From fd4a752e92bcf5ef34961cdf0a0bde25b7fccbf8 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Thu, 6 Apr 2023 13:28:10 +1000 Subject: nstool: Replace "pid" subcommand with "info" subcommand The new subcommand gives more information about the holder process and its namespace, and may be further extended in future. Add some options which give the old behaviour for existing scripts. Signed-off-by: David Gibson Signed-off-by: Stefano Brivio --- test/nstool.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 49 insertions(+), 11 deletions(-) (limited to 'test/nstool.c') diff --git a/test/nstool.c b/test/nstool.c index b736e8f..345b908 100644 --- a/test/nstool.c +++ b/test/nstool.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -30,9 +31,11 @@ static void usage(void) " Run within a set of namespaces, open a Unix domain socket\n" " (the \"control socket\") at SOCK and wait for requests from\n" " other nstool subcommands.\n" - " nstool pid SOCK\n" - " Print the pid of the nstool hold process with control socket\n" - " at SOCK, as seen in the caller's namespace.\n" + " nstool info [-pw] pid SOCK\n" + " Print information about the nstool hold process with control\n" + " socket at SOCK\n" + " -p Print just the holder's PID as seen by the caller\n" + " -w Retry connecting to SOCK until it is ready\n" " nstool stop SOCK\n" " Instruct the nstool hold with control socket at SOCK to\n" " terminate.\n"); @@ -103,17 +106,45 @@ static void cmd_hold(int argc, char *argv[]) unlink(sockpath); } -static void cmd_pid(int argc, char *argv[]) +static void cmd_info(int argc, char *argv[]) { - const char *sockpath = argv[1]; + const struct option options[] = { + {"pid", no_argument, NULL, 'p' }, + {"wait", no_argument, NULL, 'w' }, + { 0 }, + }; + bool pidonly = false, waitforsock = false; struct ucred peercred; socklen_t optlen = sizeof(peercred); - int fd, rc; + const char *optstring = "pw"; + const char *sockpath; + int fd, rc, opt; - if (argc != 2) + do { + opt = getopt_long(argc, argv, optstring, options, NULL); + + switch (opt) { + case 'p': + pidonly = true; + break; + case 'w': + waitforsock = true; + break; + case -1: + break; + default: + usage(); + } + } while (opt != -1); + + if (optind != argc - 1) { + fprintf(stderr, "B\n"); usage(); + } + + sockpath = argv[optind]; - fd = connect_ctl(sockpath, true); + fd = connect_ctl(sockpath, waitforsock); rc = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &peercred, &optlen); @@ -123,7 +154,14 @@ static void cmd_pid(int argc, char *argv[]) close(fd); - printf("%d\n", peercred.pid); + if (pidonly) { + printf("%d\n", peercred.pid); + } else { + printf("As seen from calling context:\n"); + printf("\tPID:\t%d\n", peercred.pid); + printf("\tUID:\t%u\n", peercred.uid); + printf("\tGID:\t%u\n", peercred.gid); + } } static void cmd_stop(int argc, char *argv[]) @@ -158,8 +196,8 @@ int main(int argc, char *argv[]) if (strcmp(subcmd, "hold") == 0) cmd_hold(argc - 1, argv + 1); - else if (strcmp(subcmd, "pid") == 0) - cmd_pid(argc - 1, argv + 1); + else if (strcmp(subcmd, "info") == 0) + cmd_info(argc - 1, argv + 1); else if (strcmp(subcmd, "stop") == 0) cmd_stop(argc - 1, argv + 1); else -- cgit v1.2.3