+/* *************************************************************************
+* NAME: chatchat.c
+*
+* DESCRIPTION:
+*
+* This program creates a pipe for the chat process to read. The user
+* can supply information (like a password) that will be picked up
+* by chat and sent just like the regular contents of a chat script.
+*
+* Usage is:
+*
+* chatchat <filename>
+*
+* where <filename> matches the option given in the chat script.
+*
+* for instance the chat script fragment:
+*
+* ...
+* name: \\dmyname \
+* word: @/var/tmp/p \
+* ...
+* ^
+* (note: leave some whitespace after the filename)
+*
+* expect "name:", reply with a delay followed by "myname"
+* expect "word:", reply with the data read from the pipe /var/tmp/p
+*
+* the matching usage of chatchat would be:
+*
+* chatchat /var/tmp/p
+*
+* eg:
+*
+* $chatchat /var/tmp/p
+* ...
+* some other process eventually starts:
+* chat ...
+* chat parses the "@/var/tmp/p" option and opens
+* /var/tmp/p
+* (chatchat prompts:)
+*
+* type PIN into SecurID card
+* enter resulting passcode: [user inputs something]
+*
+* chat reads /var/tmp/p & gets what the
+* user typed at chatchat's "enter string" prompt
+* chat removes the pipe file
+* chat sends the user's input as a response in
+* place of "@/var/tmp/p"
+*
+* PROCESS:
+*
+* gcc -g -o chatchat chatchat.c
+*
+*
+* GLOBALS: none
+*
+* REFERENCES:
+*
+* see the man pages and documentation that come with the 'chat' program
+* (part of the ppp package). you will need to use the modified chat
+* program that accepts the '@' operator.
+*
+* LIMITATIONS:
+*
+* REVISION HISTORY:
+*
+* STR Description Author
+*
+* 23-Mar-99 initial coding gpk
+* 12-May-99 unlink the pipe after closing paulus
+*
+* TARGET: ANSI C
+* This program is in the public domain.
+*
+*
+* ************************************************************************* */
+
+
+
+
+#include <sys/time.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+/* MAXINPUT - the data typed into chatchat must be fewer */
+/* characters than this. */
+
+#define MAXINPUT 80
+
+
+
+
+
+
+/* *************************************************************************
+
+
+ NAME: main
+
+
+ USAGE:
+
+ int argc;
+ char * argv[];
+
+ main(argc, argv[]);
+
+ returns: int
+
+ DESCRIPTION:
+ if the pipe file name is given on the command line,
+ create the pipe, prompt the user and put whatever
+ is typed into the pipe.
+
+ returns -1 on error
+ else # characters entered
+ REFERENCES:
+
+ LIMITATIONS:
+
+ GLOBAL VARIABLES:
+
+ accessed: none
+
+ modified: none
+
+ FUNCTIONS CALLED:
+
+ REVISION HISTORY:
+
+ STR Description of Revision Author
+
+ 25-Mar-99 initial coding gpk
+
+ ************************************************************************* */
+
+int main(int argc, char * argv[])
+{
+ int retval;
+
+ int create_and_write_pipe(char * pipename);
+
+ if (argc != 2)
+ {
+ fprintf(stderr, "usage: %s pipename\n", argv[0]);
+ retval = -1;
+ }
+ else
+ {
+ retval = create_and_write_pipe(argv[1]);
+ }
+ return (retval);
+}
+
+
+
+
+/* *************************************************************************
+
+
+ NAME: create_and_write_pipe
+
+
+ USAGE:
+
+ int some_int;
+ char * pipename;
+
+ some_int = create_and_write_pipe(pipename);
+
+ returns: int
+
+ DESCRIPTION:
+ given the pipename, create the pipe, open it,
+ prompt the user for a string to put into the
+ pipe, write the string, and close the pipe
+
+ on error, print out an error message and return -1
+
+ returns -1 on error
+ else #bytes written into the pipe
+ REFERENCES:
+
+ LIMITATIONS:
+
+ GLOBAL VARIABLES:
+
+ accessed: none
+
+ modified: none
+
+ FUNCTIONS CALLED:
+
+ REVISION HISTORY:
+
+ STR Description of Revision Author
+
+ 25-Mar-99 initial coding gpk
