-
-/*
- * mts.c -- definitions for the mail transport system
- *
- * $Id$
- */
-
-#include "h/mh.h" /* for snprintf() */
-#include <h/nmh.h>
-
-#define nmhetcdir(file) NMHETCDIR#file
-
-#include <ctype.h>
-#include <stdio.h>
-#include <mts.h>
-#include <pwd.h>
-#include <netdb.h>
-
-#ifdef HAVE_SYS_UTSNAME_H
-# include <sys/utsname.h>
-#endif
-
-#define NOTOK (-1)
-#define OK 0
-
-extern int errno;
-
-/*
- * static prototypes
- */
-static char *tailor_value (char *);
-static void getuserinfo (void);
-
-/*
- * *mmdfldir and *uucpldir are the maildrop directories. If maildrops
- * are kept in the user's home directory, then these should be empty
- * strings. In this case, the appropriate ...lfil array should contain
- * the name of the file in the user's home directory. Usually, this is
- * something like ".mail".
- */
-
-/*
- * nmh mail transport interface customization file
- */
-static char *mtsconf = nmhetcdir(/mts.conf);
-
-static char *localname = "";
-static char *localdomain = "";
-static char *systemname = "";
-
-char *mmdfldir = MAILSPOOL;
-char *mmdflfil = "";
-char *uucpldir = "/usr/spool/mail";
-char *uucplfil = "";
-
-char *mmdlm1 = "\001\001\001\001\n";
-char *mmdlm2 = "\001\001\001\001\n";
-
-/* Cache the username and fullname of the user */
-static char username[BUFSIZ];
-static char fullname[BUFSIZ];
-
-/* Variables for username masquerading: */
- boolean draft_from_masquerading = FALSE; /* also used from post.c */
-static boolean mmailid_masquerading = FALSE;
- boolean username_extension_masquerading = FALSE; /* " from addrsbr.c */
-static char* masquerade = "";
-
-/*
- * MTS specific variables
- */
-#if defined(SMTPMTS)
-static char *sm_method = "smtp";
-int sm_mts = MTS_SMTP;
-char *hostable = nmhetcdir(/hosts);
-char *sendmail = SENDMAILPATH;
-#endif
-
-/*
- * SMTP/POP stuff
- */
-char *clientname = NULL;
-char *servers = "localhost \01localnet";
-char *pophost = "";
-
-/*
- * BBoards-specific variables
- */
-char *bb_domain = "";
-
-
-/*
- * POP BBoards-specific variables
- */
-#ifdef BPOP
-char *popbbhost = "";
-char *popbbuser = "";
-char *popbblist = nmhetcdir(/hosts.popbb);
-#endif /* BPOP */
-
-/*
- * Global MailDelivery file
- */
-char *maildelivery = nmhetcdir(/maildelivery);
-
-
-/*
- * Aliasing Facility (doesn't belong here)
- */
-int Everyone = NOTOK;
-static char *everyone = "-1";
-char *NoShell = "";
-
-/*
- * Customize the MTS settings for nmh by adjusting
- * the file mts.conf in the nmh etc directory.
- */
-
-struct bind {
- char *keyword;
- char **value;
-};
-
-static struct bind binds[] = {
- { "localname", &localname },
- { "localdomain", &localdomain },
- { "systemname", &systemname },
- { "mmdfldir", &mmdfldir },
- { "mmdflfil", &mmdflfil },
- { "uucpldir", &uucpldir },
- { "uucplfil", &uucplfil },
- { "mmdelim1", &mmdlm1 },
- { "mmdelim2", &mmdlm2 },
- { "masquerade", &masquerade },
-
-#if defined(SMTPMTS)
- { "mts", &sm_method },
- { "hostable", &hostable },
- { "sendmail", &sendmail },
-#endif
-
- { "clientname", &clientname },
- { "servers", &servers },
- { "pophost", &pophost },
- { "bbdomain", &bb_domain },
-
-#ifdef BPOP
- { "popbbhost", &popbbhost },
- { "popbbuser", &popbbuser },
- { "popbblist", &popbblist },
-#endif
-
-#ifdef NNTP
- { "nntphost", &popbbhost },
-#endif
-
- { "maildelivery", &maildelivery },
- { "everyone", &everyone },
- { "noshell", &NoShell },
- { NULL, NULL }
-};
-
-
-/*
- * Read the configuration file for the nmh interface
- * to the mail transport system (MTS).
