/*
* 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 "fetchmail.h"
#include <stdio.h>
#include <ctype.h>
#if defined(STDC_HEADERS)
#endif
#include <pwd.h>
#include <string.h>
-#include <ctype.h>
+#ifdef HAVE_NET_SOCKET_H
+#include <net/socket.h>
+#endif
#ifdef HAVE_GETHOSTBYNAME
#include <netdb.h>
#endif /* HAVE_GETHOSTBYNAME */
+#include <sys/types.h>
+#include <time.h>
+#include "fetchmail.h"
+
+#include "i18n.h"
+#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
+#include <time.h>
+#include <locale.h>
+#endif
extern char *getenv(); /* needed on sysV68 R3V7.1. */
void envquery(int argc, char **argv)
/* set up basic stuff from the environment (including the rc file name) */
{
- char tmpbuf[BUFSIZ];
- struct passwd *pw;
+ 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 ((user = getenv("USER")) == (char *)NULL)
- user = getenv("LOGNAME");
+ 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 ((user == (char *)NULL) || (home = getenv("HOME")) == (char *)NULL)
+ if (!(pwp = getpwuid(getuid())))
+ {
+ fprintf(stderr,
+ GT_("%s: You don't exist. Go away.\n"),
+ program_name);
+ exit(PS_UNDEFINED);
+ }
+ else
{
- if ((pw = getpwuid(getuid())) != NULL)
+ memcpy(&by_uid, pwp, sizeof(struct passwd));
+ if (!user || !(pwp = getpwnam(user)))
+ pwp = &by_uid;
+ else
{
- user = pw->pw_name;
- home = pw->pw_dir;
+ /*
+ * 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;
}
- else
+ user = xstrdup(pwp->pw_name);
+ }
+
+ /* compute user's home directory */
+ if (!(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];
+
+ if (gethostname(tmpbuf, sizeof(tmpbuf)))
+ {
+ fprintf(stderr, GT_("%s: can't determine your host!"),
+ program_name);
+ exit(PS_DNS);
+ }
+#ifdef HAVE_GETHOSTBYNAME
+ /* if we got a . in the hostname assume it is a FQDN */
+ if (strchr(tmpbuf, '.') == NULL)
+ {
+ struct hostent *hp;
+
+ /* if we got a basename (as we do in Linux) make a FQDN of it */
+ hp = gethostbyname(tmpbuf);
+ if (hp == (struct hostent *) NULL)
{
+ /* exit with error message */
fprintf(stderr,
- "%s: can't find your name and home directory!\n",
- program_name);
- exit(PS_UNDEFINED);
+ GT_("gethostbyname failed for %s\n"), tmpbuf);
+ exit(PS_DNS);
}
+ return(xstrdup(hp->h_name));
}
+ else
+#endif /* HAVE_GETHOSTBYNAME */
+ return(xstrdup(tmpbuf));
+}
-#define RCFILE_NAME ".fetchmailrc"
- rcfile = (char *) xmalloc(strlen(home)+strlen(RCFILE_NAME)+2);
- /* avoid //.fetchmailrc */
- if (strcmp(home, "/") != 0) {
- strcpy(rcfile, home);
- } else {
- *rcfile = '\0';
+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;
}
- strcat(rcfile, "/");
- strcat(rcfile, RCFILE_NAME);
+ if (off >= 24 * 60) /* should be impossible */
+ off = 23 * 60 + 59; /* if not, insert silly value */
+ sprintf(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) && defined(HAVE_STRFTIME)
+ 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) && defined(HAVE_STRFTIME)
+ 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.
+ */
+ strcpy(buf, ctime(&now));
+ buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
+#endif /* HAVE_STRFTIME */
+
+ return(buf);
}
-char *showproto(int proto)
+const char *showproto(int proto)
/* protocol index to protocol name mapping */
{
switch (proto)
{
- case P_AUTO: return("auto"); break;
+ case P_AUTO: return("auto");
#ifdef POP2_ENABLE
- case P_POP2: return("POP2"); break;
+ case P_POP2: return("POP2");
#endif /* POP2_ENABLE */
- case P_POP3: return("POP3"); break;
- case P_IMAP: return("IMAP"); break;
- case P_IMAP_K4: return("IMAP-K4"); break;
-#ifdef GSSAPI
- case P_IMAP_GSS: return("IMAP-GSS"); break;
-#endif /* GSSAPI */
- case P_APOP: return("APOP"); break;
- case P_RPOP: return("RPOP"); break;
- case P_ETRN: return("ETRN"); break;
- default: return("unknown?!?"); break;
+#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?!?");
}
}
while (*buf)
{
- if (isprint(*buf) || *buf == ' ')
+ if (*buf == '"')
+ {
+ *tp++ = '\\'; *tp++ = '"';
+ buf++;
+ }
+ else if (*buf == '\\')
+ {
+ *tp++ = '\\'; *tp++ = '\\';
+ buf++;
+ }
+ else if (isprint(*buf) || *buf == ' ')
*tp++ = *buf++;
else if (*buf == '\n')
{