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/*
* env.c -- small service routines
*
* Copyright 1998 by Eric S. Raymond
* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <pwd.h>
#include <string.h>
#ifdef HAVE_NET_SOCKET_H
#include <net/socket.h>
#endif
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "fetchmail.h"
#include "getaddrinfo.h"
#include "i18n.h"
#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
#include <locale.h>
#endif
extern char *getenv(const char *); /* needed on sysV68 R3V7.1. */
void envquery(int argc, char **argv)
/* set up basic stuff from the environment (including the rc file name) */
{
struct passwd by_name, by_uid, *pwp;
if (!(user = getenv("FETCHMAILUSER")))
{
if (!(user = getenv("LOGNAME")))
{
user = getenv("USER");
}
}
if ((program_name = strrchr(argv[0], '/')) != NULL)
++program_name;
else
program_name = argv[0];
if (getenv("QMAILINJECT") && strcmp(getenv("QMAILINJECT"), ""))
{
fprintf(stderr,
GT_("%s: The QMAILINJECT environment variable is set.\n"
"This is dangerous as it can make qmail-inject or qmail's sendmail wrapper\n"
"tamper with your From: or Message-ID: headers.\n"
"Try \"env QMAILINJECT= %s YOUR ARGUMENTS HERE\"\n"
"%s: Abort.\n"),
program_name, program_name, program_name);
exit(PS_UNDEFINED);
}
if (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
{
fprintf(stderr,
GT_("%s: The NULLMAILER_FLAGS environment variable is set.\n"
"This is dangerous as it can make nullmailer-inject or nullmailer's\n"
"sendmail wrapper tamper with your From:, Message-ID: or Return-Path: headers.\n"
"Try \"env NULLMAILER_FLAGS= %s YOUR ARGUMENTS HERE\"\n"
"%s: Abort.\n"),
program_name, program_name, program_name);
exit(PS_UNDEFINED);
}
if (!(pwp = getpwuid(getuid())))
{
fprintf(stderr,
GT_("%s: You don't exist. Go away.\n"),
program_name);
exit(PS_UNDEFINED);
}
else
{
memcpy(&by_uid, pwp, sizeof(struct passwd));
if (!user || !(pwp = getpwnam(user)))
pwp = &by_uid;
else
{
/*
* This logic is needed to handle gracefully the possibility
* that multiple names might be mapped to one UID.
*/
memcpy(&by_name, pwp, sizeof(struct passwd));
if (by_name.pw_uid == by_uid.pw_uid)
pwp = &by_name;
else
pwp = &by_uid;
}
user = xstrdup(pwp->pw_name);
}
/* compute user's home directory */
home = getenv("HOME_ETC");
if (!home && !(home = getenv("HOME")))
home = pwp->pw_dir;
/* compute fetchmail's home directory */
if (!(fmhome = getenv("FETCHMAILHOME")))
fmhome = home;
#define RCFILE_NAME "fetchmailrc"
/*
* The (fmhome==home) leaves an extra character for a . at the
* beginning of the rc file's name, iff fetchmail is using $HOME
* for its files. We don't want to do that if fetchmail has its
* own home ($FETCHMAILHOME), however.