+ 12-May-99 remove pipe after closing paulus
+
+ ************************************************************************* */
+
+int create_and_write_pipe(char * pipename)
+{
+ int retval, created, pipefd, nread, nwritten;
+ char input[MAXINPUT];
+ char errstring[180];
+
+ int create_pipe(char * pipename);
+ int write_to_pipe(int pipefd, char * input, int nchar);
+
+ created = create_pipe(pipename);
+
+ if (-1 == created)
+ {
+ sprintf(errstring, "unable to create pipe '%s'", pipename);
+ perror(errstring);
+ retval = -1;
+ }
+ else
+ {
+
+ /* note: this open won't succeed until chat has the pipe */
+ /* open and ready to read. this makes for nice timing. */
+
+ pipefd = open(pipename, O_WRONLY);
+
+ if (-1 == pipefd)
+ {
+ sprintf(errstring, "unable to open pipe '%s'", pipename);
+ perror(errstring);
+ retval = -1;
+ }
+ else
+ {
+ fprintf(stderr, "%s \n %s",
+ "type PIN into SecurID card and",
+ "enter resulting passcode:");
+ nread = read(STDIN_FILENO, (void *)input, MAXINPUT);
+
+
+ if (0 >= nread)
+ {
+ perror("unable to read from stdin");
+ retval = -1;
+ }
+ else
+ {
+ /* munch off the newline character, chat supplies */
+ /* a return when it sends the string out. */
+ input[nread -1] = 0;
+ nread--;
+ nwritten = write_to_pipe(pipefd, input, nread);
+ /* printf("wrote [%d]: '%s'\n", nwritten, input); */
+ retval = nwritten;
+ }
+ close(pipefd);
+
+ /* Now make the pipe go away. It won't actually go away
+ completely until chat closes it. */
+ if (unlink(pipename) < 0)
+ perror("Warning: couldn't remove pipe");
+ }
+ }
+ return(retval);
+}
+
+
+
+
+
+
+
+/* *************************************************************************
+
+
+ NAME: create_pipe
+
+
+ USAGE:
+
+ int some_int;
+ char * pipename;
+
+ some_int = create_pipe(pipename);
+
+ returns: int
+
+ DESCRIPTION:
+ create a pipe of the given name
+
+ if there is an error (like the pipe already exists)
+ print an error message and return
+
+ return -1 on failure else success
+
+ REFERENCES:
+
+ LIMITATIONS:
+
+ GLOBAL VARIABLES:
+
+ accessed: none
+
+ modified: none
+
+ FUNCTIONS CALLED:
+
+ REVISION HISTORY:
+
+ STR Description of Revision Author
+
+ 25-Mar-99 initial coding gpk
+
+ ************************************************************************* */
+
+int create_pipe(char * pipename)
+{
+ mode_t old_umask;
+ int created;
+
+ /* hijack the umask temporarily to get the mode I want */
+ /* on the pipe. */
+
+ old_umask = umask(000);
+
+ created = mknod(pipename, S_IFIFO | S_IRWXU | S_IWGRP | S_IWOTH,
+ (dev_t)NULL);
+
+ /* now restore umask. */
+
+ (void)umask(old_umask);
+
+ if (-1 == created)
+ {
+ perror("unable to create pipe");
+ }
+
+ return(created);
+}
+
+
+
+
+
+
+/* *************************************************************************
+
+
+ NAME: write_to_pipe
+
+
+ USAGE:
+
+ int some_int;
+ int pipefd;
+ char * input;
+ int nchar;
+
+ some_int = write_to_pipe(pipefd, input, nchar);
+
+ returns: int
+
+ DESCRIPTION:
+ write nchars of data from input to pipefd
+
+ on error print a message to stderr
+
+ return -1 on error, else # bytes written
+ REFERENCES:
+
+ LIMITATIONS:
+
+ GLOBAL VARIABLES:
+
+ accessed: none
+
+ modified: none
+
+ FUNCTIONS CALLED:
+
+ REVISION HISTORY:
+
+ STR Description of Revision Author
+
+ 25-Mar-99 initial coding gpk
+ 12-May-99 don't write count word first paulus
+
+ ************************************************************************* */
+
+int write_to_pipe(int pipefd, char * input, int nchar)
+{
+ int nwritten;
+
+ /* nwritten = write(pipefd, (void *)&nchar, sizeof(nchar)); */
+ nwritten = write(pipefd, (void *)input, nchar);
+
+ if (-1 == nwritten)
+ {
+ perror("unable to write to pipe");
+ }
+
+ return(nwritten);
+}
projects / ppp.git / commitdiff