routes: allow a head clear with a context

This is because optionally defined routes may not have an interface
at the global level.
Also, init route lists earlier so they can be freed without error.

6 files changed, 27 insertions, 20 deletions

diff --git a/src/dhcpcd.c b/src/dhcpcd.c
index 23ca1870..291b9b5d 100644
--- a/src/dhcpcd.c
+++ b/src/dhcpcd.c
@@ -577,7 +577,7 @@ dhcpcd_selectprofile(struct interface *ifp, const char *profile)
 	} else
 		*ifp->profile = '\0';
 
-	free_options(ifp->options);
+	free_options(ifp->ctx, ifp->options);
 	ifp->options = ifo;
 	if (profile) {
 		add_options(ifp->ctx, ifp->name, ifp->options,
@@ -1165,7 +1165,7 @@ reload_config(struct dhcpcd_ctx *ctx)
 	if (ctx->options & DHCPCD_DAEMONISED)
 		ifo->options |= DHCPCD_DAEMONISED;
 	ctx->options = ifo->options;
-	free_options(ifo);
+	free_options(ctx, ifo);
 }
 
 static void
@@ -1523,6 +1523,8 @@ main(int argc, char **argv)
 #ifdef INET
 	ctx.udp_fd = -1;
 #endif
+	rt_init(&ctx);
+
 	logopts = LOGERR_ERR|LOGERR_LOG|LOGERR_LOG_DATE|LOGERR_LOG_PID;
 	i = 0;
 	while ((opt = getopt_long(argc, argv,
@@ -1617,7 +1619,7 @@ main(int argc, char **argv)
 	if (i == 2) {
 		printf("Interface options:\n");
 		if (optind == argc - 1) {
-			free_options(ifo);
+			free_options(&ctx, ifo);
 			ifo = read_config(&ctx, argv[optind], NULL, NULL);
 			if (ifo == NULL)
 				goto exit_failure;
@@ -1933,8 +1935,6 @@ printpidfile:
 		}
 	}
 
-	rt_init(&ctx);
-
 	TAILQ_FOREACH(ifp, ctx.ifaces, next) {
 		if (ifp->active)
 			dhcpcd_initstate1(ifp, argc, argv, 0);
@@ -1985,7 +1985,7 @@ printpidfile:
 			    handle_exit_timeout, &ctx);
 		}
 	}
-	free_options(ifo);
+	free_options(&ctx, ifo);
 	ifo = NULL;
 
 	if_sortinterfaces(&ctx);
@@ -2029,7 +2029,7 @@ exit1:
 		close(ctx.link_fd);
 	}
 	if_closesockets(&ctx);
-	free_options(ifo);
+	free_options(&ctx, ifo);
 	free_globals(&ctx);
 	ipv6_ctxfree(&ctx);
 	dev_stop(&ctx);
diff --git a/src/if-options.c b/src/if-options.c
index bd051b3b..d0feaddd 100644
--- a/src/if-options.c
+++ b/src/if-options.c
@@ -2354,7 +2354,7 @@ read_config(struct dhcpcd_ctx *ctx,
 		buf = malloc(buflen);
 		if (buf == NULL) {
 			logerr(__func__);
-			free_options(ifo);
+			free_options(ctx, ifo);
 			return NULL;
 		}
 		ldop = edop = NULL;
@@ -2368,7 +2368,7 @@ read_config(struct dhcpcd_ctx *ctx,
 				if (nbuf == NULL) {
 					logerr(__func__);
 					free(buf);
-					free_options(ifo);
+					free_options(ctx, ifo);
 					return NULL;
 				}
 				buf = nbuf;
@@ -2532,7 +2532,7 @@ read_config(struct dhcpcd_ctx *ctx,
 	free(buf);
 
 	if (profile && !have_profile) {
-		free_options(ifo);
+		free_options(ctx, ifo);
 		errno = ENOENT;
 		return NULL;
 	}
@@ -2577,7 +2577,7 @@ add_options(struct dhcpcd_ctx *ctx, const char *ifname,
 }
 
 void
-free_options(struct if_options *ifo)
+free_options(struct dhcpcd_ctx *ctx, struct if_options *ifo)
 {
 	size_t i;
 	struct dhcp_opt *opt;
@@ -2599,7 +2599,7 @@ free_options(struct if_options *ifo)
 				free(ifo->config[i++]);
 			free(ifo->config);
 		}
-		rt_headclear(&ifo->routes, AF_UNSPEC);
+		rt_headclear0(ctx, &ifo->routes, AF_UNSPEC);
 		free(ifo->script);
 		free(ifo->arping);
 		free(ifo->blacklist);
diff --git a/src/if-options.h b/src/if-options.h
index 4852d4b7..8dfe3486 100644
--- a/src/if-options.h
+++ b/src/if-options.h
@@ -230,6 +230,6 @@ struct if_options *read_config(struct dhcpcd_ctx *,
 int add_options(struct dhcpcd_ctx *, const char *,
     struct if_options *, int, char **);
 void free_dhcp_opt_embenc(struct dhcp_opt *);
-void free_options(struct if_options *);
+void free_options(struct dhcpcd_ctx *, struct if_options *);
 
 #endif
diff --git a/src/if.c b/src/if.c
index 208da245..eaebefa5 100644
--- a/src/if.c
+++ b/src/if.c
@@ -85,7 +85,7 @@ if_free(struct interface *ifp)
 	ipv6nd_free(ifp);
 	ipv6_free(ifp);
 	rt_freeif(ifp);
-	free_options(ifp->options);
+	free_options(ifp->ctx, ifp->options);
 	free(ifp);
 }
 
diff --git a/src/route.c b/src/route.c
index 4ce073fc..dc43a8c0 100644
--- a/src/route.c
+++ b/src/route.c
@@ -101,17 +101,13 @@ rt_desc(const char *cmd, const struct rt *rt)
 }
 
 void
-rt_headclear(struct rt_head *rts, int af)
+rt_headclear0(struct dhcpcd_ctx *ctx, struct rt_head *rts, int af)
 {
 	struct rt *rt, *rtn;
-	struct dhcpcd_ctx *ctx;
 
 	if (rts == NULL)
 		return;
-
-	if ((rt = TAILQ_FIRST(rts)) == NULL)
-		return;
-	ctx = rt->rt_ifp->ctx;
+	assert(ctx != NULL);
 	assert(&ctx->froutes != rts);
 
 	TAILQ_FOREACH_SAFE(rt, rts, rt_next, rtn) {
@@ -124,6 +120,16 @@ rt_headclear(struct rt_head *rts, int af)
 	}
 }
 
+void
+rt_headclear(struct rt_head *rts, int af)
+{
+	struct rt *rt;
+
+	if (rts == NULL || (rt = TAILQ_FIRST(rts)) == NULL)
+		return;
+	rt_headclear0(rt->rt_ifp->ctx, rts, af);
+}
+
 static void
 rt_headfree(struct rt_head *rts)
 {
diff --git a/src/route.h b/src/route.h
index db316e2e..204b20c0 100644
--- a/src/route.h
+++ b/src/route.h
@@ -86,6 +86,7 @@ void rt_dispose(struct dhcpcd_ctx *);
 struct rt * rt_find(struct rt_head *, const struct rt *);
 void rt_free(struct rt *);
 void rt_freeif(struct interface *);
+void rt_headclear0(struct dhcpcd_ctx *, struct rt_head *, int);
 void rt_headclear(struct rt_head *, int);
 void rt_headfreeif(struct rt_head *);
 struct rt * rt_new0(struct dhcpcd_ctx *);