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/*
** NEWS2MAIL
** Read a news article on standard input, and send it to the mailing
** list as directed by the command-line arguments. It does some
** parsing and converting of news headers into mail headers.
**
** This program wants to lie to sendmail, so it should be setuid to
** one of the "trusted" users as listed in your sendmail.cf file.
**
*/
#include "gate.h"
#include <sys/stat.h>
#include <unistd.h>
#if defined(RCSID)
static char RCS[] =
"$Header: /nfs/papaya/u2/rsalz/src/newsgate/RCS/news2mail.c,v 1.14 91/07/18 21:14:26 rsalz Exp Locker: rsalz $";
#endif /* defined(RCSID) */
/* Flags for special header lines. */
typedef enum _HEADERTYPE {
HDR_NORM,
HDR_SUBJ,
HDR_CTRL,
HDR_REFS,
HDR_PATH,
HDR_FROM
} HEADERTYPE;
/* Header-cracking datatype. */
typedef struct _HEADER {
STRING Tag;
int Length;
HEADERTYPE Flag;
char Value[SM_SIZE];
} HEADER;
STATIC int Debugging;
char *Pname;
/* The headers we care about. */
STATIC HEADER Table[] = {
{ "Control", 7, HDR_CTRL },
{ "Date", 4, HDR_NORM },
{ "From", 4, HDR_FROM },
{ "Message-ID", 10, HDR_NORM },
{ "Organization", 12, HDR_NORM },
{ "MIME-Version", 12, HDR_NORM },
{ "Content-Type", 12, HDR_NORM },
{ "Content-Transfer-Encoding", 25, HDR_NORM },
{ "Path", 4, HDR_PATH },
{ "References", 10, HDR_REFS },
{ "Reply-To", 8, HDR_NORM },
{ "Subject", 7, HDR_SUBJ },
};
#if defined(USE_PATH_FOR_FROM)
/*
** Figure out the return address, by doing some optimization on the
** path. If we find an Internet host or a UUCP neighbor, remove all
** hosts before that one from the path.
*/
STATIC char *
EditPath(path, Host)
register char *path;
char *Host;
{
static char **Hinet;
static char **Huucp;
static char **Lsys;
static char buff[SM_SIZE];
register char *p;
register char *q;
register char **V;
register int ac;
register int i;
register int uucppal;
register int inetpal;
FILE *F;
FILE *P;
struct stat Sb1;
struct stat Sb2;
char **av;
char *Inetsite;
if ((ac = Split(path, &av, '!')) == 2) {
/* Simple case: "site!user" */
Strcpy(buff, av[1]);
SplitFree(&av);
return buff;
}
/* Initialize. This is silly for now, but eventually we might want
* to be able to handle a batched feed. */
#if defined(UUNAME)
if (Lsys == NULL) {
p = UUNAME;
/* If someone diddled L.sys, rebuild uuname output. */
if (stat(p, &Sb2) < 0
#if defined(L_SYS)
|| stat(L_SYS, &Sb1) < 0
#endif /* defined(L_SYS) */
|| Sb1.st_mtime >= Sb2.st_mtime)
if ((F = fopen(p, "w")) == NULL)
Fprintf(stderr, "%s: Can't create %s, %s.\n",
Pname, p, strerror(errno));
else {
if ((P = popen("exec uuname", "r")) == NULL)
Fprintf(stderr, "%s: popen failed, %s.\n",
Pname, strerror(errno));
else {
while (fgets(buff, sizeof buff, P))
Fputs(buff, F);
if (pclose(P))
Fprintf(stderr, "%s: pclose failed, %s.\n",
Pname, strerror(errno));
}
