cc -I/path/to/include -I/path/to/sendmail -c myfile.cand your linking command line will look something like
cc -o myfilter [object-files] -L[library-location] -lmilter -pthread
Next, you must add the desired filters to your sendmail configuration
Mail filters have three equates:
S= equate specifies the socket where
sendmail should look for the filter; the optional
T= equates specify flags and timeouts, respectively.
All equates names, equate field names, and flag values are case sensitive.
The current flags (
|R||Reject connection if filter unavailable|
|T||Temporary fail connection if filter unavailable|
There are three fields inside of the
T= equate: S, R, and E.
Note the separator between each is a ";" (semicolon), as ","
(comma) already separates equates.
The value of each field is a decimal number followed by a single letter
designating the units ("s" for seconds, "m" for minutes).
The fields have the following meanings:
|C||Timeout for connecting to a filter. If set to 0, the
|S||Timeout for sending information from the MTA to a filter. Default: 10s|
|R||Timeout for reading reply from the filter. Default: 10s|
|E||Overall timeout between sending end-of-message to filter and waiting for the final acknowledgment. Default: 5m|
The following sendmail.mc example specifies three filters. The first two rendezvous on Unix-domain sockets in the /var/run directory; the third uses an IP socket on port 999.
INPUT_MAIL_FILTER(`filter1', `S=unix:/var/run/f1.sock, F=R') INPUT_MAIL_FILTER(`filter2', `S=unix:/var/run/f2.sock, F=T, T=S:1s;R:1s;E:5m') INPUT_MAIL_FILTER(`filter3', `S=inet:999@localhost, T=C:2m') define(`confINPUT_MAIL_FILTERS', `filter2,filter1,filter3')By default, the filters would be run in the order declared, i.e. "filter1, filter2, filter3"; however, since
m4 ../m4/cf.m4 myconfig.mc > myconfig.cf
confINPUT_MAIL_FILTERSis defined, the filters will be run "filter2, filter1, filter3". Also note that a filter can be defined without adding it to the input filter list by using MAIL_FILTER() instead of INPUT_MAIL_FILTER().
The above macros will result in the following lines being added to your .cf file:
Xfilter1, S=unix:/var/run/f1.sock, F=R Xfilter2, S=unix:/var/run/f2.sock, F=T, T=S:1s;R:1s;E:5m Xfilter3, S=inet:999@localhost, T=C:2m O InputMailFilters=filter2,filter1,filter3
Finally, the sendmail macros accessible via smfi_getsymval can be configured by defining the following m4 variables (or cf options):
|In .mc file||In .cf file||Default Value|