diff options
| -rw-r--r-- | plugins/check_smtp.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c index 2000c620..2d2e2891 100644 --- a/plugins/check_smtp.c +++ b/plugins/check_smtp.c @@ -43,6 +43,8 @@ #define SMTP_PORT 25 #define SMTP_EXPECT "220" +#define SMTP_HELO "HELO " + /* sendmail will syslog a "NOQUEUE" error if session does not attempt * to do something useful. This can be prevented by giving a command * even if syntax is illegal (MAIL requires a FROM:<...> argument) @@ -74,10 +76,18 @@ main (int argc, char **argv) int sd; int result; char buffer[MAX_INPUT_BUFFER] = ""; + char helocmd[255] = SMTP_HELO ; + char myhostname[248]; + if (process_arguments (argc, argv) != OK) usage ("Invalid command arguments supplied\n"); + /* initalize the HELO command with the localhostname */ + gethostname(myhostname, sizeof(myhostname)); + strcat(helocmd, myhostname); + strcat(helocmd, "\r\n"); + /* initialize alarm signal handling */ signal (SIGALRM, socket_timeout_alarm_handler); @@ -138,12 +148,18 @@ main (int argc, char **argv) } /* close the connection */ + /* first send the HELO command */ + send(sd,helocmd,strlen(helocmd),0); + /* allow for response to helo command to reach us */ + recv(sd,buffer,MAX_INPUT_BUFFER-1,0); + #ifdef SMTP_USE_DUMMYCMD send(sd,SMTP_DUMMYCMD,strlen(SMTP_DUMMYCMD),0); /* allow for response to DUMMYCMD to reach us */ recv(sd,buffer,MAX_INPUT_BUFFER-1,0); #endif /* SMTP_USE_DUMMYCMD */ + /* finally close the connection */ send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0); close (sd); } |