if (fclose(F) == EOF)
Fprintf(stderr, "%s: Error closing %s, %s.\n",
Pname, p, strerror(errno));
}
/* Slurp up names of UUCP hosts we talk to. */
Lsys = ReadFile(p);
#if defined(UUCP_INET)
/* Slurp up the UUCP->Internet name mappings. */
for (Huucp = ReadFile(UUCP_INET), i = 1; Huucp[i]; i++)
continue;
for (Hinet = NEW(char*, i), i = 0; (p = Huucp[i]) != NULL; i++) {
while (*p && !WHITE(*p))
p++;
if (*p)
for (*p++ = '\0'; *p && WHITE(*p); p++)
continue;
Hinet[i] = p;
}
#endif /* defined(UUCP_INET) */
}
#endif /* defined(UUNAME) */
/* Scan the path, noting if we find a UUCP or Internet neighbor. */
for (uucppal = 1, inetpal = 0, i = 0; i < ac; i++) {
if (Lsys)
for (V = Lsys; *V; V++)
if (EQ(av[i], *V))
uucppal = i;
if (Huucp)
for (V = Huucp; *V; V++)
if (EQ(av[i], *V)) {
inetpal = i;
Inetsite = Hinet[V - Huucp];
}
}
if (inetpal < uucppal) {
/* No Internet site found, turn a!b!c into a!b!c@this-host */
for (p = buff + APPEND(buff, av[uucppal]); ++uucppal < ac; ) {
*p++ = '!';
p += APPEND(p, av[uucppal]);
}
*p++ = '@';
Strcpy(p, Host);
}
else if (inetpal == ac - 1)
/* Turn a!b!inet!user into user@inet.domain.name */
Sprintf(buff, "%s@%s", av[ac], Inetsite);
else {
/* Turn a!inet!b!user into b!user@inet.domain.name */
for (p = buff + APPEND(buff, av[++inetpal]); ++inetpal < ac; ) {
*p++ = '!';
p += APPEND(p, av[inetpal]);
}
*p++ = '@';
Strcpy(p, Inetsite);
}
/* Convert all but the last "@" to "%" (fie on decwrl and psuecl!). */
if ((p = IDX(buff, '@')) != NULL)
for ( ; (q = IDX(p + 1, '@')) != NULL; p = q)
*p = '%';
SplitFree(&av);
return buff;
}
#endif /* defined(USE_PATH_FOR_FROM) */
/*
** Hack up the references, taking only the last three.
*/
STATIC char *
TrimReferences(refs)
char *refs;
{
static char buff[SM_SIZE];
register char *p;
register int i;
register int ac;
char **av;
if ((ac = Split(refs, &av, '\0')) != 0) {
/* Tricky. If there are five references, we want subscripts 2,3,4. */
i = ac < 3 ? 0 : ac - 3;
for (p = buff + APPEND(buff, av[i]); ++i < ac; ) {
*p++ = ',';
*p++ = ' ';
p += APPEND(p, av[i]);
}
SplitFree(&av);
}
else
buff[0] = '\0';
return buff;
}
#if !defined(HAVE_PUTENV)
/*
** A brute-forced implementation of putenv. Wastes memory. Consider
** it incentive to install the free BSD version...
*/
int
putenv(val)
char *val;
{
char **new;
int i;
int length;
int found;
char *p;
/* See if the value is already in the environment. */
found = -1;
if (p = IDX(val, '=')) {
for (length = ++p - val, i = 0; environ[i]; i++)
if (EQn(val, environ[i], length)) {
found = i;
break;
}
}
/* Get the size, and space for the new environment. */
for (i = 0; environ[i]; i++)
continue;
i += 2;
new = NEW(char*, i);
new[0] = val;
/* Copy the old to the new. */
for (i = 0; environ[i]; i++)
if (i != found)
new[i + 1] = environ[i];
new[i + 1] = NULL;
environ = new;
return 0;
