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libssh2
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libssh2/example/subsystem_netconf.c

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#include "libssh2_config.h"
#include <libssh2.h>
#ifdef WIN32
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#endif
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifndef INADDR_NONE
#define INADDR_NONE (in_addr_t)~0
#endif
#ifndef HAVE_SNPRINTF
# ifdef HAVE__SNPRINTF
# define snprintf _snprintf
# endif
#endif
const char *keyfile1 = "/home/username/.ssh/id_rsa.pub";
const char *keyfile2 = "/home/username/.ssh/id_rsa";
const char *username = "username";
const char *password = "";
const char *server_ip = "127.0.0.1";
enum {
AUTH_NONE = 0,
AUTH_PASSWORD,
AUTH_PUBLICKEY
};
static int netconf_write(LIBSSH2_CHANNEL *channel, const char *buf, size_t len)
{
int i;
ssize_t wr = 0;
do {
i = libssh2_channel_write(channel, buf, len);
if(i < 0) {
fprintf(stderr, "libssh2_channel_write: %d\n", i);
return -1;
}
wr += i;
} while(i > 0 && wr < (ssize_t)len);
return 0;
}
static int netconf_read_until(LIBSSH2_CHANNEL *channel, const char *endtag,
char *buf, size_t buflen)
{
ssize_t len;
size_t rd = 0;
char *endreply = NULL, *specialsequence = NULL;
memset(buf, 0, buflen);
do {
len = libssh2_channel_read(channel, buf + rd, buflen - rd);
if(LIBSSH2_ERROR_EAGAIN == len)
continue;
else if(len < 0) {
fprintf(stderr, "libssh2_channel_read: %d\n", (int)len);
return -1;
}
rd += len;
/* read more data until we see a rpc-reply closing tag followed by
* the special sequence ]]>]]> */
/* really, this MUST be replaced with proper XML parsing! */
endreply = strstr(buf, endtag);
if(endreply)
specialsequence = strstr(endreply, "]]>]]>");
} while(!specialsequence && rd < buflen);
if(!specialsequence) {
fprintf(stderr, "%s: ]]>]]> not found! read buffer too small?\n",
__func__);
return -1;
}
/* discard the special sequence so that only XML is returned */
rd = specialsequence - buf;
buf[rd] = 0;
return rd;
}
int main(int argc, char *argv[])
{
int rc, i, auth = AUTH_NONE;
struct sockaddr_in sin;
const char *fingerprint;
char *userauthlist;
LIBSSH2_SESSION *session;
LIBSSH2_CHANNEL *channel = NULL;
char buf[1048576]; /* avoid any buffer reallocation for simplicity */
ssize_t len;
#ifdef WIN32
SOCKET sock = INVALID_SOCKET;
WSADATA wsadata;
int err;
err = WSAStartup(MAKEWORD(2, 0), &wsadata);
if(err != 0) {
fprintf(stderr, "WSAStartup failed with error: %d\n", err);
return 1;
}
#else
int sock = -1;
#endif
if(argc > 1)
server_ip = argv[1];
if(argc > 2)
username = argv[2];
if(argc > 3)
password = argv[3];
rc = libssh2_init(0);
if(rc != 0) {
fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
return 1;
}
/* Connect to SSH server */
sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
#ifdef WIN32
if(sock == INVALID_SOCKET) {
fprintf(stderr, "failed to open socket!\n");
return -1;
}
#else
if(sock == -1) {
perror("socket");
return -1;
}
#endif
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(server_ip);
if(INADDR_NONE == sin.sin_addr.s_addr) {
fprintf(stderr, "inet_addr: Invalid IP address \"%s\"\n", server_ip);
return -1;
}
sin.sin_port = htons(830);
if(connect(sock, (struct sockaddr*)(&sin),
sizeof(struct sockaddr_in)) != 0) {
fprintf(stderr, "Failed to connect to %s!\n", inet_ntoa(sin.sin_addr));
return -1;
}
/* Create a session instance */
session = libssh2_session_init();
if(!session) {
fprintf(stderr, "Could not initialize SSH session!\n");
return -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, "Error when starting up 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");
/* check what authentication methods are available */
userauthlist = libssh2_userauth_list(session, username, strlen(username));
fprintf(stderr, "Authentication methods: %s\n", userauthlist);
if(strstr(userauthlist, "password"))
auth |= AUTH_PASSWORD;
if(strstr(userauthlist, "publickey"))
auth |= AUTH_PUBLICKEY;
/* check for options */
if(argc > 4) {
if((auth & AUTH_PASSWORD) && !strcasecmp(argv[4], "-p"))
auth = AUTH_PASSWORD;
if((auth & AUTH_PUBLICKEY) && !strcasecmp(argv[4], "-k"))
auth = AUTH_PUBLICKEY;
}
if(auth & AUTH_PASSWORD) {
if(libssh2_userauth_password(session, username, password)) {
fprintf(stderr, "Authentication by password failed.\n");
goto shutdown;
}
}
else if(auth & AUTH_PUBLICKEY) {
if(libssh2_userauth_publickey_fromfile(session, username, keyfile1,
keyfile2, password)) {
fprintf(stderr, "Authentication by public key failed!\n");
goto shutdown;
}
fprintf(stderr, "Authentication by public key succeeded.\n");
}
else {
fprintf(stderr, "No supported authentication methods found!\n");
goto shutdown;
}
/* open a channel */
channel = libssh2_channel_open_session(session);
if(!channel) {
fprintf(stderr, "Could not open the channel!\n"
"(Note that this can be a problem at the server!"
" Please review the server logs.)\n");
goto shutdown;
}
/* execute the subsystem on our channel */
if(libssh2_channel_subsystem(channel, "netconf")) {
fprintf(stderr, "Could not execute the \"netconf\" subsystem!\n"
"(Note that this can be a problem at the server!"
" Please review the server logs.)\n");
goto shutdown;
}
/* NETCONF: https://tools.ietf.org/html/draft-ietf-netconf-ssh-06 */
fprintf(stderr, "Sending NETCONF client <hello>\n");
snprintf(buf, sizeof(buf),
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<hello>"
"<capabilities>"
"<capability>urn:ietf:params:xml:ns:netconf:base:1.0</capability>"
"</capabilities>"
"</hello>\n"
"]]>]]>\n%n", (int *)&len);
if(-1 == netconf_write(channel, buf, len))
goto shutdown;
fprintf(stderr, "Reading NETCONF server <hello>\n");
len = netconf_read_until(channel, "</hello>", buf, sizeof(buf));
if(-1 == len)
goto shutdown;
fprintf(stderr, "Got %d bytes:\n----------------------\n%s",
(int)len, buf);
fprintf(stderr, "Sending NETCONF <rpc>\n");
snprintf(buf, sizeof(buf),
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
"<rpc xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">"
"<get-interface-information><terse/></get-interface-information>"
"</rpc>\n"
"]]>]]>\n%n", (int *)&len);
if(-1 == netconf_write(channel, buf, len))
goto shutdown;
fprintf(stderr, "Reading NETCONF <rpc-reply>\n");
len = netconf_read_until(channel, "</rpc-reply>", buf, sizeof(buf));
if(-1 == len)
goto shutdown;
fprintf(stderr, "Got %d bytes:\n----------------------\n%s",
(int)len, buf);
shutdown:
if(channel)
libssh2_channel_free(channel);
libssh2_session_disconnect(session, "Client disconnecting normally");
libssh2_session_free(session);
#ifdef WIN32
closesocket(sock);
#else
close(sock);
#endif
libssh2_exit();
return 0;
}
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