*/
rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+2);
/* avoid //.fetchmailrc */
if (strcmp(fmhome, "/") != 0)
strcpy(rcfile, fmhome);
else
*rcfile = '\0';
if (rcfile[strlen(rcfile) - 1] != '/')
strcat(rcfile, "/");
if (fmhome==home)
strcat(rcfile, ".");
strcat(rcfile, RCFILE_NAME);
}
char *host_fqdn(void)
/* get the FQDN of the machine we're running */
{
char tmpbuf[HOSTLEN+1];
char *result;
if (gethostname(tmpbuf, sizeof(tmpbuf)))
{
fprintf(stderr, GT_("%s: can't determine your host!"),
program_name);
exit(PS_DNS);
}
/* if we got a . in the hostname assume it is a FQDN */
if (strchr(tmpbuf, '.') == NULL)
{
/* if we got a basename (as we do in Linux) make a FQDN of it */
struct addrinfo hints, *res, *res0;
int e;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags=AI_CANONNAME;
e = getaddrinfo(tmpbuf, NULL, &hints, &res);
if (e) {
/* exit with error message */
fprintf(stderr,
GT_("gethostbyname failed for %s\n"), tmpbuf);
fprintf(stderr, "%s", gai_strerror(e));
exit(PS_DNS);
}
result = xstrdup(res->ai_canonname);
freeaddrinfo(res);
}
else
result = xstrdup(tmpbuf);
return result;
}
static char *tzoffset(time_t *now)
/* calculate timezone offset */
{
static char offset_string[6];
struct tm gmt, *lt;
int off;
char sign = '+';
gmt = *gmtime(now);
lt = localtime(now);
off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
if (lt->tm_year < gmt.tm_year)
off -= 24 * 60;
else if (lt->tm_year > gmt.tm_year)
off += 24 * 60;
else if (lt->tm_yday < gmt.tm_yday)
off -= 24 * 60;
else if (lt->tm_yday > gmt.tm_yday)
off += 24 * 60;
if (off < 0) {
sign = '-';
off = -off;
}
if (off >= 24 * 60) /* should be impossible */
off = 23 * 60 + 59; /* if not, insert silly value */
snprintf(offset_string, sizeof(offset_string),
"%c%02d%02d", sign, off / 60, off % 60);
return (offset_string);
}
char *rfc822timestamp(void)
/* return a timestamp in RFC822 form */
{
time_t now;
static char buf[50];
time(&now);
#ifdef HAVE_STRFTIME
/*
* Conform to RFC822. We generate a 4-digit year here, avoiding
* Y2K hassles. Max length of this timestamp in an English locale
* should be 29 chars. The only things that should vary by locale
* are the day and month abbreviations. The set_locale calls prevent
* weird multibyte i18n characters (such as kanji) from showing up
* in your Received headers.
*/
#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
setlocale (LC_TIME, "C");
#endif
strftime(buf, sizeof(buf)-1,
"%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS)
setlocale (LC_TIME, "");
#endif
strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
#else
/*
* This is really just a portability fallback, as the
* date format ctime(3) emits is not RFC822
* conformant.
*/
strlcpy(buf, ctime(&now), sizeof(buf));
buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
#endif /* HAVE_STRFTIME */
return(buf);
}
const char *showproto(int proto)
/* protocol index to protocol name mapping */
{
switch (proto)
{
case P_AUTO: return("auto");
#ifdef POP2_ENABLE
case P_POP2: return("POP2");
#endif /* POP2_ENABLE */
#ifdef POP3_ENABLE
case P_POP3: return("POP3");
case P_APOP: return("APOP");
case P_RPOP: return("RPOP");
#endif /* POP3_ENABLE */
#ifdef IMAP_ENABLE
case P_IMAP: return("IMAP");
#endif /* IMAP_ENABLE */
#ifdef ETRN_ENABLE
case P_ETRN: return("ETRN");
#endif /* ETRN_ENABLE */
#ifdef ODMR_ENABLE
case P_ODMR: return("ODMR");
#endif /* ODMR_ENABLE */
default: return("unknown?!?");
}
}
char *visbuf(const char *buf)
/* visibilize a given string */
{
static char *vbuf;
static size_t vbufs;
char *tp;
size_t needed;
needed = strlen(buf) * 5 + 1; /* worst case: HEX, plus NUL byte */
if (needed > vbufs) {
vbufs = needed;
vbuf = xrealloc(vbuf, vbufs);
}
tp = vbuf;
while (*buf)
{
if (*buf == '"') { *tp++ = '\\'; *tp++ = '"'; buf++; }
else if (*buf == '\\') { *tp++ = '\\'; *tp++ = '\\'; buf++; }
else if (isprint((unsigned char)*buf) || *buf == ' ') *tp++ = *buf++;
else if (*buf == '\a') { *tp++ = '\\'; *tp++ = 'a'; buf++; }
else if (*buf == '\b') { *tp++ = '\\'; *tp++ = 'b'; buf++; }
else if (*buf == '\f') { *tp++ = '\\'; *tp++ = 'f'; buf++; }
else if (*buf == '\n') { *tp++ = '\\'; *tp++ = 'n'; buf++; }
else if (*buf == '\r') { *tp++ = '\\'; *tp++ = 'r'; buf++; }
else if (*buf == '\t') { *tp++ = '\\'; *tp++ = 't'; buf++; }
else if (*buf == '\v') { *tp++ = '\\'; *tp++ = 'v'; buf++; }
else
{
const char hex[] = "0123456789abcdef";
*tp++ = '\\'; *tp++ = '0'; *tp++ = 'x';
*tp++ = hex[*buf >> 4];
*tp++ = hex[*buf & 0xf];
buf++;
}
}
*tp++ = '\0';
return(vbuf);
}
/* env.c ends here */
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