Fix FTBFS when using -pedantic compiler flag.

I am attaching an incremental git-am ready patch to go on top your Git HEAD,
to fix all sorts of issues and make this conforming C99 with default
options set,
and fix another load of warnings you receive when setting the compiler
to pick the nits,
-pedantic-errors -std=c99 (or c11, c18, c2x).
It changes many void * to uint8_t * to make the "increment by bytes"
explicit.
You can't do:

void *foo;
// ...
foo += 2.

src/arp.c

@@ -35,7 +35,7 @@ struct arp_record {
 static struct arp_record *arps = NULL, *old = NULL, *freelist = NULL;
 static time_t last = 0;
 
-static int filter_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv)
+static int filter_mac(int family, void *addrp, char *mac, size_t maclen, void *parmv)
 {
   struct arp_record *arp;
 

src/blockdata.c

@@ -193,7 +193,7 @@ void *blockdata_retrieve(struct blockdata *block, size_t len, void *data)
 {
   size_t blen;
   struct  blockdata *b;
-  void *new, *d;
+  uint8_t *new, *d;
   
   static unsigned int buff_len = 0;
   static unsigned char *buff = NULL;

src/dnsmasq.h

@@ -339,7 +339,7 @@ union all_addr {
   struct datablock {
     unsigned short rrtype;
     unsigned char datalen; /* also length of SOA in negative records. */
-    char data[];
+    char data[1];
   } rrdata;
 };
 
@@ -1667,7 +1667,7 @@ void route_sock(void);
 
 /* bpf.c or netlink.c */
 typedef union {
-	int (*af_unspec)(int family, char *addrp, char *mac, size_t maclen, void *parmv);
+	int (*af_unspec)(int family, void *addrp, char *mac, size_t maclen, void *parmv);
 	int (*af_inet)(struct in_addr local, int if_index, char *label, struct in_addr netmask, struct in_addr broadcast, void *vparam);
 	int (*af_inet6)(struct in6_addr *local, int prefix, int scope, int if_index, int flags, unsigned int preferred, unsigned int valid, void *vparam);
 	int (*af_local)(int index, unsigned int type, char *mac, size_t maclen, void *parm);

src/edns0.c

@@ -491,7 +491,7 @@ static size_t add_umbrella_opt(struct dns_header *header, size_t plen, unsigned
 {
   *cacheable = 0;
 
-  struct umbrella_opt opt = {{"ODNS"}, UMBRELLA_VERSION, 0, {}};
+  struct umbrella_opt opt = {{"ODNS"}, UMBRELLA_VERSION, 0, {0}};
   u8 *u = &opt.fields[0];
   int family = source->sa.sa_family;
   int size = family == AF_INET ? INADDRSZ : IN6ADDRSZ;

src/forward.c

@@ -3054,7 +3054,7 @@ static struct frec *lookup_frec(char *target, int class, int rrtype, int id, int
 }
 
 /* Send query packet again, if we can. */
-void resend_query()
+void resend_query(void)
 {
   if (daemon->srv_save)
     server_send(daemon->srv_save, daemon->fd_save,

src/loop.c

@@ -19,7 +19,7 @@
 #ifdef HAVE_LOOP
 static ssize_t loop_make_probe(u32 uid);
 
-void loop_send_probes()
+void loop_send_probes(void)
 {
    struct server *serv;
    struct randfd_list *rfds = NULL;

src/network.c

@@ -647,7 +647,7 @@ static int iface_allowed_v4(struct in_addr local, int if_index, char *label,
 /*
  * Clean old interfaces no longer found.
  */
-static void clean_interfaces()
+static void clean_interfaces(void)
 {
   struct irec *iface;
   struct irec **up = &daemon->interfaces;

src/outpacket.c

@@ -23,7 +23,7 @@ static size_t outpacket_counter;
 
 void end_opt6(int container)
 {
-   void *p = daemon->outpacket.iov_base + container + 2;
+   uint8_t *p = (uint8_t *)daemon->outpacket.iov_base + container + 2;
    u16 len = outpacket_counter - container - 4 ;
    
    PUTSHORT(len, p);
@@ -50,11 +50,11 @@ int save_counter(int newval)
 
 void *expand(size_t headroom)
 {
-  void *ret;
+  uint8_t *ret;
 
   if (expand_buf(&daemon->outpacket, outpacket_counter + headroom))
     {
-      ret = daemon->outpacket.iov_base + outpacket_counter;
+      ret = (uint8_t *)daemon->outpacket.iov_base + outpacket_counter;
       outpacket_counter += headroom;
       return ret;
     }
@@ -65,7 +65,7 @@ void *expand(size_t headroom)
 int new_opt6(int opt)
 {
   int ret = outpacket_counter;
-  void *p;
+  unsigned char *p;
 
   if ((p = expand(4)))
     {
@@ -88,7 +88,7 @@ void *put_opt6(void *data, size_t len)
   
