From a6168e1f1bdb639c0ffd15a5f4eed864814e0bce Mon Sep 17 00:00:00 2001 From: Jan Safranek Date: Fri, 26 Nov 2010 14:30:45 +0300 Subject: [PATCH 2/7] Customize 'permission denied' error. Add Fedora-specific message to error output when dumpcap cannot be started because of permissions. Signed-off-by: Jan Safranek --- capture_sync.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/capture_sync.c b/capture_sync.c index 391aa6a..6dfe1de 100644 --- a/capture_sync.c +++ b/capture_sync.c @@ -368,6 +368,7 @@ sync_pipe_start(capture_options *capture_opts, capture_session *cap_session) gchar *signal_pipe_name; #else char errmsg[1024+1]; + const char *securitymsg = ""; int sync_pipe[2]; /* pipe used to send messages from child to parent */ enum PIPES { PIPE_READ, PIPE_WRITE }; /* Constants 0 and 1 for PIPE_READ and PIPE_WRITE */ #endif @@ -638,8 +639,11 @@ sync_pipe_start(capture_options *capture_opts, capture_session *cap_session) dup2(sync_pipe[PIPE_WRITE], 2); ws_close(sync_pipe[PIPE_READ]); execv(argv[0], argv); - g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s", - argv[0], g_strerror(errno)); + if (errno == EPERM || errno == EACCES) + securitymsg = "\nAre you a member of the 'wireshark' group? Try running\n'usermod -a -G wireshark _your_username_' as root."; + g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s%s", + argv[0], g_strerror(errno), securitymsg); + sync_pipe_errmsg_to_parent(2, errmsg, ""); /* Exit with "_exit()", so that we don't close the connection @@ -731,6 +735,7 @@ sync_pipe_open_command(char** argv, int *data_read_fd, PROCESS_INFORMATION pi; #else char errmsg[1024+1]; + const char *securitymsg = ""; int sync_pipe[2]; /* pipe used to send messages from child to parent */ int data_pipe[2]; /* pipe used to send data from child to parent */ #endif @@ -865,8 +870,11 @@ sync_pipe_open_command(char** argv, int *data_read_fd, ws_close(sync_pipe[PIPE_READ]); ws_close(sync_pipe[PIPE_WRITE]); execv(argv[0], argv); - g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s", - argv[0], g_strerror(errno)); + execv(argv[0], (gpointer)argv); + if (errno == EPERM || errno == EACCES) + securitymsg = "\nAre you a member of the 'wireshark' group? Try running\n'usermod -a -G wireshark _your_username_' as root."; + g_snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s%s", + argv[0], g_strerror(errno), securitymsg); sync_pipe_errmsg_to_parent(2, errmsg, ""); /* Exit with "_exit()", so that we don't close the connection -- 1.8.3.1