arping: Break libsysfs dependency Port Fedora 17's iputils-20071127-infiniband.patch, which inlines sysfs access previously done by libsysfs (which is in /usr, and thus not usable by /bin/arping). Upstream-Status: Inappropriate [not author] Signed-off-by: Andy Ross --- Makefile | 2 +- arping.c | 152 ++++++++++++++++++++++++++++++++++++++++++++------------------ 2 files changed, 109 insertions(+), 45 deletions(-) diff --git a/Makefile b/Makefile index d9a5ca5..943f048 100644 --- a/Makefile +++ b/Makefile @@ -27,7 +27,7 @@ all: $(TARGETS) tftpd: tftpd.o tftpsubs.o -arping: arping.o -lsysfs +arping: arping.o ping: ping.o ping_common.o ping6: ping6.o ping_common.o -lresolv -lcrypto ping.o ping6.o ping_common.o: ping_common.h diff --git a/arping.c b/arping.c index 13484de..6379354 100644 --- a/arping.c +++ b/arping.c @@ -32,8 +32,6 @@ #include #include -#include - #include "SNAPSHOT.h" static void usage(void) __attribute__((noreturn)); @@ -52,14 +50,22 @@ int unicasting; int s; int broadcast_only; -struct sockaddr_storage me; -struct sockaddr_storage he; +struct sockaddr_ll *me=NULL; +struct sockaddr_ll *he=NULL; struct timeval start, last; int sent, brd_sent; int received, brd_recv, req_recv; +#define SYSFS_MNT_PATH "/sys" +#define SYSFS_CLASS "class" +#define SYSFS_NET "net" +#define SYSFS_BROADCAST "broadcast" +#define SYSFS_PATH_ENV "SYSFS_PATH" +#define SYSFS_PATH_LEN 256 +#define SOCKADDR_LEN (2 * sizeof(struct sockaddr_ll)) + #define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \ ((tv1).tv_usec-(tv2).tv_usec)/1000 ) @@ -166,6 +172,10 @@ void finish(void) printf("\n"); fflush(stdout); } + + free(me); + free(he); + if (dad) exit(!!received); if (unsolicited) @@ -189,8 +199,7 @@ void catcher(void) finish(); if ( count!=0 && (last.tv_sec==0 || MS_TDIFF(tv,last) > 500 ) ) { - send_pack(s, src, dst, - (struct sockaddr_ll *)&me, (struct sockaddr_ll *)&he); + send_pack(s, src, dst, me, he); if (count >= 0) count--; if (count == 0 && unsolicited) @@ -239,7 +248,7 @@ int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) return 0; if (ah->ar_pln != 4) return 0; - if (ah->ar_hln != ((struct sockaddr_ll *)&me)->sll_halen) + if (ah->ar_hln != me->sll_halen) return 0; if (len < sizeof(*ah) + 2*(4 + ah->ar_hln)) return 0; @@ -250,7 +259,7 @@ int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) return 0; if (src.s_addr != dst_ip.s_addr) return 0; - if (memcmp(p+ah->ar_hln+4, ((struct sockaddr_ll *)&me)->sll_addr, ah->ar_hln)) + if (memcmp(p+ah->ar_hln+4, me->sll_addr, ah->ar_hln)) return 0; } else { /* DAD packet was: @@ -268,7 +277,7 @@ int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) */ if (src_ip.s_addr != dst.s_addr) return 0; - if (memcmp(p, ((struct sockaddr_ll *)&me)->sll_addr, ((struct sockaddr_ll *)&me)->sll_halen) == 0) + if (memcmp(p, me->sll_addr, me->sll_halen) == 0) return 0; if (src.s_addr && src.s_addr != dst_ip.s_addr) return 0; @@ -284,7 +293,7 @@ int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) printf("for %s ", inet_ntoa(dst_ip)); s_printed = 1; } - if (memcmp(p+ah->ar_hln+4, ((struct sockaddr_ll *)&me)->sll_addr, ah->ar_hln)) { + if (memcmp(p+ah->ar_hln+4, me->sll_addr, ah->ar_hln)) { if (!s_printed) printf("for "); printf("["); @@ -310,40 +319,67 @@ int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) if (quit_on_reply) finish(); if(!broadcast_only) { - memcpy(((struct sockaddr_ll *)&he)->sll_addr, p, ((struct sockaddr_ll *)&me)->sll_halen); + memcpy(he->sll_addr, p, me->sll_halen); unicasting=1; } return 1; } -void set_device_broadcast(char *device, unsigned char *ba, size_t balen) +int get_sysfs_mnt_path(char *mnt_path, size_t len) { - struct sysfs_class_device *dev; - struct sysfs_attribute *brdcast; - unsigned