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Make sftp_nonblock.c a non-blocking version of sftp.c, just like sftpdir.c

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This commit is contained in:
James Housley 2007-04-22 14:16:26 +00:00
parent 08fd7e259b
commit 3bd3eb35b3
2 changed files with 141 additions and 233 deletions
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4
example/simple/Makefile.am
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@ -1,7 +1,7 @@
AUTOMAKE_OPTIONS = foreign nostdinc AUTOMAKE_OPTIONS = foreign nostdinc
# samples # samples
noinst_PROGRAMS = ssh2 scp_nonblock sftp_nonblock sftp scp sftpdir sftpdir_nonblock noinst_PROGRAMS = ssh2 scp_nonblock sftp_nonblock sftp sftp_RW_nonblock scp sftpdir sftpdir_nonblock
INCLUDES = -I$(top_srcdir)/include INCLUDES = -I$(top_srcdir)/include
LDADD = $(top_builddir)/src/libssh2.la LDADD = $(top_builddir)/src/libssh2.la
@ -16,6 +16,8 @@ scp_nonblock_SOURCES = scp_nonblock.c
sftp_nonblock_SOURCES = sftp_nonblock.c sftp_nonblock_SOURCES = sftp_nonblock.c
sftp_RW_nonblock_SOURCES = sftp_RW_nonblock.c
sftpdir_nonblock_SOURCES = sftpdir_nonblock.c sftpdir_nonblock_SOURCES = sftpdir_nonblock.c
scp_SOURCES = scp.c scp_SOURCES = scp.c

370
example/simple/sftp_nonblock.c
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@ -1,12 +1,12 @@
/* /*
* $Id: sftp_nonblock.c,v 1.1 2007/02/02 16:21:20 bagder Exp $ * $Id: sftp_nonblock.c,v 1.2 2007/04/22 14:16:26 jehousley Exp $
* *
* Sample showing how to do SFTP transfers in a non-blocking manner. * Sample showing how to do SFTP transfers.
* *
* It will first download a given source file, store it locally and then * The sample code has default values for host name, user name, password
* upload the file again to a given destination file. * and path to copy, but you can specify them on the command line like:
* *
* Using the SFTP server running on 127.0.0.1 * "sftp 192.168.0.1 user password /tmp/secrets"
*/ */
#include <libssh2.h> #include <libssh2.h>
@ -16,266 +16,172 @@
# include <netinet/in.h> # include <netinet/in.h>
# include <sys/socket.h> # include <sys/socket.h>
# include <unistd.h> # include <unistd.h>
# include <arpa/inet.h>
#else #else
# include <winsock2.h> # include <winsock2.h>
#endif #endif
#include <sys/types.h> #include <sys/types.h>
#include <fcntl.h> #include <fcntl.h>
#include <errno.h> #include <errno.h>
#include <stdio.h> #include <stdio.h>
#include <ctype.h> #include <ctype.h>
#define STORAGE "/tmp/sftp-storage" /* this is the local file name this
example uses to store the downloaded
file in */
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
int sock, i, auth_pw = 1; unsigned long hostaddr;
struct sockaddr_in sin; int sock, i, auth_pw = 1;
const char *fingerprint; struct sockaddr_in sin;
LIBSSH2_SESSION *session; const char *fingerprint;
char *username=(char *)"username"; LIBSSH2_SESSION *session;
char *password=(char *)"password"; char *username=(char *)"username";
char *sftppath=(char *)"/tmp/TEST"; /* source path */ char *password=(char *)"password";
char *dest=(char *)"/tmp/TEST2"; /* destination path */ char *sftppath=(char *)"/tmp/TEST";
int rc; int rc;
LIBSSH2_SFTP *sftp_session; LIBSSH2_SFTP *sftp_session;
LIBSSH2_SFTP_HANDLE *sftp_handle; LIBSSH2_SFTP_HANDLE *sftp_handle;
FILE *tempstorage;
char mem[1000];
struct timeval timeout;
fd_set fd;
#ifdef WIN32 #ifdef WIN32
WSADATA wsadata; WSADATA wsadata;
WSAStartup(WINSOCK_VERSION, &wsadata); WSAStartup(WINSOCK_VERSION, &wsadata);
#endif #endif
/* Ultra basic "connect to port 22 on localhost" if (argc > 1) {
