Preserve vendclass optarg when parsing enterprise number

README.md

@@ -93,17 +93,23 @@ dhcpcd-9 defaults the run directory to `/var/run/dhcpcd` instead of
 
 To create a statically-linked .deb package for Drivenets (baseos, interfacehandler, containers):
 
-1. **Configure and build:**
+1. **Configure and build from the repository root:**
    ```bash
-   ./configure --libexecdir="/usr/lib/dhcpcd" --enable-static CFLAGS="-Os -g"
+   ./configure --libexecdir="/usr/lib/dhcpcd" --enable-static --without-udev CFLAGS="-Os -g"
    make
    ```
 
-2. **Install to package directory:**
+2. **Install to package directory from the repository root:**
    ```bash
-   make install DESTDIR=/path/to/dhcpcd_<VERSION>-dn_amd64
+   VERSION=10.0.6-dn_81498e4e
+   PKGDIR="$PWD/src/dhcpcd_${VERSION}-dn_amd64"
+   make install DESTDIR="$PKGDIR"
    ```
-   Replace `<VERSION>` with the actual version (e.g., `10.0.6`).
+   Replace `VERSION` with the actual package version. `DESTDIR` should be an
+   absolute path: the top-level install enters both `src/` and `hooks/`, and a
+   relative `DESTDIR` would be interpreted separately from each subdirectory.
+   Running `make install` from `src/` skips `hooks/` entirely and omits
+   `/usr/lib/dhcpcd/dhcpcd-run-hooks`.
 
 3. **Add Debian control files:**
 

src/if-options.c

@@ -1974,9 +1974,22 @@ parse_option(struct dhcpcd_ctx *ctx, const char *ifname, struct if_options *ifo,
 	case O_VENDCLASS:
 		ARG_REQUIRED;
 		fp = strwhite(arg);
-		if (fp)
-			*fp++ = '\0';
-		u = (uint32_t)strtou(arg, NULL, 0, 0, UINT32_MAX, &e);
+		bp = NULL;
+		/* Command line options are parsed globally and then replayed
+		 * per-interface using the same argv, so do not split optarg
+		 * in-place. Later passes still need the data after the EN. */
+		if (fp) {
+			dl = (size_t)(fp - arg);
+			bp = malloc(dl + 1);
+			if (!bp) {
+				logerr(__func__);
+				return -1;
+			}
+			memcpy(bp, arg, dl);
+			bp[dl] = '\0';
+		}
+		u = (uint32_t)strtou(bp ? bp : arg, NULL, 0, 0, UINT32_MAX, &e);
+		free(bp);
 		if (e) {
 			logerrx("invalid code: %s", arg);
 			return -1;