 void put_opt6_long(unsigned int val)
 {
-  void *p;
+  unsigned char *p;
   
   if ((p = expand(4)))  
     PUTLONG(val, p);
@@ -96,7 +96,7 @@ void put_opt6_long(unsigned int val)
 
 void put_opt6_short(unsigned int val)
 {
-  void *p;
+  uint8_t *p;
 
   if ((p = expand(2)))
     PUTSHORT(val, p);   

src/rfc3315.c

@@ -39,8 +39,8 @@ static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbu
 static void log6_opts(int nest, unsigned int xid, void *start_opts, void *end_opts);
 static void log6_packet(struct state *state, char *type, struct in6_addr *addr, char *string);
 static void log6_quiet(struct state *state, char *type, struct in6_addr *addr, char *string);
-static void *opt6_find (void *opts, void *end, unsigned int search, unsigned int minsize);
-static void *opt6_next(void *opts, void *end);
+static void *opt6_find (uint8_t *opts, uint8_t *end, unsigned int search, unsigned int minsize);
+static void *opt6_next(uint8_t *opts, uint8_t *end);
 static unsigned int opt6_uint(unsigned char *opt, int offset, int size);
 static void get_context_tag(struct state *state, struct dhcp_context *context);
 static int check_ia(struct state *state, void *opt, void **endp, void **ia_option);
@@ -61,11 +61,11 @@ static void calculate_times(struct dhcp_context *context, unsigned int *min_time
 
 #define opt6_len(opt) ((int)(opt6_uint(opt, -2, 2)))
 #define opt6_type(opt) (opt6_uint(opt, -4, 2))
-#define opt6_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[4+(i)]))
+#define opt6_ptr(opt, i) ((void *)&(((uint8_t *)(opt))[4+(i)]))
 
-#define opt6_user_vendor_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2+(i)]))
+#define opt6_user_vendor_ptr(opt, i) ((void *)&(((uint8_t *)(opt))[2+(i)]))
 #define opt6_user_vendor_len(opt) ((int)(opt6_uint(opt, -4, 2)))
-#define opt6_user_vendor_next(opt, end) (opt6_next(((void *) opt) - 2, end))
+#define opt6_user_vendor_next(opt, end) (opt6_next(((uint8_t *) opt) - 2, end))
  
 
 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,
@@ -107,11 +107,11 @@ unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *if
 static int dhcp6_maybe_relay(struct state *state, unsigned char *inbuff, size_t sz, 
 			     struct in6_addr *client_addr, int is_unicast, time_t now)
 {
-  void *end = inbuff + sz;
-  void *opts = inbuff + 34;
+  uint8_t *end = inbuff + sz;
+  uint8_t *opts = inbuff + 34;
   int msg_type = *inbuff;
   unsigned char *outmsgtypep;
-  void *opt;
+  uint8_t *opt;
   struct dhcp_vendor *vendor;
 
   /* if not an encapsulated relayed message, just do the stuff */
@@ -232,7 +232,7 @@ static int dhcp6_maybe_relay(struct state *state, unsigned char *inbuff, size_t
   
   for (opt = opts; opt; opt = opt6_next(opt, end))
     {
-      if (opt6_ptr(opt, 0) + opt6_len(opt) > end) 
+      if ((uint8_t *)opt6_ptr(opt, 0) + opt6_len(opt) > end)
         return 0;
      
       /* Don't copy MAC address into reply. */
@@ -1307,7 +1307,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbu
      reallocated. */
   ((unsigned char *)(daemon->outpacket.iov_base))[start_msg] = outmsgtype;
 
-  log6_opts(0, state->xid, daemon->outpacket.iov_base + start_opts, daemon->outpacket.iov_base + save_counter(-1));
+  log6_opts(0, state->xid, (uint8_t *)daemon->outpacket.iov_base + start_opts, (uint8_t *)daemon->outpacket.iov_base + save_counter(-1));
   
   return 1;
 
@@ -2093,7 +2093,7 @@ static void log6_packet(struct state *state, char *type, struct in6_addr *addr,
 	      string ? string : "");
 }
 
-static void *opt6_find (void *opts, void *end, unsigned int search, unsigned int minsize)
+static void *opt6_find (uint8_t *opts, uint8_t *end, unsigned int search, unsigned int minsize)
 {
   u16 opt, opt_len;
   void *start;
@@ -2120,7 +2120,7 @@ static void *opt6_find (void *opts, void *end, unsigned int search, unsigned int
     }
 }
 
-static void *opt6_next(void *opts, void *end)
+static void *opt6_next(uint8_t *opts, uint8_t *end)
 {
   u16 opt_len;
   

src/util.c

@@ -41,7 +41,7 @@ static u32 in[12];
 static u32 out[8];
 static int outleft = 0;
 
-void rand_init()
+void rand_init(void)
 {
   int fd = open(RANDFILE, O_RDONLY);