* The application is responsible for creating the socket establishing hostaddr = inet_addr(argv[1]);
* the connection } else {
*/ hostaddr = htonl(0x7F000001);
sock = socket(AF_INET, SOCK_STREAM, 0); }
sin.sin_family = AF_INET; if(argc > 2) {
sin.sin_port = htons(22); username = argv[2];
sin.sin_addr.s_addr = htonl(0x7F000001); }
if (connect(sock, (struct sockaddr*)(&sin), if(argc > 3) {
sizeof(struct sockaddr_in)) != 0) { password = argv[3];
fprintf(stderr, "failed to connect!\n"); }
return -1; if(argc > 4) {
} sftppath = argv[4];
}
/*
* The application code is responsible for creating the socket
* and establishing the connection
*/
sock = socket(AF_INET, SOCK_STREAM, 0);
/* We set the socket non-blocking. We do it after the connect just to sin.sin_family = AF_INET;
simplify the example code. */ 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;
}
/* We set the socket non-blocking. We do it after the connect just to
simplify the example code. */
#ifdef F_SETFL #ifdef F_SETFL
/* FIXME: this can/should be done in a more portable manner */ /* FIXME: this can/should be done in a more portable manner */
rc = fcntl(sock, F_GETFL, 0); rc = fcntl(sock, F_GETFL, 0);
fcntl(sock, F_SETFL, rc | O_NONBLOCK); fcntl(sock, F_SETFL, rc | O_NONBLOCK);
#else #else
#error "add support for setting the socket non-blocking here" #error "add support for setting the socket non-blocking here"
#endif #endif
/* Create a session instance /* Create a session instance
*/ */
session = libssh2_session_init(); session = libssh2_session_init();
if(!session) if(!session)
return -1; return -1;
/* ... start it up. This will trade welcome banners, exchange keys, /* ... start it up. This will trade welcome banners, exchange keys,
* and setup crypto, compression, and MAC layers * and setup crypto, compression, and MAC layers
*/ */
rc = libssh2_session_startup(session, sock); rc = libssh2_session_startup(session, sock);
if(rc) { if(rc) {
fprintf(stderr, "Failure establishing SSH session: %d\n", rc); fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
return -1; 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_MD5);
printf("Fingerprint: ");
for(i = 0; i < 16; i++) {
printf("%02X ", (unsigned char)fingerprint[i]);
}
printf("\n");
if (auth_pw) {
/* We could authenticate via password */
if (libssh2_userauth_password(session, username, password)) {
printf("Authentication by password failed.\n");
goto shutdown;
}
} else {
/* Or by public key */
if (libssh2_userauth_publickey_fromfile(session, username,
"/home/username/.ssh/id_rsa.pub",
"/home/username/.ssh/id_rsa",
password)) {
printf("\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;
}
/* Since we have set non-blocking, tell libssh2 we are non-blocking */
libssh2_sftp_set_blocking(sftp_session, 0);
fprintf(stderr, "libssh2_sftp_open()!\n");
/* Request a file via SFTP */
sftp_handle =
libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
if (!sftp_handle) {
fprintf(stderr, "Unable to open file with SFTP\n");
goto shutdown;
}
fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
do {
char mem[1024];
/* loop until we fail */
fprintf(stderr, "libssh2_sftp_read()!\n");
rc = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));
if (rc > 0) {
write(2, mem, rc);
} else {
break;
} }
} while (1);
/* At this point we havn't yet authenticated. The first thing to do libssh2_sftp_close(sftp_handle);
* is check the hostkey's fingerprint against our known hosts Your app libssh2_sftp_shutdown(sftp_session);
* 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_MD5);
