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135 lines
4.2 KiB
135 lines
4.2 KiB
pppd: Support arbitrary interface names
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This patch implements a new string option "ifname" which allows to specify
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fully custom PPP interface names on Linux. It does so by renaming the
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allocated pppX device immediately after it has been created to the requested
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interface name.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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--- a/pppd/main.c
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+++ b/pppd/main.c
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@@ -745,8 +745,11 @@ void
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set_ifunit(iskey)
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int iskey;
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{
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- info("Using interface %s%d", PPP_DRV_NAME, ifunit);
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- slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
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+ if (use_ifname[0] == 0)
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+ slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
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+ else
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+ slprintf(ifname, sizeof(ifname), "%s", use_ifname);
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+ info("Using interface %s", ifname);
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script_setenv("IFNAME", ifname, iskey);
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if (iskey) {
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create_pidfile(getpid()); /* write pid to file */
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--- a/pppd/options.c
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+++ b/pppd/options.c
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@@ -112,6 +112,7 @@ int log_to_fd = 1; /* send log messages
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bool log_default = 1; /* log_to_fd is default (stdout) */
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int maxfail = 10; /* max # of unsuccessful connection attempts */
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char linkname[MAXPATHLEN]; /* logical name for link */
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+char use_ifname[IFNAMSIZ]; /* physical name for PPP link */
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bool tune_kernel; /* may alter kernel settings */
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int connect_delay = 1000; /* wait this many ms after connect script */
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int req_unit = -1; /* requested interface unit */
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@@ -277,6 +278,9 @@ option_t general_options[] = {
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{ "linkname", o_string, linkname,
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"Set logical name for link",
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OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
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+ { "ifname", o_string, use_ifname,
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+ "Set physical name for PPP interface",
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+ OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, IFNAMSIZ },
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{ "maxfail", o_int, &maxfail,
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"Maximum number of unsuccessful connection attempts to allow",
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--- a/pppd/pppd.h
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+++ b/pppd/pppd.h
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@@ -74,6 +74,10 @@
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#include "eui64.h"
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#endif
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+#ifndef IFNAMSIZ
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+#define IFNAMSIZ 16
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+#endif
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+
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/*
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* Limits.
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*/
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@@ -317,6 +321,7 @@ extern char *record_file; /* File to rec
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extern bool sync_serial; /* Device is synchronous serial device */
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extern int maxfail; /* Max # of unsuccessful connection attempts */
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extern char linkname[MAXPATHLEN]; /* logical name for link */
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+extern char use_ifname[IFNAMSIZ]; /* physical name for PPP interface */
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extern bool tune_kernel; /* May alter kernel settings as necessary */
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extern int connect_delay; /* Time to delay after connect script */
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extern int max_data_rate; /* max bytes/sec through charshunt */
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--- a/pppd/sys-linux.c
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+++ b/pppd/sys-linux.c
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@@ -161,6 +161,10 @@ struct in6_ifreq {
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/* We can get an EIO error on an ioctl if the modem has hung up */
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#define ok_error(num) ((num)==EIO)
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+#if !defined(PPP_DRV_NAME)
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+#define PPP_DRV_NAME "ppp"
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+#endif /* !defined(PPP_DRV_NAME) */
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+
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static int tty_disc = N_TTY; /* The TTY discipline */
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static int ppp_disc = N_PPP; /* The PPP discpline */
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static int initfdflags = -1; /* Initial file descriptor flags for fd */
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@@ -620,7 +624,8 @@ void generic_disestablish_ppp(int dev_fd
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*/
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static int make_ppp_unit()
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{
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- int x, flags;
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+ struct ifreq ifr;
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+ int x, flags, s;
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if (ppp_dev_fd >= 0) {
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dbglog("in make_ppp_unit, already had /dev/ppp open?");
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@@ -643,6 +648,30 @@ static int make_ppp_unit()
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}
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if (x < 0)
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error("Couldn't create new ppp unit: %m");
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+
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+ if (use_ifname[0] != 0) {
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+ s = socket(PF_INET, SOCK_DGRAM, 0);
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+ if (s < 0)
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+ s = socket(PF_PACKET, SOCK_DGRAM, 0);
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+ if (s < 0)
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+ s = socket(PF_INET6, SOCK_DGRAM, 0);
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+ if (s < 0)
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+ s = socket(PF_UNIX, SOCK_DGRAM, 0);
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+ if (s >= 0) {
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+ slprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", PPP_DRV_NAME, ifunit);
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+ slprintf(ifr.ifr_newname, sizeof(ifr.ifr_newname), "%s", use_ifname);
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+ x = ioctl(s, SIOCSIFNAME, &ifr);
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+ close(s);
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+ } else {
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+ x = s;
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+ }
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+ if (x < 0) {
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+ error("Couldn't rename %s to %s", ifr.ifr_name, ifr.ifr_newname);
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+ close(ppp_dev_fd);
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+ ppp_dev_fd = -1;
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+ }
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+ }
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+
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return x;
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}
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--- a/pppstats/pppstats.c
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+++ b/pppstats/pppstats.c
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@@ -506,10 +506,12 @@ main(argc, argv)
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if (argc > 0)
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interface = argv[0];
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+#if 0
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if (sscanf(interface, PPP_DRV_NAME "%d", &unit) != 1) {
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fprintf(stderr, "%s: invalid interface '%s' specified\n",
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progname, interface);
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}
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+#endif
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#ifndef STREAMS
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{
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