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#include <stdio.h>
const int LEGAL_PARENT_UID = 9001; /* mailman's UID */
const int LEGAL_PARENT_GID = 6; /* mailman's GID */
const char* SENDMAIL_CMD = "/usr/sbin/sendmail";
const char* ALIAS_FILE = "/etc/aliases";
const char* WRAPPER = "/home/mailman/mailman/mail/wrapper";
/*
** is the parent process allowed to call us?
*/
int LegalCaller()
{
/* compare to our parent's uid */
if(LEGAL_PARENT_UID != getuid())
{
printf("GOT UID %d.\n", getuid());
return 0;
}
if(LEGAL_PARENT_GID != getgid())
{
printf("GOT GID %d.\n", getgid());
return 0;
}
return 1;
}
void AddListAliases(char *list)
{
FILE *f;
int err = 0;
f = fopen(ALIAS_FILE ,"a+");
if (f == NULL)
{
err = 1;
f = stderr;
fprintf(f, "\n\n***********ERROR!!!!***********\n");
fprintf(f, "Could not write to the /etc/aliases file.\n");
fprintf(f, "Please become root, add the lines below to that file,\n");
fprintf(f, "And then run the command %s -bi\n", SENDMAIL_CMD);
}
fprintf(f, "\n\n#-- %s -- mailing list aliases:\n", list);
fprintf(f, "%s: \t|\"%s post %s\"\n", list, WRAPPER, list);
fprintf(f, "%s-admin: \t|\"%s mailowner %s\"\n", list, WRAPPER, list);
fprintf(f, "%s-request: \t|\"%s mailcmd %s\"\n", list, WRAPPER, list);
fprintf(f, "# I think we don't want this one... it'll change the unix from line...\n");
fprintf(f, "#owner-%s: \t%s-admin\n", list, list);
fprintf(f, "#%s-owner: \t%s-admin\n", list, list);
fprintf(f, "\n");
fclose(f);
if (!err)
{
printf("Rebuilding alias database...\n");
execlp(SENDMAIL_CMD, SENDMAIL_CMD, "-bi");
}
}
int main(int argc, char **argv, char **env)
{
char *command;
int i;
if(argc != 2)
{
printf("Usage: %s [list-name]\n", argv[0]);
exit(0);
}
if(LegalCaller())
{
setuid(geteuid());
AddListAliases(argv[1]);
}
else
{
printf("Illegal caller!\n");
return 1;
}
return 0;
}
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