Executing two commands with libssh2 - c

Question

I wrote this C code that uses the libssh2 library to connect to a ssh server and get the output of a command executed on the server.
Currently the code works fine, it's connecting to the ssh server and obtains the output of executed command from custom_command variable.
The problem is that I want to make it obtain the output of two commands, for example to obtain the output of custom_command and custom_command2 variables in the same libssh2 channel.
I tried with this but it doesen't work
while((rc = libssh2_channel_exec(channel, custom_command)) == LIBSSH2_ERROR_EAGAIN)
{
waitsocket(s_sock, session);
}
while((rc = libssh2_channel_exec(channel, custom_command2)) == LIBSSH2_ERROR_EAGAIN)
{
waitsocket(s_sock, session);
}
Does anyone know how I can modify this code to work as I said above?
//COMPILE COMMAND: gcc program.c -o program -lssh2
#include <unistd.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include "libssh2_config.h"
#include <libssh2.h>
static int waitsocket(int socket_fd, LIBSSH2_SESSION *session)
{
struct timeval timeout;
int rc, dir;
fd_set fd;
fd_set *writefd = NULL;
fd_set *readfd = NULL;
timeout.tv_sec = 3;
timeout.tv_usec = 0;
FD_ZERO(&fd);
FD_SET(socket_fd, &fd);
dir = libssh2_session_block_directions(session);
if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)
{
readfd = &fd;
}
if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)
{
writefd = &fd;
}
rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);
return rc;
}
int main()
{
//LOGIN CREDENTIALS
char *hostname = "127.0.0.1";
char *username = "vboxuser";
char *password = "changeme";
char *custom_command = "uptime";
char *custom_command2 = "hostname"
int port = 22;
int s_sock;
struct sockaddr_in addr;
struct timeval timeout;
timeout.tv_sec = 10;
timeout.tv_usec = 0;
LIBSSH2_SESSION *session;
LIBSSH2_CHANNEL *channel;
int rc, exitcode;
rc = libssh2_init(0);
if(rc != 0)
{
fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
return 1;
}
s_sock = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
addr.sin_addr.s_addr = inet_addr(hostname);
if(setsockopt(s_sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
{
perror("setsockopt failed\n");
}
if(setsockopt(s_sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
{
perror("setsockopt failed\n");
}
if(connect(s_sock, (struct sockaddr *)(&addr), sizeof(struct sockaddr_in)) != 0)
{
return -1;
}
session = libssh2_session_init();
if(!session)
{
return -1;
}
while((rc = libssh2_session_handshake(session, s_sock)) == LIBSSH2_ERROR_EAGAIN);
if(rc)
{
return -1;
}
while((rc = libssh2_userauth_password(session, username, password)) == LIBSSH2_ERROR_EAGAIN);
if(rc)
{
goto shutdown;
}
while((channel = libssh2_channel_open_session(session)) == NULL && libssh2_session_last_error(session, NULL, NULL, 0) == LIBSSH2_ERROR_EAGAIN )
{
waitsocket(s_sock, session);
}
if(channel == NULL)
{
goto shutdown;
}
while((rc = libssh2_channel_exec(channel, custom_command)) == LIBSSH2_ERROR_EAGAIN)
{
waitsocket(s_sock, session);
}
if(rc != 0)
{
goto shutdown;
}
for(;;)
{
int rc;
do
{
char command_output[65500];
rc = libssh2_channel_read(channel, command_output, sizeof(command_output));
if(rc > 0)
{
fprintf(stderr, "\nSuccessfully Login!\n \nuser:%s \npassword:%s \nhost:%s \nport:%d\n", username, password, hostname, port);
fprintf(stderr, "\nCommand output: %s\n", command_output);
goto shutdown;
}
else
{
if(rc != LIBSSH2_ERROR_EAGAIN)
{
goto shutdown;
}
}
}
while(rc > 0);
if(rc == LIBSSH2_ERROR_EAGAIN)
{
waitsocket(s_sock, session);
}
else
{
break;
}
}
while((rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN)
{
waitsocket(s_sock, session);
}
exitcode = 127;
if(rc == 0)
{
exitcode = libssh2_channel_get_exit_status(channel);
}
libssh2_channel_free(channel);
close(s_sock);
channel = NULL;
libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
libssh2_session_free(session);
libssh2_exit();
exit(0);
shutdown:
libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
libssh2_session_free(session);
close(s_sock);
libssh2_exit();
return 0;
}