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1.1.2.1 misho 1: #include "global.h"
2:
3:
1.1.2.2 misho 4: /*
5: * io_get1stiface() - Get first interface of host
6: *
7: * @szIface = interface string buffer
8: * @iflen = size of interface buffer
9: * return: -1 error or 0 ok
10: */
11: int
12: io_get1stiface(char *szIface, int iflen)
13: {
14: struct ifaddrs *ifa;
15:
16: if (!szIface || !iflen)
17: return -1;
18:
19: getifaddrs(&ifa);
20: strlcpy(szIface, ifa->ifa_name, iflen);
21: freeifaddrs(ifa);
22: return 0;
23: }
24:
25: /*
26: * io_etherClose() - Close BPF interface
27: *
28: * @eth = bpf handle
1.1.2.3 misho 29: * @zcbuf = zero copy buffer, if BPF supports it and isn't NULL
1.1.2.2 misho 30: * return: none
31: */
32: void
1.1.2.3 misho 33: io_etherClose(int eth, void **zcbuf)
1.1.2.2 misho 34: {
1.1.2.3 misho 35: #ifdef __FreeBSD__
36: struct bpf_zbuf *zbuf = NULL;
37: #endif
38:
1.1.2.2 misho 39: if (eth > STDERR_FILENO)
40: close(eth);
1.1.2.3 misho 41:
42: if (zcbuf && *zcbuf) {
43: #ifdef __FreeBSD__
44: zbuf = *zcbuf;
45: munmap(zbuf->bz_bufb, zbuf->bz_buflen);
46: munmap(zbuf->bz_bufa, zbuf->bz_buflen);
47: e_free(*zcbuf);
48: *zcbuf = NULL;
49: #endif
50: }
51: }
52:
53: #ifdef __FreeBSD__
54: static inline struct bpf_zbuf *
55: allocZCbuf(u_int len)
56: {
57: struct bpf_zbuf *zbuf = NULL;
58:
59: zbuf = e_malloc(sizeof(struct bpf_zbuf));
60: if (!zbuf) {
61: io_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
62: return NULL;
63: } else
64: memset(zbuf, 0, sizeof(struct bpf_zbuf));
65:
66: zbuf->bz_buflen = roundup(len, getpagesize());
67: zbuf->bz_bufa = mmap(NULL, zbuf->bz_buflen, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
68: if (zbuf->bz_bufa == MAP_FAILED) {
69: LOGERR;
70: e_free(zbuf);
71: return NULL;
72: } else
73: memset(zbuf->bz_bufa, 0, zbuf->bz_buflen);
74: zbuf->bz_bufb = mmap(NULL, zbuf->bz_buflen, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0);
75: if (zbuf->bz_bufb == MAP_FAILED) {
76: LOGERR;
77: munmap(zbuf->bz_bufa, zbuf->bz_buflen);
78: e_free(zbuf);
79: return NULL;
80: } else
81: memset(zbuf->bz_bufb, 0, zbuf->bz_buflen);
82:
83: return zbuf;
1.1.2.2 misho 84: }
1.1.2.3 misho 85: #endif
1.1.2.2 misho 86:
87: /*
88: * io_etherOpen() - Open BPF interface to device
89: *
90: * @csIface = interface name
91: * @flags = open flags
1.1.2.3 misho 92: * @whdr = with complete headers
93: * @buflen = buffer length
94: * @zcbuf = zero copy buffer, if BPF supports it and isn't NULL
1.1.2.2 misho 95: * return: -1 error or >-1 bpf handle
96: */
97: int
1.1.2.4 ! misho 98: io_etherOpen(const char *csIface, int flags, int whdr, u_int *buflen, void **zcbuf)
1.1.2.2 misho 99: {
100: int n = 1, eth = -1;
101: register int i;
102: char szStr[STRSIZ];
103: struct ifreq ifr;
104:
105: for (i = 0; i < BPF_DEV_MAX; i++) {
106: memset(szStr, 0, sizeof szStr);
107: snprintf(szStr, sizeof szStr, "/dev/bpf%d", i);
108: eth = open(szStr, flags);
109: if (eth > STDERR_FILENO)
110: break;
111: }
112: if (eth < 3) {
113: LOGERR;
114: return -1;
115: }
116:
117: if (ioctl(eth, BIOCIMMEDIATE, &n) == -1) {
118: LOGERR;
119: close(eth);
120: return -1;
121: }
1.1.2.3 misho 122: if (whdr && ioctl(eth, BIOCSHDRCMPLT, &n) == -1) {
1.1.2.2 misho 123: LOGERR;
124: close(eth);
125: return -1;
126: }
1.1.2.4 ! misho 127: if (buflen && *buflen) {
1.1.2.3 misho 128: if (!zcbuf) {
1.1.2.4 ! misho 129: if (ioctl(eth, BIOCSBLEN, buflen) == -1) {
1.1.2.3 misho 130: LOGERR;
131: close(eth);
132: return -1;
133: }
134: } else {
135: #ifdef __FreeBSD__
136: n = BPF_BUFMODE_ZBUF;
137: if (ioctl(eth, BIOCSETBUFMODE, &n) == -1) {
138: LOGERR;
139: close(eth);
140: return -1;
141: }
142: if (ioctl(eth, BIOCGETZMAX, &n) == -1) {
143: LOGERR;
144: close(eth);
145: return -1;
146: }
1.1.2.4 ! misho 147: if (!(*zcbuf = allocZCbuf(MIN(n, *buflen)))) {
1.1.2.3 misho 148: close(eth);
149: return -1;
150: }
151: if (ioctl(eth, BIOCSETZBUF, (struct bpf_zbuf*) *zcbuf) == -1) {
152: LOGERR;
153: io_etherClose(eth, zcbuf);
154: return -1;
155: }
156: #endif
157: }
158: }
1.1.2.2 misho 159: if (csIface)
160: strlcpy(szStr, csIface, sizeof szStr);
161: else if (io_get1stiface(szStr, sizeof szStr) == -1) {
1.1.2.3 misho 162: io_etherClose(eth, zcbuf);
1.1.2.2 misho 163: return -1;
164: }
165: strlcpy(ifr.ifr_name, szStr, sizeof ifr.ifr_name);
166: if (ioctl(eth, BIOCSETIF, &ifr) == -1) {
167: LOGERR;
1.1.2.3 misho 168: io_etherClose(eth, zcbuf);
1.1.2.2 misho 169: return -1;
170: }
171:
172: return eth;
173: }