}
#endif /* !defined(HAVE_PUTENV) */
/*
** Print a usage message and exit.
*/
STATIC void
Usage()
{
Fprintf(stderr, "Usage:\n\t%s %s %s\n",
Pname,
"[-.] [-e var=val]",
"listname listaddr listadmin host [article]");
exit(EX_USAGE);
}
int
main(ac, av)
int ac;
register char *av[];
{
register FILE *F;
register HEADER *hp;
register char *p;
STRING sv[10];
char buff[BUFSIZ];
char SenderAddr[SM_SIZE];
char ToAddr[SM_SIZE];
char Host[SM_SIZE];
#if defined(USE_PATH_FOR_FROM)
char Fullname[SM_SIZE];
#endif /* defined(USE_PATH_FOR_FROM) */
int i;
int HadEflag;
char *Listname;
char *Listaddr;
char *Listadmin;
char *Listhost;
char *Article;
/* Set defaults. */
if ((Pname = RDX(av[0], '/')) == NULL)
Pname = av[0];
else
Pname++;
HadEflag = FALSE;
/* Parse JCL. */
while ((i = getopt(ac, av, "E:.")) != EOF)
switch (i) {
default:
Usage();
/* NOTREACHED */
case '.':
Debugging = TRUE;
break;
case 'E':
if (putenv(COPY(optarg))) {
Fprintf(stderr, "%s: Can't add to environment, %s.\n",
Pname, strerror(errno));
exit(EX_TEMPFAIL);
}
HadEflag = TRUE;
break;
}
ac -= optind;
av += optind;
if (ac != 4 && ac != 5)
Usage();
/* Parse the positional parameters. */
Listname = av[0];
Listaddr = av[1];
Listadmin = av[2];
Listhost = av[3];
Article = av[4];
if (Article && freopen(Article, "r", stdin) == NULL) {
Fprintf(stderr, "%s: Can't open %s, %s.\n",
Pname, Article, strerror(errno));
exit(EX_NOINPUT);
}
/* Who are we? */
#if defined(WHOAMI)
Strcpy(Host, WHOAMI);
#else
if (gethostname(Host, sizeof Host) < 0) {
Fprintf(stderr, "%s: Can't get hostname, %s.\n",
Pname, strerror(errno));
exit(EX_TEMPFAIL);
}
#endif /* defined(WHOAMI) */
/* Read headers, storing the ones we want. */
while (fgets(buff, sizeof buff, stdin)) {
if ((p = IDX(buff, '\n')) != NULL)
*p = '\0';
else
Fprintf(stderr, "%s: Header line too long (%d bytes max)\n\t%s\n",
Pname, sizeof buff, buff);
if (p == buff)
/* Blank line means end of headers. */
break;
for (hp = Table; hp < ENDOF(Table); hp++)
if (buff[hp->Length] == ':' && CEQn(hp->Tag, buff, hp->Length)) {
/* Skip whitespace. */
for (p = &buff[hp->Length + 1]; *p && WHITE(*p); p++)
continue;
switch (hp->Flag) {
case HDR_SUBJ:
if (!EQn(p, "cmsg ", 5)) {
Strcpy(hp->Value, p);
break;
}
/* FALLTHROUGH */
case HDR_CTRL:
/* Eat rest of message. */
while (fgets(buff, sizeof buff, stdin))
continue;
exit(EX_OK);
/* NOTREACHED */
case HDR_NORM:
Strcpy(hp->Value, p);
break;
case HDR_FROM:
#if defined(USE_PATH_FOR_FROM)
/* Turn "joe@site.uucp (My Name)" into "(My Name)" */
if ((p = IDX(p, ' ')) && p[1] == '(')
Strcpy(Fullname, ++p);
else
Fullname[0] = '\0';
#else
Strcpy(hp->Value, p);
#endif /* defined(USE_PATH_FOR_FROM) */
break;
case HDR_REFS:
Strcpy(hp->Value, TrimReferences(p));
break;
#if defined(USE_PATH_FOR_FROM)
case HDR_PATH:
Strcpy(hp->Value, EditPath(p, Host));
break;
#endif /* defined(USE_PATH_FOR_FROM) */
}
}
}
/* Set up temp output. */
if ((F = tmpfile()) == NULL) {
Fprintf(stderr, "%s: Can't create temporary file, %s.\n",
Pname, strerror(errno));
exit(EX_CANTCREAT);
}
if (IDX(Listadmin, '@'))
Strcpy(SenderAddr, Listadmin);
else
Sprintf(SenderAddr, "%s@%s", Listadmin, Listhost);
