G. Pape
ipsvd

# ipsvd - examples

TCP/IP services
UDP/IP services
ipsvd instructions

### TCP/IP service examples

This `run` script provides an identd service on `0.0.0.0:113`

     #!/bin/sh
     exec tcpsvd -l0 0 113 identd

This `run` script provides a smtpfront-qmail service on `192.168.2.1:25`, with per-host instructions through the constant database `./peers.cdb`.

     #!/bin/sh
     exec 2>&1
     MAXSMTPD="`cat /var/qmail/control/concurrencyincoming`"
     exec softlimit -m2000000 \
       env SMTPGREETING=smarden.org \
           MAILRULES=/etc/mailfront/smtp/mailrules \
       tcpsvd -vp -uqmaild -c"$MAXSMTPD" -x./peers.cdb 192.168.2.1 25 \
         smtpfront-qmail

This `run` script provides a bincimaps service on `10.0.0.14:993`, with per-host concurrency limit, and with per-host instructions through the directory `./peers`.

     #!/bin/sh
     exec 2>&1
     exec tcpsvd -vvp -c40 -C10 -l0 -i./peers 10.0.0.14 993 \
       bincimap-up --logtype=multilog --conf=/etc/bincimap/bincimap.conf --ssl -- \
         /usr/bin/checkpw /usr/sbin/bincimapd

This `run` script provides a qmail-smtpd service on `192.168.14.6:25`, with per-host concurrency limit, and with per-host instructions through the directory `./peers`.

     #!/bin/sh
     exec 2>&1
     exec softlimit -m2000000 \
      tcpsvd -vvh -i./peers -uqmaild \
        -c40 -C'10:421 per host concurrency limit reached\r\n' \
          192.168.14.6 25 qmail-smtpd

### UDP/IP service examples

This `run` script provides a talkd service on `192.168.1.1:517`

     #!/bin/sh
     exec udpsvd -unobody:tty 192.168.1.1 517 in.talkd

This `run` script provides a tftpd service on `0.0.0.0:69` with per-IP-address instructions through the directory `/etc/tftpd/peers`

     #!/bin/sh
     cd /
     exec 2>&1
     exec udpsvd -v -lbootserver -unobody -i/etc/tftpd/peers 0 69 \
       in.tftpd -s /boot/tftpboot/

### ipsvd instruction examples

This `run` script provides a telnetd TCP/IP service, with per-IP-address instructions through the directory `./peers`

     #!/bin/sh
     exec tcpsvd -i./peers 0.0.0.0 23 in.telnetd

Per default any client IP address is allowed to connect to this service. To allow connections from `192.168.1.17`, and to deny connections from anywhere else, do

     # touch ./peers/192.168.1.17; chmod 644 ./peers/192.168.1.17
     # touch ./peers/0; chmod 0 ./peers/0

To allow connections from `192.168.3.0-255`, do

     # touch ./peers/192.168.3; chmod 644 ./peers/192.168.3

To deny connections from `10.0.*.*` explicitly, do

     # touch ./peers/10.0; chmod 0 ./peers/10.0

To have `TRUST=true` set in the environment when running in.telnetd for a connection from `192.168.14.2`, do

     # echo '+TRUST=true' >./peers/192.168.14.2; chmod 644 ./peers/192.168.14.2

To provide a sshd login for connections from `10.2.0.14` on port 23, and the usual telnetd service for all others, do

     # echo 'sshd -i' >./peers/10.2.0.14; chmod 744 ./peers/10.2.0.14

To allow only connections from IP addresses the (dynamic) hostnames `floyd.dyn.smarden.org` and `greg.dyn.smarden.org` currently resolve to, do

     # echo '=floyd.dyn.smarden.org' >./peers/0
     # echo '=greg.dyn.smarden.org' >>./peers/0
     # chmod 644 ./peers/0

See ipsvd instructions for details.