printf("Fingerprint: ");
for(i = 0; i < 16; i++) {
printf("%02X ", (unsigned char)fingerprint[i]);
}
printf("\n");
if(argc > 1) {
username = argv[1];
}
if(argc > 2) {
password = argv[2];
}
if(argc > 3) {
sftppath = argv[3];
}
if(argc > 4) {
dest = argv[4];
}
tempstorage = fopen(STORAGE, "wb");
if(!tempstorage) {
printf("Can't open temp storage file %s\n", STORAGE);
goto shutdown;
}
if (auth_pw) {
/* We could authenticate via password */
if (libssh2_userauth_password(session, username, password)) {
printf("Authentication by password failed.\n");
goto shutdown;
}
} else {
/* Or by public key */
if (libssh2_userauth_publickey_fromfile(session, username,
"/home/username/.ssh/id_rsa.pub",
"/home/username/.ssh/id_rsa",
password)) {
printf("\tAuthentication by public key failed\n");
goto shutdown;
}
}
sftp_session = libssh2_sftp_init(session);
if (!sftp_session) {
fprintf(stderr, "Unable to init SFTP session\n");
goto shutdown;
}
/* Request a file via SFTP */
sftp_handle =
libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
if (!sftp_handle) {
fprintf(stderr, "Unable to open file with SFTP\n");
goto shutdown;
}
fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
do {
do {
/* read in a loop until we block */
rc = libssh2_sftp_readnb(sftp_handle, mem,
sizeof(mem));
fprintf(stderr, "libssh2_sftp_read returned %d\n",
rc);
if(rc > 0) {
/* write to stderr */
write(2, mem, rc);
/* write to temporary storage area */
fwrite(mem, rc, 1, tempstorage);
}
} while (rc > 0);
if(rc != LIBSSH2SFTP_EAGAIN) {
/* error or end of file */
break;
}
timeout.tv_sec = 10;
timeout.tv_usec = 0;
FD_ZERO(&fd);
FD_SET(sock, &fd);
/* wait for readable or writeable */
rc = select(sock+1, &fd, &fd, NULL, &timeout);
if(rc <= 0) {
/* negative is error
0 is timeout */
fprintf(stderr, "SFTP download timed out: %d\n", rc);
break;
}
} while (1);
libssh2_sftp_close(sftp_handle);
fclose(tempstorage);
tempstorage = fopen(STORAGE, "rb");
if(!tempstorage) {
/* weird, we can't read the file we just wrote to... */
fprintf(stderr, "can't 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 */
sftp_handle =
libssh2_sftp_open(sftp_session, dest,
LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT,
LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|
LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);
if(sftp_handle) {
size_t nread;
char *ptr;
do {
nread = fread(mem, 1, sizeof(mem), tempstorage);
if(nread <= 0) {
/* end of file */
break;
}
ptr = mem;
do {
/* write data in a loop until we block */
rc = libssh2_sftp_writenb(sftp_handle, ptr,
nread);
ptr += rc;
nread -= nread;
} while (rc > 0);
if(rc != LIBSSH2SFTP_EAGAIN) {
/* error or end of file */
break;
}
timeout.tv_sec = 10;
timeout.tv_usec = 0;
FD_ZERO(&fd);
FD_SET(sock, &fd);
/* wait for readable or writeable */
rc = select(sock+1, &fd, &fd, NULL, &timeout);
if(rc <= 0) {
/* negative is error
0 is timeout */
fprintf(stderr, "SFTP upload timed out: %d\n",
rc);
break;
}
} while (1);
fprintf(stderr, "SFTP upload done!\n");
}
else {
fprintf(stderr, "SFTP failed to open destination path: %s\n",
dest);
}
libssh2_sftp_shutdown(sftp_session);
shutdown: shutdown:
libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing"); libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
libssh2_session_free(session); libssh2_session_free(session);
#ifdef WIN32 #ifdef WIN32
Sleep(1000); Sleep(1000);
closesocket(sock); closesocket(sock);
#else #else
sleep(1); sleep(1);
close(sock); close(sock);
#endif #endif
printf("all done\n"); printf("all done\n");
return 0; return 0;
} }