/* pop3client.c -- An application which demonstrates how to use the GNU Mailutils pop3 functions. This application interactively allows users to contact a pop3 server. Copyright (C) 2003, 2004 Free Software Foundation GNU Mailutils is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Mailutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Mailutils; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <sys/types.h> #include <unistd.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <strings.h> #include <stdlib.h> #include <termios.h> #include <signal.h> #include <ctype.h> #ifdef WITH_READLINE # include <readline/readline.h> # include <readline/history.h> #endif #include <mailutils/pop3.h> #include <mailutils/iterator.h> #include <mailutils/error.h> #include <mailutils/errno.h> /* A structure which contains information on the commands this program can understand. */ typedef struct { const char *name; /* User printable name of the function. */ int (*func) (char *); /* Function to call to do the job. */ const char *doc; /* Documentation for this function. */ } COMMAND; /* The names of functions that actually do the manipulation. */ int com_apop (char *); int com_capa (char *); int com_disconnect (char *); int com_dele (char *); int com_exit (char *); int com_help (char *); int com_list (char *); int com_noop (char *); int com_connect (char *); int com_pass (char *); int com_quit (char *); int com_retr (char *); int com_rset (char *); int com_stat (char *); int com_top (char *); int com_uidl (char *); int com_user (char *); int com_verbose (char *); void initialize_readline (void); char *stripwhite (char *); COMMAND *find_command (char *); char *dupstr (const char *); int execute_line (char *); int valid_argument (const char *, char *); void sig_int (int); COMMAND commands[] = { {"apop", com_apop, "Authenticate with APOP: APOP user secret"}, {"capa", com_capa, "List capabilities: capa"}, {"disconnect", com_disconnect, "Close connection: disconnect"}, {"dele", com_dele, "Mark message: DELE msgno"}, {"exit", com_exit, "exit program"}, {"help", com_help, "Display this text"}, {"?", com_help, "Synonym for `help'"}, {"list", com_list, "List messages: LIST [msgno]"}, {"noop", com_noop, "Send no operation: NOOP"}, {"pass", com_pass, "Send passwd: PASS [passwd]"}, {"connect", com_connect, "Open connection: connect hostname [port]"}, {"quit", com_quit, "Go to Update state : QUIT"}, {"retr", com_retr, "Dowload message: RETR msgno"}, {"rset", com_rset, "Unmark all messages: RSET"}, {"stat", com_stat, "Get the size and count of mailbox : STAT [msgno]"}, {"top", com_top, "Get the header of message: TOP msgno [lines]"}, {"uidl", com_uidl, "Get the unique id of message: UIDL [msgno]"}, {"user", com_user, "send login: USER user"}, {"verbose", com_verbose, "Enable Protocol tracing: verbose [on|off]"}, {NULL, NULL, NULL} }; /* The name of this program, as taken from argv[0]. */ char *progname; /* Global handle for pop3. */ mu_pop3_t pop3; /* Flag if verbosity is needed. */ int verbose; /* When non-zero, this global means the user is done using this program. */ int done; char * dupstr (const char *s) { char *r; r = malloc (strlen (s) + 1); if (!r) { fprintf (stderr, "Memory exhausted\n"); exit (1); } strcpy (r, s); return r; } #ifdef WITH_READLINE /* Interface to Readline Completion */ char *command_generator (const char *, int); char **pop_completion (char *, int, int); /* Tell the GNU Readline library how to complete. We want to try to complete on command names if this is the first word in the line, or on filenames if not. */ void initialize_readline () { /* Allow conditional parsing of the ~/.inputrc file. */ rl_readline_name = (char *) "pop3"; /* Tell the completer that we want a crack first. */ rl_attempted_completion_function = (CPPFunction *) pop_completion; } /* Attempt to complete on the contents of TEXT. START and END bound the region of rl_line_buffer that contains the word to complete. TEXT is the word to complete. We can use the entire contents of rl_line_buffer in case we want to do some simple parsing. Return the array of matches, or NULL if there aren't any. */ char ** pop_completion (char *text, int start, int end) { char **matches; (void) end; matches = (char **) NULL; /* If this word is at the start of the line, then it is a command to complete. Otherwise it is the name of a file in the current directory. */ if (start == 0) matches = rl_completion_matches (text, command_generator); return (matches); } /* Generator function for command completion. STATE lets us know whether to start from scratch; without any state (i.e. STATE == 0), then we start at the top of the list. */ char * command_generator (const char *text, int state) { static int list_index, len; const char *name; /* If this is a new word to complete, initialize now. This includes saving the length of TEXT for efficiency, and initializing the index variable to 0. */ if (!state) { list_index = 0; len = strlen (text); } /* Return the next name which partially matches from the command list. */ while ((name = commands[list_index].name)) { list_index++; if (strncmp (name, text, len) == 0) return (dupstr (name)); } /* If no names matched, then return NULL. */ return ((char *) NULL); } #else void initialize_readline () { } char * readline (char *prompt) { char buf[255]; if (prompt) { printf ("%s", prompt); fflush (stdout); } if (!fgets (buf, sizeof (buf), stdin)) return NULL; return strdup (buf); } void add_history (const char *s ARG_UNUSED) { } #endif int main (int argc ARG_UNUSED, char **argv) { char *line, *s; progname = strrchr (argv[0], '/'); if (progname) progname++; else progname = argv[0]; initialize_readline (); /* Bind our completer. */ /* Loop reading and executing lines until the user quits. */ while (!done) { line = readline ((char *) "pop3> "); if (!line) break; /* Remove leading and trailing whitespace from the line. Then, if there is anything left, add it to the history list and execute it. */ s = stripwhite (line); if (*s) { int status; add_history (s); status = execute_line (s); if (status != 0) fprintf (stderr, "Error: %s\n", mu_strerror (status)); } free (line); } exit (0); } /* Parse and execute a command line. */ int execute_line (char *line) { register int i; COMMAND *command; char *word; /* Isolate the command word. */ i = 0; while (line[i] && isspace (line[i])) i++; word = line + i; while (line[i] && !isspace (line[i])) i++; if (line[i]) line[i++] = '\0'; command = find_command (word); if (!command) { fprintf (stderr, "%s: No such command for %s.\n", word, progname); return (-1); } /* Get argument to command, if any. */ while (isspace (line[i])) i++; word = line + i; /* Call the function. */ return ((*(command->func)) (word)); } /* Look up NAME as the name of a command, and return a pointer to that command. Return a NULL pointer if NAME isn't a command name. */ COMMAND * find_command (name) char *name; { register int i; for (i = 0; commands[i].name; i++) if (strcmp (name, commands[i].name) == 0) return (&commands[i]); return ((COMMAND *) NULL); } /* Strip whitespace from the start and end of STRING. Return a pointer into STRING. */ char * stripwhite (char *string) { register char *s, *t; for (s = string; isspace (*s); s++) ; if (*s == 0) return (s); t = s + strlen (s) - 1; while (t > s && isspace (*t)) t--; *++t = '\0'; return s; } int com_verbose (char *arg) { int status = 0; if (!valid_argument ("verbose", arg)) return EINVAL; verbose = (strcmp (arg, "on") == 0); if (pop3 != NULL) { if (verbose == 1) { mu_debug_t debug; mu_debug_create (&debug, NULL); mu_debug_set_level (debug, MU_DEBUG_PROT); status = mu_pop3_set_debug (pop3, debug); } else { status = mu_pop3_set_debug (pop3, NULL); } } return status; } int com_user (char *arg) { if (!valid_argument ("user", arg)) return EINVAL; return mu_pop3_user (pop3, arg); } int com_apop (char *arg) { char *user, *digest; if (!valid_argument ("apop", arg)) return EINVAL; user = strtok (arg, " "); digest = strtok (NULL, " "); if (!valid_argument ("apop", user) || !valid_argument ("apop", digest)) return EINVAL; return mu_pop3_apop (pop3, user, digest); } int com_capa (char *arg ARG_UNUSED) { iterator_t iterator = NULL; int status = mu_pop3_capa (pop3, &iterator); if (status == 0) { for (iterator_first (iterator); !iterator_is_done (iterator); iterator_next (iterator)) { char *capa = NULL; iterator_current (iterator, (void **) &capa); printf ("Capa: %s\n", (capa) ? capa : ""); } iterator_destroy (&iterator); } return status; } int com_uidl (char *arg) { int status = 0; if (arg == NULL || *arg == '\0') { iterator_t uidl_iterator = NULL; status = mu_pop3_uidl_all (pop3, &uidl_iterator); if (status == 0) { for (iterator_first (uidl_iterator); !iterator_is_done (uidl_iterator); iterator_next (uidl_iterator)) { char *uidl = NULL; iterator_current (uidl_iterator, (void **) &uidl); printf ("UIDL: %s\n", (uidl) ? uidl : ""); } iterator_destroy (&uidl_iterator); } } else { char *uidl = NULL; unsigned int msgno = strtoul (arg, NULL, 10); status = mu_pop3_uidl (pop3, msgno, &uidl); if (status == 0) printf ("Msg: %d UIDL: %s\n", msgno, (uidl) ? uidl : ""); free (uidl); } return status; } int com_list (char *arg) { int status = 0; if (arg == NULL || *arg == '\0') { iterator_t list_iterator; status = mu_pop3_list_all (pop3, &list_iterator); if (status == 