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文件: /usr/share/doc/ppp-2.4.5/scripts/chatchat/chatchat.c
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/* ************************************************************************* * 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); }
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