PHP: Expect Usage Examples

Expect Usage Examples

Example #1 Expect Usage Example

This example connects to the remote host via SSH, and prints the remote uptime.

<?php
ini_set("expect.loguser", "Off");

$stream = fopen("expect://ssh root@remotehost uptime", "r");

$cases = array (
    array (0 => "password:", 1 => PASSWORD)
);

switch (expect_expectl ($stream, $cases)) {
    case PASSWORD:
        fwrite ($stream, "password\n");
        break;
 
    default:
        die ("Error was occurred while connecting to the remote host!\n");
}

while ($line = fgets($stream)) {
      print $line;
}
fclose ($stream);
?>

The following example connects to the remote host, determines whether installed OS is for 32 or 64 bit, then runs update for specific package.

Example #2 Another Expect Usage Example

<?php
ini_set("expect.timeout", -1);
ini_set("expect.loguser", "Off");

$stream = expect_popen("ssh root@remotehost");

while (true) {
    switch (expect_expectl ($stream, array (
            array ("password:", PASSWORD), / SSH is asking for password
            array ("yes/no)?", YESNO), / SSH is asking whether to store the host entry
            array ("~$ ", SHELL, EXP_EXACT), / We've got the shell!
    ))) {
        case PASSWORD:
            fwrite ($stream, "secret\n");
            break;

        case YESNO:
            fwrite ($stream, "yes\n");
            break;

        case SHELL:
            fwrite ($stream, "uname -a\n");
            while (true) {
                    switch (expect_expectl ($stream, array (
                            array ("~$ ", SHELL, EXP_EXACT), / We've got the shell!
                            array ("^Linux.*$", UNAME, EXP_REGEXP), / uname -a output
                    ), $match)) {
                        case UNAME:
                            $uname .= $match[0];
                            break;

                        case SHELL:
                            / Run update:
                            if (strstr ($uname, "x86_64")) {
                                    fwrite ($stream, "rpm -Uhv http://mirrorsite/somepath/some_64bit.rpm\n");
                            } else {
                                    fwrite ($stream, "rpm -Uhv http://mirrorsite/somepath/some_32bit.rpm\n");
                            }
                            fwrite ($stream, "exit\n");
                            break 2;

                        case EXP_TIMEOUT:
                        case EXP_EOF:
                            break 2;

                        default:
                            die ("Error has occurred!\n");
                    }
            }
            break 2;

        case EXP_TIMEOUT:
        case EXP_EOF:
            break 2;

        default:
            die ("Error has occurred!\n");
    }
}

fclose ($stream);
?>

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User Contributed Notes 1 note

down

David dkxl ¶

12 years ago

If using the examples with telnet instead of ssh, note that telnet may need \r (Carriage Return) instead of \n (New Line)

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