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-rw-r--r--utils/pb-event.c100
1 files changed, 76 insertions, 24 deletions
diff --git a/utils/pb-event.c b/utils/pb-event.c
index 1a3cd3b..3649c9f 100644
--- a/utils/pb-event.c
+++ b/utils/pb-event.c
@@ -49,35 +49,91 @@ static void print_usage(void)
{
print_version();
printf(
-"Usage: pb-event [-h, --help] [-V, --version]\n"
+"Usage: pb-event [-h] [event...]\n"
"\n"
-" Reads a single petitboot user event on stdin and forwards it to the\n"
-" petitboot discover server pb-discover. User events must have the\n"
-" following format:\n"
+" Send a single petitboot user event to the petitboot discover server.\n"
+" Events can be read from stdin, or provided on the command line.\n"
+" User events must have the following format:\n"
"\n"
-" (add|remove)@device-id\\0[name=value\\0][image=value\\0][args=value\\0]\n"
+" (add|remove)@device-id [name=value] [image=value] [args=value]\n"
+"\n"
+" When read from stdin, components are separated by NUL chars\n"
"\n"
"Examples:\n"
"\n"
-" printf 'add@/net/eth0\\0name=netboot\\0image=tftp://192.168.1.10/vmlinux\\0args=root=/dev/nfs nfsroot=192.168.1.10:/target\\0' | pb-event\n"
+" args:\n"
+" pb-event add@/net/eth0 name=netboot image=tftp://192.168.1.10/vmlinux\n"
+" pb-event remove@/net/eth0\n"
+"\n"
+" stdin:\n"
+" printf 'add@/net/eth0\\0name=netboot\\0image=tftp://10.0.0.2/vmlinux\\0' \\\n"
+" | pb-event\n"
" printf 'remove@/net/eth0\\0' | pb-event\n"
"\n");
}
-int main(int argc, __attribute__((unused)) char *argv[])
+static const char *err_max_size = "pb-event: message too large "
+ "(%zu byte max)\n";
+
+static ssize_t parse_event_args(int n, char * const * args,
+ char *buf, size_t max_len)
+{
+ ssize_t arg_len, total_len;
+ const char *arg;
+ int i;
+
+ total_len = 0;
+
+ for (i = 0; i < n; i++) {
+ arg = args[i];
+ arg_len = strlen(arg);
+
+ if (total_len + (size_t)i + 1 > max_len) {
+ fprintf(stderr, err_max_size, max_len);
+ return -1;
+ }
+
+ memcpy(buf + total_len, arg, arg_len);
+ total_len += arg_len;
+
+ buf[total_len] = '\0';
+ total_len++;
+ }
+
+ return total_len;
+
+}
+
+static ssize_t parse_event_file(FILE *filp, char *buf, size_t max_len)
+{
+ int len;
+
+ len = fread(buf, 1, max_len, filp);
+
+ if (!feof(filp)) {
+ fprintf(stderr, err_max_size, max_len);
+ return -1;
+ }
+
+ if (!len)
+ return -1;
+
+ return len;
+}
+
+int main(int argc, char *argv[])
{
- int result;
struct sockaddr_un addr;
char buf[PBOOT_USER_EVENT_SIZE];
ssize_t len;
int s;
int i;
-
- if (argc > 1) {
+
+ if (argc >= 2 && !strcmp(argv[1], "-h")) {
print_usage();
- return EXIT_FAILURE;
+ return EXIT_SUCCESS;
}
-
+
s = socket(PF_UNIX, SOCK_DGRAM, 0);
if (s < 0) {
@@ -85,19 +141,15 @@ int main(int argc, __attribute__((unused)) char *argv[])
return EXIT_FAILURE;
}
- result = EXIT_SUCCESS;
-
- len = fread(buf, 1, sizeof(buf), stdin);
-
- if (!feof(stdin)) {
- fprintf(stderr, "pb-event: msg too big (%u byte max)\n",
- (unsigned int)sizeof(buf));
- result = EXIT_FAILURE;
- /* continue on and try to write msg */
+ if (argc > 1) {
+ len = parse_event_args(argc - 1, argv + 1,
+ buf, sizeof(buf));
+ } else {
+ len = parse_event_file(stdin, buf, sizeof(buf));
}
- if (!len)
- return result;
+ if (len < 0)
+ return EXIT_FAILURE;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
@@ -120,5 +172,5 @@ int main(int argc, __attribute__((unused)) char *argv[])
}
DBG("pb-event: wrote %u bytes\n", (unsigned int)len);
- return result;
+ return EXIT_SUCCESS;
}
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