main.c
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#include <grp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "imap.h"
#include "imap_commands.h"
#include "command.h"
static void init(void);
static int mainloop(void);
static void cleanup(void);
static void greeting(void);
static STATUS action(Command *command);
/* state the server is in */
STATES state = NON_AUTH;
FILE *input = NULL;
FILE *output = NULL;
/* output strings, maps STATUS to strings */
static char *status_word[3] = {"BAD", "NO", "OK"};
static char *status_code[3] = {"invalid", "failed", "completed"};
int main(int argc, char *argv[]) {
input = stdin;
output = stdout;
init();
greeting();
mainloop();
cleanup();
fclose(input);
fclose(output);
return 0;
}
static void init(void) {
struct group *gr;
gr = getgrnam("mail");
if( gr == NULL )
exit(-1);
if( setgid(gr->gr_gid) == -1 )
exit(-1);
openlog("GNU IMAP4", LOG_PID, LOG_MAIL);
if( output == stdout )
setvbuf(output, NULL, _IOLBF, 0);
}
static void cleanup(void) {
closelog();
}
static void greeting(void) {
fprintf(output, "* OK IMAP4rev1 Service Ready\r\n");
}
static int mainloop(void) {
char *client_string = NULL;
size_t len = 0;
Command *command;
STATUS status;
while( getline(&client_string, &len, input) != -1 ) {
command = parse_command(client_string);
status = action(command);
fprintf(output, "%s %s %s %s\r\n", command->tag, status_word[status],
command->cmd, status_code[status]);
free_command(command);
if( state == LOGOUT ) /* all done, let's go */
break;
}
free(client_string);
return 1;
}
STATUS action(Command *command) {
if( strcasecmp(command->cmd, "capability") == 0 ) {
return imap_capability(command);
}
else if( strcasecmp(command->cmd, "noop") == 0 ) {
return imap_noop(command);
}
else if( strcasecmp(command->cmd, "logout") == 0 ) {
return imap_logout(command);
}
else if( strcasecmp(command->cmd, "login") == 0 ) {
return imap_login(command);
}
return BAD;
}