/*
* env.c -- small service routines
*
+ * Copyright 1998 by Eric S. Raymond
* For license terms, see the file COPYING in this directory.
*/
#endif
#include <pwd.h>
#include <string.h>
-#include <ctype.h>
-#ifdef HAVE_GETHOSTBYNAME
+#ifdef HAVE_NET_SOCKET_H
+#include <net/socket.h>
+#endif
#include <netdb.h>
-#endif /* HAVE_GETHOSTBYNAME */
+#include <sys/types.h>
+#include <sys/socket.h>
#include "fetchmail.h"
+#include "getaddrinfo.h"
-extern char *getenv(); /* needed on sysV68 R3V7.1. */
+#include "i18n.h"
+#if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
+#include <locale.h>
+#endif
-extern char *program_name;
+#ifndef HAVE_DECL_GETENV
+extern char *getenv(const char *); /* needed on sysV68 R3V7.1. */
+#endif
void envquery(int argc, char **argv)
/* set up basic stuff from the environment (including the rc file name) */
{
- struct passwd *pw;
+ struct passwd by_name, by_uid, *pwp;
+
+ (void)argc;
+
+ (void)argc;
+ 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 (getenv("NULLMAILER_FLAGS") && strcmp(getenv("NULLMAILER_FLAGS"), ""))
{
- if ((pw = getpwuid(getuid())) != NULL)
- {
- user = pw->pw_name;
- home = pw->pw_dir;
- }
+ 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
{
- fprintf(stderr,
- "%s: can't find your name and home directory!\n",
- program_name);
- exit(PS_UNDEFINED);
+ /*
+ * 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);
}
-#define RCFILE_NAME ".fetchmailrc"
- rcfile = (char *) xmalloc(strlen(home)+strlen(RCFILE_NAME)+2);
+ endpwent();
+
+ /* compute user's home directory */
+ home = getenv("HOME_ETC");
+ if (!home && !(home = getenv("HOME")))
+ home = xstrdup(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(home, "/") != 0) {
- strcpy(rcfile, home);
- } else {
- *rcfile = '\0';
- }
- strcat(rcfile, "/");
+ 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 *host_fqdn(int required)
{
- char tmpbuf[HOSTLEN+1];
+ char tmpbuf[HOSTLEN+1];
+ char *result;
if (gethostname(tmpbuf, sizeof(tmpbuf)))
{
- fprintf(stderr, "%s: can't determine your host!",
+ 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 we got no . in the hostname, try to canonicalize it,
+ * else assume it is a FQDN */
if (strchr(tmpbuf, '.') == NULL)
{
- struct hostent *hp;
+ /* if we got a basename without dots, as we often do in Linux,
+ * look up canonical name (make a FQDN of it) */
+ struct addrinfo hints, *res;
+ int e;
- /* if we got a basename (as we do in Linux) make a FQDN of it */
- hp = gethostbyname(tmpbuf);
- if (hp == (struct hostent *) NULL)
- {
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_CANONNAME;
+
+ e = fm_getaddrinfo(tmpbuf, NULL, &hints, &res);
+ if (e) {
/* exit with error message */
fprintf(stderr,
- "gethostbyname failed for %s\n", tmpbuf);
- exit(PS_DNS);
+ GT_("gethostbyname failed for %s\n"), tmpbuf);
+ fprintf(stderr, "%s", gai_strerror(e));
+ fprintf(stderr, GT_("Cannot find my own host in hosts database to qualify it!\n"));
+ if (required)
+ exit(PS_DNS);
+ else {
+ fprintf(stderr, GT_("Trying to continue with unqualified hostname.\nDO NOT report broken Received: headers, HELO/EHLO lines or similar problems!\nDO repair your /etc/hosts, DNS, NIS or LDAP instead.\n"));
+ return xstrdup(tmpbuf);
+ }
}
- return(xstrdup(hp->h_name));
+
+ result = xstrdup(res->ai_canonname ? res->ai_canonname : tmpbuf);
+ fm_freeaddrinfo(res);
}
else
-#endif /* HAVE_GETHOSTBYNAME */
- return(xstrdup(tmpbuf));
+ 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 *showproto(int proto)
+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"); 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?!?");
}
}
char *visbuf(const char *buf)
/* visibilize a given string */
{
- static char vbuf[BUFSIZ];
- char *tp = vbuf;
+ static char *vbuf;
+ static size_t vbufs;
+ char *tp;
+ size_t needed;
+
+ needed = strlen(buf) * 5 + 1; /* worst case: HEX, plus NUL byte */
+
+ if (!vbuf || needed > vbufs) {
+ vbufs = needed;
+ vbuf = (char *)xrealloc(vbuf, vbufs);
+ }
+
+ tp = vbuf;
while (*buf)
{
- if (*buf == '"')
- {
- *tp++ = '\\'; *tp++ = '"';
- buf++;
- }
- else if (isprint(*buf) || *buf == ' ')
- *tp++ = *buf++;
- else if (*buf == '\n')
- {
- *tp++ = '\\'; *tp++ = 'n';
- buf++;
- }
- else if (*buf == '\r')
- {
- *tp++ = '\\'; *tp++ = 'r';
- buf++;
- }
- else if (*buf == '\b')
- {
- *tp++ = '\\'; *tp++ = 'b';
- buf++;
- }
- else if (*buf < ' ')
- {
- *tp++ = '\\'; *tp++ = '^'; *tp++ = '@' + *buf;
- 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
{
- (void) sprintf(tp, "\\0x%02x", *buf++);
- tp += strlen(tp);
+ const char hex[] = "0123456789abcdef";
+ *tp++ = '\\'; *tp++ = '0'; *tp++ = 'x';
+ *tp++ = hex[*buf >> 4];
+ *tp++ = hex[*buf & 0xf];
+ buf++;
}
}
- *tp++ = '\0';
+ *tp = '\0';
return(vbuf);
}
-
/* env.c ends here */
projects / ~andy / fetchmail / blobdiff