if (IDX(Listaddr, '@'))
Strcpy(ToAddr, Listaddr);
else
Sprintf(ToAddr, "%s@%s", Listaddr, Listhost);
/* Print out a sanitized header for mail. */
if (IDX(Listname, '@'))
Strcpy(buff, Listname);
else
Sprintf(buff, "%s@%s", Listname, Listhost);
Fprintf(F, "Received: from GATEWAY by %s with netnews\n", Host);
Fprintf(F, "\tfor %s (%s)\n", ToAddr, buff);
Fprintf(F, "To: %s\n", buff);
for (hp = Table; hp < ENDOF(Table); hp++)
if (hp->Flag == HDR_PATH) {
#if defined(USE_PATH_FOR_FROM)
Fprintf(F, "From: %s %s\n", hp->Value, Fullname);
#endif /* defined(USE_PATH_FOR_FROM) */
Fprintf(F, "Sender: %s\n", SenderAddr);
}
else if (hp->Value[0])
Fprintf(F, "%s: %s\n", hp->Tag, hp->Value);
Fprintf(F, "\n");
/* Dump the body of the message. */
while (fgets(buff, sizeof buff, stdin))
Fputs(buff, F);
/* Set I/O correctly. Stderr is going to the log, stdin should be the
* message we created. Easiest thing is to unlink an open file. */
dup2(fileno(F), 0);
rewind(F);
fclose(F);
/* Common code for all argument vectors. */
i = 0;
#if defined(MAILSCRIPT)
/* Build the MAILSCRIPT argument vector. */
sv[i++] = MAILSCRIPT;
/* Headers are inline. */
sv[i++] = "-ASIS";
/* Set the logical sender/from address. */
sv[i++] = "-From";
sv[i++] = SenderAddr;
/* Set the recipient. */
sv[i++] = "-recip";
sv[i++] = ToAddr;
#endif /* defined(MAILSCRIPT) */
#if defined(SENDMAIL)
/* Build of the SENDMAIL argument vector. */
sv[i++] = SENDMAIL;
/* Ignore periods as message terminator (same as -oi). */
sv[i++] = "-i";
/* Queued delivery. */
sv[i++] = "-odq";
/* Set the "From:" address. */
sv[i++] = "-f";
sv[i++] = SenderAddr;
/* Set the recipient. */
sv[i++] = ToAddr;
#endif /* defined(SENDMAIL) */
#if defined(MMDF)
/* Build of the MMDF argument vector. */
sv[i++] = MMDF;
/* Deliver to mailbox (m), deliver all mail now (ln), trust me (t), send
* no warnings (z), return to "Sender:" (s), get recipients from the
* "To:" address (xto*). */
#if defined(MMDF_DELIVER_NOW)
sv[i++] = "-mlntzsxto*";
#else
sv[i++] = "-mtzsxto*";
#endif /* defined(MMDF_DELIVER_NOW) */
/* Set the From: address. */
sv[i++] = SenderAddr;
#endif /* defined(MMDF) */
/* Null-terminate the vector. */
sv[i] = NULL;
if (Debugging) {
for (i = 0; sv[i]; i++)
(void)printf(" |%s| ", sv[i]);
(void)printf("\n");
if (HadEflag) {
for (i = 0; sv[i]; i++)
(void)printf(" [%s] ", sv[i]);
(void)printf("\n");
}
while (fgets(buff, sizeof buff, stdin))
Fputs(buff, stdout);
exit(EX_OK);
}
/* Try to setuid, if desired. Could "factor out" the execv from the
* #if, but I hate the way the resultant "dangling else" looks. */
#if defined(TRUSTED)
if (setuid(TRUSTED) < 0)
Fprintf(stderr, "%s: Can't setuid to %d, %s.\n",
Pname, TRUSTED, strerror(errno));
else
(void)execv(sv[0], (char *const *)sv);
#else
(void)execv(sv[0], (char *const *)sv);
#endif /* defined(TRUSTED) */
/* Something failed; dump the message and quit */
Fprintf(stderr, "%s: Can't execv %s, %s.\n",
Pname, sv[0], strerror(errno));
while (fgets(buff, sizeof buff, stdin))
Fputs(buff, stdout);
exit(EX_OSERR);
return EX_OSERR;
}
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