- */
-
-void
-mts_init (char *name)
-{
- char *bp, *cp, buffer[BUFSIZ];
- struct bind *b;
- FILE *fp;
- static int inited = 0;
-
- if (inited++ || (fp = fopen (mtsconf, "r")) == NULL)
- return;
-
- while (fgets (buffer, sizeof(buffer), fp)) {
- if (!(cp = strchr(buffer, '\n')))
- break;
- *cp = 0;
- if (*buffer == '#' || *buffer == '\0')
- continue;
- if (!(bp = strchr(buffer, ':')))
- break;
- *bp++ = 0;
- while (isspace (*bp))
- *bp++ = 0;
-
- for (b = binds; b->keyword; b++)
- if (!strcmp (buffer, b->keyword))
- break;
- if (b->keyword && (cp = tailor_value (bp)))
- *b->value = cp;
- }
-
- fclose (fp);
-
- Everyone = atoi (everyone);
-
- if (strstr(masquerade, "draft_from") != NULL)
- draft_from_masquerading = TRUE;
-
- if (strstr(masquerade, "mmailid") != NULL)
- mmailid_masquerading = TRUE;
-
- if (strstr(masquerade, "username_extension") != NULL)
- username_extension_masquerading = TRUE;
-
-#ifdef SMTPMTS
- if (strcmp(sm_method, "smtp") == 0)
- sm_mts = MTS_SMTP;
- else if (strcmp(sm_method, "sendmail") == 0)
- sm_mts = MTS_SENDMAIL;
- else {
- advise(NULL, "unsupported \"mts\" value in mts.conf: %s", sm_method);
- sm_mts = MTS_SMTP;
- }
-#endif
-}
-
-
-#define QUOTE '\\'
-
-/*
- * Convert escaped values, malloc some new space,
- * and copy string to malloc'ed memory.
- */
-
-static char *
-tailor_value (char *s)
-{
- int i, r;
- char *bp;
- char buffer[BUFSIZ];
- size_t len;
-
- for (bp = buffer; *s; bp++, s++) {
- if (*s != QUOTE) {
- *bp = *s;
- } else {
- switch (*++s) {
- case 'b': *bp = '\b'; break;
- case 'f': *bp = '\f'; break;
- case 'n': *bp = '\n'; break;
- case 't': *bp = '\t'; break;
-
- case 0: s--;
- case QUOTE:
- *bp = QUOTE;
- break;
-
- default:
- if (!isdigit (*s)) {
- *bp++ = QUOTE;
- *bp = *s;
- }
- r = *s != '0' ? 10 : 8;
- for (i = 0; isdigit (*s); s++)
- i = i * r + *s - '0';
- s--;
- *bp = toascii (i);
- break;
- }
- }
- }
- *bp = 0;
-
- len = strlen (buffer) + 1;
- if ((bp = malloc (len)))
- memcpy (bp, buffer, len);
-
- return bp;
-}
-
-/*
- * Get the fully qualified name of the local host.
- */
-
-char *
-LocalName (void)
-{
- static char buffer[BUFSIZ] = "";
- struct hostent *hp;
-
-#ifdef HAVE_UNAME
- struct utsname name;
-#endif
-
- /* check if we have cached the local name */
- if (buffer[0])
- return buffer;
-
- mts_init ("mts");
-
- /* check if the mts.conf file specifies a "localname" */
- if (*localname) {
- strncpy (buffer, localname, sizeof(buffer));
- } else {
-#ifdef HAVE_UNAME
- /* first get our local name */
- uname (&name);
- strncpy (buffer, name.nodename, sizeof(buffer));
-#else
- /* first get our local name */
- gethostname (buffer, sizeof(buffer));
-#endif
-#ifdef HAVE_SETHOSTENT
- sethostent (1);
-#endif
- /* now fully qualify our name */
- if ((hp = gethostbyname (buffer)))
- strncpy (buffer, hp->h_name, sizeof(buffer));
- }
-
- /*
- * If the mts.conf file specifies a "localdomain",
- * we append that now. This should rarely be needed.
- */
- if (*localdomain) {
- strcat (buffer, ".");
- strcat (buffer, localdomain);
- }
-
- return buffer;
-}
-
-
-/*
- * This is only for UUCP mail. It gets the hostname
- * as part of the UUCP "domain".
- */
-
-char *
-SystemName (void)
-{
- static char buffer[BUFSIZ] = "";
-
-#ifdef HAVE_UNAME
- struct utsname name;
-#endif
-
- /* check if we have cached the system name */
- if (buffer[0])
- return buffer;
-
- mts_init ("mts");
-
- /* check if mts.conf file specifies a "systemname" */
- if (*systemname) {
- strncpy (buffer, systemname, sizeof(buffer));
- return buffer;
- }
-
-#ifdef HAVE_UNAME
- uname (&name);
- strncpy (buffer, name.nodename, sizeof(buffer));
-#else
- gethostname (buffer, sizeof(buffer));
-#endif
-
- return buffer;
-}
-
-
-/*
- * Get the username of current user
- */
-
-char *
-getusername (void)
-{
- if (username[0] == '\0')
- getuserinfo();
-
- return username;
-}
-
-
-/*
- * Get full name of current user (typically from GECOS
- * field of password file).
