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authorGravatar Ron Yorston <rmy@tigress.co.uk>2012-04-28 17:04:19 +0200
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2012-04-28 17:04:19 +0200
commit576b1d3c417ddea79481063401837ec0bdb91658 (patch)
tree10ad0b85a5fa746442c3ad6e3607709f86d16aa6
parent0c62f20454b55a932d59c50b7418b8b634a8a23f (diff)
downloadbusybox-576b1d3c417ddea79481063401837ec0bdb91658.tar.gz
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sendmail: use host rather than NIS domain name for HELO
According to RFC 5321 the argument to HELO "contains the fully-qualified domain name of the SMTP client" or its IP address if no FQDN is available. BusyBox sendmail uses the NIS domain name instead which, in many cases, is likely to be the default "(none)". [vda: yes, I checked my machine and its uts.domainname was indeed "(none)"] Using the host name is more likely to satisfy the intent of the RFC while allowing the otherwise unused safe_getdomainname function to be removed. Signed-off-by: Ron Yorston <rmy@tigress.co.uk> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--include/libbb.h1
-rw-r--r--libbb/safe_gethostname.c22
-rw-r--r--mailutils/sendmail.c7
3 files changed, 4 insertions, 26 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 2cc146631..f12800f53 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -795,7 +795,6 @@ void qsort_string_vector(char **sv, unsigned count) FAST_FUNC;
int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout_ms) FAST_FUNC;
char *safe_gethostname(void) FAST_FUNC;
-char *safe_getdomainname(void) FAST_FUNC;
/* Convert each alpha char in str to lower-case */
char* str_tolower(char *str) FAST_FUNC;
diff --git a/libbb/safe_gethostname.c b/libbb/safe_gethostname.c
index bdb989631..cac99ae03 100644
--- a/libbb/safe_gethostname.c
+++ b/libbb/safe_gethostname.c
@@ -50,25 +50,3 @@ char* FAST_FUNC safe_gethostname(void)
uname(&uts);
return xstrndup(!uts.nodename[0] ? "?" : uts.nodename, sizeof(uts.nodename));
}
-
-/*
- * On success return the current malloced and NUL terminated domainname.
- * On error return malloced and NUL terminated string "?".
- * This is an illegal first character for a domainname.
- * The returned malloced string must be freed by the caller.
- */
-char* FAST_FUNC safe_getdomainname(void)
-{
-#if defined(__linux__)
-/* The field domainname of struct utsname is Linux specific. */
- struct utsname uts;
- uname(&uts);
- return xstrndup(!uts.domainname[0] ? "?" : uts.domainname, sizeof(uts.domainname));
-#else
- /* We really don't care about people with domain names wider than most screens */
- char buf[256];
- int r = getdomainname(buf, sizeof(buf));
- buf[sizeof(buf)-1] = '\0';
- return xstrdup(r < 0 ? "?" : buf);
-#endif
-}
diff --git a/mailutils/sendmail.c b/mailutils/sendmail.c
index aa381c60f..c426e9d85 100644
--- a/mailutils/sendmail.c
+++ b/mailutils/sendmail.c
@@ -118,7 +118,7 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
char *opt_from;
char *s;
llist_t *list = NULL;
- char *domain = sane_address(safe_getdomainname());
+ char *host = sane_address(safe_gethostname());
unsigned nheaders = 0;
int code;
@@ -222,8 +222,9 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
}
// we should start with modern EHLO
- if (250 != smtp_checkp("EHLO %s", domain, -1))
- smtp_checkp("HELO %s", domain, 250);
+ if (250 != smtp_checkp("EHLO %s", host, -1))
+ smtp_checkp("HELO %s", host, 250);
+ free(host);
// perform authentication
if (opts & OPT_a) {