0) { for (iterator_first (list_iterator); !iterator_is_done (list_iterator); iterator_next (list_iterator)) { char *list = NULL; iterator_current (list_iterator, (void **) &list); printf ("LIST: %s\n", (list) ? list : ""); } iterator_destroy (&list_iterator); } } else { size_t size = 0; unsigned int msgno = strtoul (arg, NULL, 10); status = mu_pop3_list (pop3, msgno, &size); if (status == 0) printf ("Msg: %d Size: %d\n", msgno, size); } return status; } int com_noop (char *arg ARG_UNUSED) { return mu_pop3_noop (pop3); } static void echo_off (struct termios *stored_settings) { struct termios new_settings; tcgetattr (0, stored_settings); new_settings = *stored_settings; new_settings.c_lflag &= (~ECHO); tcsetattr (0, TCSANOW, &new_settings); } static void echo_on (struct termios *stored_settings) { tcsetattr (0, TCSANOW, stored_settings); } int com_pass (char *arg) { char pass[256]; if (!arg || *arg == '\0') { struct termios stored_settings; printf ("passwd:"); fflush (stdout); echo_off (&stored_settings); fgets (pass, sizeof pass, stdin); echo_on (&stored_settings); putchar ('\n'); fflush (stdout); pass[strlen (pass) - 1] = '\0'; /* nuke the trailing line. */ arg = pass; } return mu_pop3_pass (pop3, arg); } int com_stat (char *arg ARG_UNUSED) { unsigned count, size; int status = 0; count = size = 0; status = mu_pop3_stat (pop3, &count, &size); fprintf (stdout, "Mesgs: %d Size %d\n", count, size); return status; } int com_dele (char *arg) { unsigned msgno; if (!valid_argument ("dele", arg)) return EINVAL; msgno = strtoul (arg, NULL, 10); return mu_pop3_dele (pop3, msgno); } /* Print out help for ARG, or for all of the commands if ARG is not present. */ int com_help (char *arg) { int i; int printed = 0; for (i = 0; commands[i].name; i++) { if (!*arg || (strcmp (arg, commands[i].name) == 0)) { printf ("%s\t\t%s.\n", commands[i].name, commands[i].doc); printed++; } } if (!printed) { printf ("No commands match `%s'. Possibilties are:\n", arg); for (i = 0; commands[i].name; i++) { /* Print in six columns. */ if (printed == 6) { printed = 0; printf ("\n"); } printf ("%s\t", commands[i].name); printed++; } if (printed) printf ("\n"); } return 0; } int com_rset (char *arg ARG_UNUSED) { return mu_pop3_rset (pop3); } int com_top (char *arg) { stream_t stream; unsigned int msgno; unsigned int lines; char *space; int status; if (!valid_argument ("top", arg)) return EINVAL; space = strchr (arg, ' '); if (space) { *space++ = '\0'; lines = strtoul (space, NULL, 10); } else lines = 0; msgno = strtoul (arg, NULL, 10); status = mu_pop3_top (pop3, msgno, lines, &stream); if (status == 0) { size_t n = 0; char buf[128]; while ((stream_readline (stream, buf, sizeof buf, 0, &n) == 0) && n) printf ("%s", buf); stream_destroy (&stream, NULL); } return status; } int com_retr (char *arg) { stream_t stream; unsigned int msgno; int status; if (!valid_argument ("retr", arg)) return EINVAL; msgno = strtoul (arg, NULL, 10); status = mu_pop3_retr (pop3, msgno, &stream); if (status == 0) { size_t n = 0; char buf[128]; while ((stream_readline (stream, buf, sizeof buf, 0, &n) == 0) && n) printf ("%s", buf); stream_destroy (&stream, NULL); } return status; } int com_connect (char *arg) { char host[256]; int port = 110; int status; if (!valid_argument ("connect", arg)) return 1; *host = '\0'; sscanf (arg, "%256s %d", host, &port); if (!valid_argument ("connect", host)) return EINVAL; if (pop3) com_disconnect (NULL); status = mu_pop3_create (&pop3); if (status == 0) { stream_t tcp; if (verbose) com_verbose ("on"); status = tcp_stream_create (&tcp, host, port, MU_STREAM_READ | MU_STREAM_NO_CHECK); if (status == 0) { mu_pop3_set_carrier (pop3, tcp); status = mu_pop3_connect (pop3); } else { mu_pop3_destroy (&pop3); pop3 = NULL; } } if (status != 0) fprintf (stderr, "Failed to create pop3: %s\n", mu_strerror (status)); return status; } int com_disconnect (char *arg ARG_UNUSED) { (void) arg; if (pop3) { mu_pop3_disconnect (pop3); mu_pop3_destroy (&pop3); pop3 = NULL; } return 0; } int com_quit (char *arg ARG_UNUSED) { int status = 0; if (pop3) { if (mu_pop3_quit (pop3) == 0) { status = com_disconnect (arg); } else { fprintf (stdout, "Try 'exit' to leave %s\n", progname); } } else fprintf (stdout, "Try 'exit' to leave %s\n", progname); return status; } int com_exit (char *arg ARG_UNUSED) { if (pop3) { mu_pop3_disconnect (pop3); mu_pop3_destroy (&pop3); } done = 1; return 0; } /* Return non-zero if ARG is a valid argument for CALLER, else print an error message and return zero. */ int valid_argument (const char *caller, char *arg) { if (!arg || !*arg) { fprintf (stderr, "%s: Argument required.\n", caller); return 0; } return 1; }