/*
** rmail: front end for mail to stack up those stupid >From ... remote from ...
** lines and make a correct return address.  This works with the -f option
** to /usr/lib/sendmail so it won't work on systems without sendmail.
** However, it ought to be easy to modify a standard /bin/mail to do the
** same thing.
*/

# include <stdio.h>
# include <sysexits.h>
# include "useful.h"

SCCSID(@(#)rmail.c	3.7	(Berkeley)	03/07/82);

extern FILE *popen();
extern char *index();

bool	Debug;

# define MAILER	"/usr/lib/sendmail"

main(argc, argv)
	char **argv;
{
	FILE *out;	/* output to sendmail */
	char lbuf[512];	/* one line of the message */
	char from[512];	/* accumulated path of sender */
	char ufrom[64];	/* user on remote system */
	char sys[64];	/* a system in path */
	char junk[512];	/* scratchpad */
	char cmd[2000];
	register char *cp;
	register char *uf;	/* ptr into ufrom */
	int i;

# ifdef DEBUG
	if (argc > 1 && strcmp(argv[1], "-T") == 0)
	{
		Debug = TRUE;
		argc--;
		argv++;
	}
# endif DEBUG

	if (argc < 2)
	{
		fprintf(stderr, "Usage: rmail user ...\n");
		exit(EX_USAGE);
	}

	for (;;)
	{
		(void) fgets(lbuf, sizeof lbuf, stdin);
		if (strncmp(lbuf, "From ", 5) != 0 && strncmp(lbuf, ">From ", 6) != 0)
			break;
		(void) sscanf(lbuf, "%s %s", junk, ufrom);
		cp = lbuf;
		uf = ufrom;
		for (;;)
		{
			cp = index(cp+1, 'r');
			if (cp == NULL)
			{
				register char *p = rindex(uf, '!');

				if (p != NULL)
				{
					*p = '\0';
					strcpy(sys, uf);
					uf = p + 1;
					break;
				}
				cp = "remote from somewhere";
			}
#ifdef DEBUG
			if (Debug)
				printf("cp='%s'\n", cp);
#endif
			if (strncmp(cp, "remote from ", 12)==0)
				break;
		}
		if (cp != NULL)
			(void) sscanf(cp, "remote from %s", sys);
		strcat(from, sys);
		strcat(from, "!");
#ifdef DEBUG
		if (Debug)
			printf("ufrom='%s', sys='%s', from now '%s'\n", uf, sys, from);
#endif
	}
	strcat(from, ufrom);

	(void) sprintf(cmd, "%s -em -f%s", MAILER, from);
	while (*++argv != NULL)
	{
		strcat(cmd, " '");
		strcat(cmd, *argv);
		strcat(cmd, "'");
	}
#ifdef DEBUG
	if (Debug)
		printf("cmd='%s'\n", cmd);
#endif
	out = popen(cmd, "w");
	fputs(lbuf, out);
	while (fgets(lbuf, sizeof lbuf, stdin))
		fputs(lbuf, out);
	i = pclose(out);
	if ((i & 0377) != 0)
	{
		fprintf(stderr, "pclose: status 0%o\n", i);
		exit(EX_OSERR);
	}

	exit((i >> 8) & 0377);
}