- */
-
-char *
-getfullname (void)
-{
- if (username[0] == '\0')
- getuserinfo();
-
- return fullname;
-}
-
-
-/*
- * Find the user's username and full name, and cache them.
- * Also, handle "mmailid" username masquerading controlled from the GECOS field
- * of the passwd file.
- */
-
-static void
-getuserinfo (void)
-{
- register char *cp, *np;
- register struct passwd *pw;
-
-#ifdef KPOP
- uid_t uid;
-
- uid = getuid ();
- if (uid == geteuid () && (cp = getenv ("USER")) != NULL
- && (pw = getpwnam (cp)) != NULL)
- strncpy (username, cp, sizeof(username));
- else if ((pw = getpwuid (uid)) == NULL
- || pw->pw_name == NULL
- || *pw->pw_name == '\0') {
-#else /* KPOP */
- if ((pw = getpwuid (getuid ())) == NULL
- || pw->pw_name == NULL
- || *pw->pw_name == '\0') {
-#endif /* KPOP */
- strncpy (username, "unknown", sizeof(username));
- snprintf (fullname, sizeof(fullname), "The Unknown User-ID (%d)",
- (int) getuid ());
- return;
- }
-
- np = pw->pw_gecos;
-
- /* Get the user's real name from the GECOS field. Stop once we hit a ',',
- which some OSes use to separate other 'finger' information in the GECOS
- field, like phone number. Also, if mmailid masquerading is turned on due
- to "mmailid" appearing on the "masquerade:" line of mts.conf, stop if we
- hit a '<' (which should precede any ','s). */
-#ifndef BSD42
- if (mmailid_masquerading)
- /* Stop at ',' or '<'. */
- for (cp = fullname; *np != '\0' && *np != ',' && *np != '<';
- *cp++ = *np++)
- continue;
- else
- /* Allow '<' as a legal character of the user's name. This code is
- basically a duplicate of the code above the "else" -- we don't
- collapse it down to one copy and put the mmailid_masquerading check
- inside the loop with "(x ? y : z)" because that's inefficient and the
- value'll never change while it's in there. */
- for (cp = fullname; *np != '\0' && *np != ',';
- *cp++ = *np++)
- continue;
-#else /* BSD42 */
- /* On BSD(-derived) systems, the system utilities that deal with the GECOS
- field (finger, mail, sendmail, etc.) translate any '&' character in it to
- the login name, with the first letter capitalized. So, for instance,
- fingering a user "bob" with the GECOS field "& Jones" would reveal him to
- be "In real life: Bob Jones". Surprisingly, though, the OS doesn't do
- the translation for you, so we have to do it manually here. */
- if (mmailid_masquerading)
- /* Stop at ',' or '<'. */
- for (cp = fullname;
- *np != '\0' && *np != ',' && *np != '<';) {
- if (*np == '&') { /* blech! */
- strcpy (cp, pw->pw_name);
- *cp = toupper(*cp);
- while (*cp)
- cp++;
- np++;
- } else {
- *cp++ = *np++;
- }
- }
- else
- /* Allow '<' as a legal character of the user's name. This code is
- basically a duplicate of the code above the "else" -- we don't
- collapse it down to one copy and put the mmailid_masquerading check
- inside the loop with "(x ? y : z)" because that's inefficient and the
- value'll never change while it's in there. */
- for (cp = fullname;
- *np != '\0' && *np != ',';) {
- if (*np == '&') { /* blech! */
- strcpy (cp, pw->pw_name);
- *cp = toupper(*cp);
- while (*cp)
- cp++;
- np++;
- } else {
- *cp++ = *np++;
- }
- }
-#endif /* BSD42 */
- *cp = '\0';
-
- if (mmailid_masquerading) {
- /* Do mmailid processing. The GECOS field should have the form
- "Full Name <fakeusername>". For instance,
- "Dan Harkless <Dan.Harkless>". Naturally, you'll want your MTA to
- have an alias (e.g. in /etc/aliases) from "fakeusername" to your
- account name. */
- if (*np)
- np++;
- for (cp = username; *np && *np != '>'; *cp++ = *np++)
- continue;
- *cp = '\0';
- }
- if (!mmailid_masquerading || *np == '\0')
- strncpy (username, pw->pw_name, sizeof(username));
-
- /* The $SIGNATURE environment variable overrides the GECOS field's idea of
- your real name. */
- if ((cp = getenv ("SIGNATURE")) && *cp)
- strncpy (fullname, cp, sizeof(fullname));
-
- if (strchr(fullname, '.')) { /* quote any .'s */
- char tmp[BUFSIZ];
-
- /* should quote "'s too */
- snprintf (tmp, sizeof(tmp), "\"%s\"", fullname);
- strncpy (fullname, tmp, sizeof(fullname));
- }
-
- return;
-}
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