Hello All: Recently I use iptables to write a application and find that it seem has a memory leak, I am not sure whether it is really leak, and howto solved it, so ask for help from this, thank you for your help. I check the memory leak by this way, it will not have problem when it run one time, but when I put iptables in my program to run thousand of rules, the menory increase by mega bytes... step 1: Modify the Makefile and let the flag be this: COPT_FLAGS:=-O2 -g step 2: I put the mtrace(); at the first of do_command fuction in iptables-standalone.c like this: ...... const char *modprobe = NULL; mtrace(); memset(&fw, 0, sizeof(fw)); ...... step 3: run the program and check the leak [root@dev01 iptables-1.2.5]# export MALLOC_TRACE=mymemory.log [root@dev01 iptables-1.2.5]# ./iptables -t nat -A POSTROUTING -j MASQUERADE -s 192.168.1.200 [root@dev01 iptables-1.2.5]# mtrace ./iptables ./mymemory.log Memory not freed: ----------------- Address Size Caller 0x08053038 0x2d at /lib/ld-linux.so.2:(_dl_map_object+0x355)[0x400070d9] 0x08053070 0x22c at /lib/ld-linux.so.2:(_dl_lookup_versioned_symbol_skip+0x9cb)[0x40008f4b] 0x080532a0 0x35 at /lib/ld-linux.so.2:(_dl_lookup_versioned_symbol_skip+0x9da)[0x40008f5a] 0x080532e0 0x2d at /lib/ld-linux.so.2:(_dl_lookup_versioned_symbol_skip+0xb31)[0x400090b1] 0x08053318 0x4 at /lib/ld-linux.so.2:(_dl_map_object_deps+0x80f)[0x4000a45f] 0x08053328 0x34 at /home/dev/iptables-1.2.5/iptables.c:498 0x08053360 0x210 at /home/dev/iptables-1.2.5/iptables.c:966 0x08053578 0x4 at /home/dev/iptables-1.2.5/iptables.c:510 0x08053588 0x4 at /home/dev/iptables-1.2.5/iptables.c:510 0x08053c18 0xa4 at /home/dev/iptables-1.2.5/iptables.c:510 the relate source: static void * fw_calloc(size_t count, size_t size) { void *p; if ((p = calloc(count, size)) == NULL) { //498 perror("iptables: calloc failed"); exit(1); } return p; } static struct in_addr * host_to_addr(const char *name, unsigned int *naddr) { struct hostent *host; struct in_addr *addr; unsigned int i; *naddr = 0; if ((host = gethostbyname(name)) != NULL) { if (host->h_addrtype != AF_INET || host->h_length != sizeof(struct in_addr)) return (struct in_addr *) NULL; while (host->h_addr_list[*naddr] != (char *) NULL) (*naddr)++; addr = fw_calloc(*naddr, sizeof(struct in_addr)); // 510 for (i = 0; i < *naddr; i++) inaddrcpy(&(addr[i]), (struct in_addr *) host->h_addr_list[i]); return addr; } return (struct in_addr *) NULL; } static struct option * merge_options(struct option *oldopts, const struct option *newopts, unsigned int *option_offset) { unsigned int num_old, num_new, i; struct option *merge; for (num_old = 0; oldopts[num_old].name; num_old++); for (num_new = 0; newopts[num_new].name; num_new++); global_option_offset += OPTION_OFFSET; *option_offset = global_option_offset; merge = malloc(sizeof(struct option) * (num_new + num_old + 1)); //966 memcpy(merge, oldopts, num_old * sizeof(struct option)); for (i = 0; i < num_new; i++) { merge[num_old + i] = newopts[i]; merge[num_old + i].val += *option_offset; } memset(merge + num_old + num_new, 0, sizeof(struct option)); return merge; } Best Regards. LSQ TEL:13500011809 E-mail:[EMAIL PROTECTED] Homepage:www.freelsq.org Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com |