char *p; - int ch; + const char *sysfs_path_env; + int pth_len=0; - dev = sysfs_open_class_device("net", device); - if (!dev) { - perror("sysfs_open_class_device(net)"); - exit(2); - } + if (len == 0 || mnt_path == NULL) + return -1; - brdcast = sysfs_get_classdev_attr(dev, "broadcast"); - if (!brdcast) { - perror("sysfs_get_classdev_attr(broadcast)"); - exit(2); - } + /* possible overrride of real mount path */ + sysfs_path_env = getenv(SYSFS_PATH_ENV); + memset(mnt_path, 0, len); + strncpy(mnt_path, + sysfs_path_env != NULL ? sysfs_path_env : SYSFS_MNT_PATH, + len-1); - if (sysfs_read_attribute(brdcast)) { - perror("sysfs_read_attribute"); - exit(2); - } + if ((pth_len = strlen(mnt_path)) > 0 && mnt_path[pth_len-1] == '/') + mnt_path[pth_len-1] = '\0'; + + return 0; +} + +int make_sysfs_broadcast_path(char *broadcast_path, size_t len) +{ + char mnt_path[SYSFS_PATH_LEN]; + + if (get_sysfs_mnt_path(mnt_path, len) != 0) + return -1; - for (p = ba, ch = 0; p < ba + balen; p++, ch += 3) - *p = strtoul(brdcast->value + ch, NULL, 16); + snprintf(broadcast_path, len, + "%s/" SYSFS_CLASS "/" SYSFS_NET "/%s/" SYSFS_BROADCAST, + mnt_path, device); - return; + return 0; +} + +char * read_sysfs_broadcast(char *brdcast_path) +{ + int fd; + int len_to_read; + char *brdcast = NULL; + + if ((fd = open(brdcast_path, O_RDONLY)) > -1) { + len_to_read = lseek(fd, 0L, SEEK_END); + if ((brdcast = malloc(len_to_read+1)) != NULL) { + lseek(fd, 0L, SEEK_SET); + memset(brdcast, 0, len_to_read+1); + if (read(fd, brdcast, len_to_read) == -1) { + free(brdcast); + brdcast = NULL; + } + } + close(fd); + } + + return brdcast; } int @@ -361,6 +397,17 @@ main(int argc, char **argv) exit(-1); } + me = malloc(SOCKADDR_LEN); + if (!me) { + fprintf(stderr, "arping: could not allocate memory\n"); + exit(1); + } + he = malloc(SOCKADDR_LEN); + if (!he) { + fprintf(stderr, "arping: could not allocate memory\n"); + exit(1); + } + while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:V")) != EOF) { switch(ch) { case 'b': @@ -509,34 +556,51 @@ main(int argc, char **argv) close(probe_fd); }; - ((struct sockaddr_ll *)&me)->sll_family = AF_PACKET; - ((struct sockaddr_ll *)&me)->sll_ifindex = ifindex; - ((struct sockaddr_ll *)&me)->sll_protocol = htons(ETH_P_ARP); - if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) { + me->sll_family = AF_PACKET; + me->sll_ifindex = ifindex; + me->sll_protocol = htons(ETH_P_ARP); + if (bind(s, (struct sockaddr*)me, SOCKADDR_LEN) == -1) { perror("bind"); exit(2); } if (1) { - socklen_t alen = sizeof(me); - if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) { + socklen_t alen = SOCKADDR_LEN; + if (getsockname(s, (struct sockaddr*)me, &alen) == -1) { perror("getsockname"); exit(2); } } - if (((struct sockaddr_ll *)&me)->sll_halen == 0) { + if (me->sll_halen == 0) { if (!quiet) printf("Interface \"%s\" is not ARPable (no ll address)\n", device); exit(dad?0:2); } - he = me; + memcpy(he, me, SOCKADDR_LEN); #if 1 - set_device_broadcast(device, ((struct sockaddr_ll *)&he)->sll_addr, - ((struct sockaddr_ll *)&he)->sll_halen); + char brdcast_path[SYSFS_PATH_LEN]; + char *brdcast_val=NULL; + char *next_ch; + + if (make_sysfs_broadcast_path(brdcast_path, sizeof brdcast_path) != 0) { + perror("sysfs attribute broadcast"); + exit(2); + } + + if ((brdcast_val = read_sysfs_broadcast(brdcast_path)) == NULL) { + perror("sysfs read broadcast value"); + exit(2); + } + + for (ch=0; chsll_halen; ch++) { + he->sll_addr[ch] = strtol(brdcast_val + (ch*3), &next_ch, 16); + } + + free(brdcast_val); #else - memset(((struct sockaddr_ll *)&he)->sll_addr, -1, ((struct sockaddr_ll *)&he)->sll_halen); + memset(he->sll_addr, -1, he->sll_halen); #endif if (!quiet) { -- 1.7.10.4