From 5bef9deeff8a2e4401de0f45c9701cd6f98f29d8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com> Date: Thu, 26 Nov 2015 21:03:35 +0100 Subject: [PATCH] Lookup dumpcap in PATH NixOS patch: Look for dumpcap in PATH first, because there may be a dumpcap wrapper that we want to use instead of the default non-setuid dumpcap binary. Also change execv() to execvp() because we've set argv[0] to "dumpcap" and have to enable PATH lookup. Wireshark is not a setuid program, so looking in PATH is not a security issue. Signed-off-by: Franz Pletz <fpletz@fnordicwalking.de> --- capchild/capture_sync.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/capchild/capture_sync.c b/capchild/capture_sync.c index 970688e..49914d5 100644 --- a/capchild/capture_sync.c +++ b/capchild/capture_sync.c @@ -332,7 +332,18 @@ init_pipe_args(int *argc) { #ifdef _WIN32 exename = g_strdup_printf("%s\\dumpcap.exe", progfile_dir); #else - exename = g_strdup_printf("%s/dumpcap", progfile_dir); + /* + * NixOS patch: Look for dumpcap in PATH first, because there may be a + * dumpcap wrapper that we want to use instead of the default + * non-setuid dumpcap binary. + */ + if (system("command -v dumpcap >/dev/null") == 0) { + /* Found working dumpcap */ + exename = g_strdup_printf("dumpcap"); + } else { + /* take Wireshark's absolute program path and replace "Wireshark" with "dumpcap" */ + exename = g_strdup_printf("%s/dumpcap", progfile_dir); + } #endif /* Make that the first argument in the argument list (argv[0]). */ @@ -729,7 +740,7 @@ sync_pipe_start(capture_options *capture_opts, capture_session *cap_session, voi */ dup2(sync_pipe[PIPE_WRITE], 2); ws_close(sync_pipe[PIPE_READ]); - execv(argv[0], argv); + execvp(argv[0], argv); g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s", argv[0], g_strerror(errno)); sync_pipe_errmsg_to_parent(2, errmsg, ""); @@ -997,7 +1008,7 @@ sync_pipe_open_command(char** argv, int *data_read_fd, dup2(sync_pipe[PIPE_WRITE], 2); ws_close(sync_pipe[PIPE_READ]); ws_close(sync_pipe[PIPE_WRITE]); - execv(argv[0], argv); + execvp(argv[0], argv); g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s", argv[0], g_strerror(errno)); sync_pipe_errmsg_to_parent(2, errmsg, ""); -- 2.6.3