > 0 || !userhost)
+ usage();
+
+ /* Separate host and username */
+ host = userhost;
+ host = strrchr(host, '@');
+ if (host == NULL) {
+ host = userhost;
+ } else {
+ *host++ = '\0';
+ if (user) {
+ printf("psftp: multiple usernames specified; using \"%s\"\n", user);
+ } else
+ user = userhost;
+ }
+
+ /* Try to load settings for this host */
+ do_defaults(host, &cfg);
+ if (cfg.host[0] == '\0') {
+ /* No settings for this host; use defaults */
+ do_defaults(NULL, &cfg);
+ strncpy(cfg.host, host, sizeof(cfg.host)-1);
+ cfg.host[sizeof(cfg.host)-1] = '\0';
+ cfg.port = 22;
+ }
+
+ /* Set username */
+ if (user != NULL && user[0] != '\0') {
+ strncpy(cfg.username, user, sizeof(cfg.username)-1);
+ cfg.username[sizeof(cfg.username)-1] = '\0';
+ }
+ if (!cfg.username[0]) {
+ printf("login as: ");
+ if (!fgets(cfg.username, sizeof(cfg.username), stdin)) {
+ fprintf(stderr, "psftp: aborting\n");
+ exit(1);
+ } else {
+ int len = strlen(cfg.username);
+ if (cfg.username[len-1] == '\n')
+ cfg.username[len-1] = '\0';
+ }
+ }
+
+ if (cfg.protocol != PROT_SSH)
+ cfg.port = 22;
+
+ if (portnumber)
+ cfg.port = portnumber;
+
+ /* SFTP uses SSH2 by default always */
+ cfg.sshprot = 2;
+
+ /* Set up subsystem name. FIXME: fudge for SSH1. */
+ strcpy(cfg.remote_cmd, "sftp");
+ cfg.ssh_subsys = TRUE;
+ cfg.nopty = TRUE;
+
+ back = &ssh_backend;
+
+ err = back->init(cfg.host, cfg.port, &realhost);
+ if (err != NULL) {
+ fprintf(stderr, "ssh_init: %s", err);
+ return 1;
+ }
+ ssh_sftp_init();
+ if (verbose && realhost != NULL)
+ printf("Connected to %s\n", realhost);
-int main(void) {
- io_init();
do_sftp();
+
+ if (back != NULL && back->socket() != NULL) {
+ char ch;
+ back->special(TS_EOF);
+ sftp_recvdata(&ch, 1);
+ }
+ WSACleanup();
+ random_save_seed();
+
return 0;
}
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <assert.h>
-#include <unistd.h>
#include "int64.h"
#include "sftp.h"
}
/* ----------------------------------------------------------------------
- * Send and receive packet functions. FIXME: change for PuTTY.
+ * Send and receive packet functions.
*/
-int tossh, fromssh;
-int io_init(void) {
- int to[2], from[2];
- int pid;
-
- assert(pipe(to) == 0);
- assert(pipe(from) == 0);
- pid = fork();
- assert(pid >= 0);
- if (pid == 0) {
- /* We are child. Dup one end of each pipe to our std[io],
- * close other end, exec. */
- close(0); dup2(to[0], 0); close(to[1]);
- close(1); dup2(from[1], 1); close(from[0]);
- execl("/home/simon/src/openssh/openssh_cvs/prefix/bin/ssh", "ssh", "-2", "simon@localhost", "-s", "sftp", NULL);
- //execl("/root/ssh-research/ssh-2.4.0/apps/ssh/sftp-server2", "sftp-server2", NULL);
- //execl("/usr/lib/sftp-server", "sftp-server", NULL);
- assert(0); /* bomb out if not */
- } else {
- /* We are parent. Close wrong end of each pipe, assign to glob vars. */
- close(to[0]); tossh = to[1];
- close(from[1]); fromssh = from[0];
- }
-}
-int io_finish(void) {
- int pid, status;
- close(tossh);
- close(fromssh);
- pid = wait(&status);
-}
int sftp_send(struct sftp_packet *pkt) {
+ int ret;
char x[4];
PUT_32BIT(x, pkt->length);
- assert(4 == write(tossh, x, 4));
- assert(pkt->length = write(tossh, pkt->data, pkt->length));
+ ret = (sftp_senddata(x, 4) &&
+ sftp_senddata(pkt->data, pkt->length));
sftp_pkt_free(pkt);
+ return ret;
}
struct sftp_packet *sftp_recv(void) {
struct sftp_packet *pkt;
char x[4];
int p, ret;
- for (p = 0; p < 4 ;) {
- ret = read(fromssh, x+p, 4-p);
- assert(ret >= 0);
- if (ret == 0)
- return NULL;
- p += ret;
- }
+ if (!sftp_recvdata(x, 4))
+ return NULL;
pkt = smalloc(sizeof(struct sftp_packet));
pkt->savedpos = 0;
pkt->length = pkt->maxlen = GET_32BIT(x);
pkt->data = smalloc(pkt->length);
- for (p = 0; p < pkt->length ;) {
- ret = read(fromssh, pkt->data+p, pkt->length-p);
- assert(ret >= 0);
- if (ret == 0) {
- sftp_pkt_free(pkt);
- return NULL;
- }
- p += ret;
+ if (!sftp_recvdata(pkt->data, pkt->length)) {
+ sftp_pkt_free(pkt);
+ return NULL;
}
pkt->type = sftp_pkt_getbyte(pkt);
return -1;
}
-static int fxp_internal_error(char *msg) {
+static void fxp_internal_error(char *msg) {
fxp_error_message = msg;
fxp_errtype = -1;
}
id = sftp_pkt_getuint32(pktin);
if (id != 0xBCD) {
fxp_internal_error("request ID mismatch");
- return;
+ return -1;
}
if (pktin->type == SSH_FXP_DATA) {
char *str;
id = sftp_pkt_getuint32(pktin);
if (id != 0xABC) {
fxp_internal_error("request ID mismatch\n");
- return;
+ return NULL;
}
if (pktin->type == SSH_FXP_NAME) {
struct fxp_names *ret;
sftp_send(pktout);
pktin = sftp_recv();
id = sftp_pkt_getuint32(pktin);
+ if (id != 0xDCB) {
+ fxp_internal_error("request ID mismatch\n");
+ return NULL;
+ }
fxp_got_status(pktin);
return fxp_errtype == SSH_FX_OK;
}
projects / u / mdw / putty / commitdiff