adding

diff --git a/src/icmp.cc b/src/icmp.cc
new file mode 100644 (file)
index 0000000..effd629
--- /dev/null
+++ b/src/icmp.cc
@@ -0,0 +1,130 @@
+
+#include "squid.h"
+
+#include <netinet/in_systm.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+
+#ifndef _SQUID_LINUX_
+#define icmphdr icmp
+#define iphdr ip
+#endif
+
+#ifdef _SQUID_LINUX_
+#define icmp_type type
+#define icmp_code code
+#define icmp_cksum checksum
+#define icmp_id un.echo.id
+#define icmp_seq un.echo.sequence
+#define icmp_gwaddr un.gateway
+#define ip_hl ihl
+#define ip_v version
+#define ip_tos tos
+#define ip_len tot_len
+#define ip_id id
+#define ip_off frag_off
+#define ip_ttl ttl
+#define ip_p protocol
+#define ip_sum check
+#define ip_src saddr
+#define ip_dst daddr
+#endif
+
+int icmp_sock = -1;
+
+static int icmp_ident = -1;
+static int icmp_pkts_sent = 0;
+
+static int in_cksum __P((unsigned short *ptr, int size));
+
+void
+icmpOpen(void)
+{
+    struct protoent *proto = NULL;
+    if ((proto = getprotobyname("icmp")) == 0) {
+       debug(37, 0, "icmpOpen: unknown protocol: icmp\n");
+       return;
+    }
+    enter_suid();
+    if ((icmp_sock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) {
+       debug(37, 0, "icmpOpen: icmp_sock: %s\n", xstrerror());
+       return;
+    }
+    leave_suid();
+    icmp_ident = getpid() & 0xffff;
+    debug(37, 0, "icmpOpen: icmp_sock opened on FD %d\n", icmp_sock);
+}
+
+void 
+icmpClose(void)
+{
+    comm_close(icmp_sock);
+    icmp_sock = -1;
+    icmp_ident = 0;
+}
+
+void
+icmpSendEcho(struct in_addr to, char *payload, int len)
+{
+    char *pkt = NULL;
+    struct icmphdr *icp = NULL;
+    struct timeval *tv;
+    int icmp_pktsize = sizeof(struct icmphdr) + sizeof(struct timeval);
+    int i;
+    pkt = get_free_8k_page();
+    memset(pkt, '\0', 8192);
+    icp = (struct icmphdr *) pkt;
+    icp->icmp_type = ICMP_ECHO;
+    icp->icmp_code = 0;
+    icp->icmp_cksum = 0;
+    icp->icmp_id = icmp_ident;
+    icp->icmp_seq = icmp_pkts_sent++;
+    tv = (struct timeval *) (pkt + sizeof(struct icmphdr));
+    *tv = current_time;
+    if (payload) {
+       if (len > (8192 - icmp_pktsize))
+           len = 8192 - icmp_pktsize;
+       memcpy(pkt + icmp_pktsize, payload, len);
+       icmp_pktsize += len;
+    }
+    icp->icmp_cksum = in_cksum((u_short *) icp, icmp_pktsize);
+    i = sendto(icmp_sock, pkt, icmp_pktsize, 0,
+       (struct sockaddr *) &to, sizeof(struct sockaddr_in));
+    if (i < 0)
+       debug(37, 0, "icmpSendEcho: sendto: %s\n", xstrerror());
+    else if (i != icmp_pktsize)
+       debug(37, 0, "icmpSendEcho: Only wrote %d of %d bytes\n",
+           i, icmp_pktsize);
+}
+
+void 
+icmpRecv(void)
+{
+}
+
+
+int 
+in_cksum(unsigned short *ptr, int size)
+{
+
+    register long sum;
+    unsigned short oddbyte;
+    register unsigned short answer;
+
+    sum = 0;
+    while (size > 1) {
+       sum += *ptr++;
+       size -= 2;
+    }
+
+    if (size == 1) {
+       oddbyte = 0;
+       *((unsigned char *) &oddbyte) = *(unsigned char *) ptr;
+       sum += oddbyte;
+    }
+    sum = (sum >> 16) + (sum & 0xffff);
+    sum += (sum >> 16);
+    answer = ~sum;
+    return (answer);
+}