diff options
Diffstat (limited to 'sys/netinet/ip_ftp_pxy.c')
-rw-r--r-- | sys/netinet/ip_ftp_pxy.c | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/sys/netinet/ip_ftp_pxy.c b/sys/netinet/ip_ftp_pxy.c deleted file mode 100644 index 917dbb2..0000000 --- a/sys/netinet/ip_ftp_pxy.c +++ /dev/null @@ -1,260 +0,0 @@ -/* - * Simple FTP transparent proxy for in-kernel use. For use with the NAT - * code. - * - * $FreeBSD$ - */ - -#define isdigit(x) ((x) >= '0' && (x) <= '9') - -#define IPF_FTP_PROXY - -#define IPF_MINPORTLEN 18 -#define IPF_MAXPORTLEN 30 - - -int ippr_ftp_init __P((fr_info_t *, ip_t *, tcphdr_t *, - ap_session_t *, nat_t *)); -int ippr_ftp_in __P((fr_info_t *, ip_t *, tcphdr_t *, - ap_session_t *, nat_t *)); -int ippr_ftp_out __P((fr_info_t *, ip_t *, tcphdr_t *, - ap_session_t *, nat_t *)); -u_short ipf_ftp_atoi __P((char **)); - - -/* - * FTP application proxy initialization. - */ -int ippr_ftp_init(fin, ip, tcp, aps, nat) -fr_info_t *fin; -ip_t *ip; -tcphdr_t *tcp; -ap_session_t *aps; -nat_t *nat; -{ - aps->aps_sport = tcp->th_sport; - aps->aps_dport = tcp->th_dport; - return 0; -} - - -int ippr_ftp_in(fin, ip, tcp, aps, nat) -fr_info_t *fin; -ip_t *ip; -tcphdr_t *tcp; -ap_session_t *aps; -nat_t *nat; -{ - u_32_t sum1, sum2; - short sel; - - if (tcp->th_sport == aps->aps_dport) { - sum2 = (u_32_t)ntohl(tcp->th_ack); - sel = aps->aps_sel; - if ((aps->aps_after[!sel] > aps->aps_after[sel]) && - (sum2 > aps->aps_after[!sel])) { - sel = aps->aps_sel = !sel; /* switch to other set */ - } - if (aps->aps_seqoff[sel] && (sum2 > aps->aps_after[sel])) { - sum1 = (u_32_t)aps->aps_seqoff[sel]; - tcp->th_ack = htonl(sum2 - sum1); - return 2; - } - } - return 0; -} - - -/* - * ipf_ftp_atoi - implement a version of atoi which processes numbers in - * pairs separated by commas (which are expected to be in the range 0 - 255), - * returning a 16 bit number combining either side of the , as the MSB and - * LSB. - */ -u_short ipf_ftp_atoi(ptr) -char **ptr; -{ - register char *s = *ptr, c; - register u_char i = 0, j = 0; - - while ((c = *s++) && isdigit(c)) { - i *= 10; - i += c - '0'; - } - if (c != ',') { - *ptr = NULL; - return 0; - } - while ((c = *s++) && isdigit(c)) { - j *= 10; - j += c - '0'; - } - *ptr = s; - return (i << 8) | j; -} - - -int ippr_ftp_out(fin, ip, tcp, aps, nat) -fr_info_t *fin; -ip_t *ip; -tcphdr_t *tcp; -ap_session_t *aps; -nat_t *nat; -{ - register u_32_t sum1, sum2; - char newbuf[IPF_MAXPORTLEN+1]; - char portbuf[IPF_MAXPORTLEN+1], *s; - int ch = 0, off = (ip->ip_hl << 2) + (tcp->th_off << 2); - u_int a1, a2, a3, a4; - u_short a5, a6; - int olen, dlen, nlen = 0, inc = 0; - tcphdr_t tcph, *tcp2 = &tcph; - void *savep; - nat_t *ipn; - struct in_addr swip; - mb_t *m = *(mb_t **)fin->fin_mp; - -#if SOLARIS - mb_t *m1; - - /* skip any leading M_PROTOs */ - while(m && (MTYPE(m) != M_DATA)) - m = m->b_cont; - PANIC((!m),("ippr_ftp_out: no M_DATA")); - - dlen = msgdsize(m) - off; - bzero(portbuf, sizeof(portbuf)); - copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf); -#else - dlen = mbufchainlen(m) - off; - bzero(portbuf, sizeof(portbuf)); - m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf); -#endif - portbuf[IPF_MAXPORTLEN] = '\0'; - - if ((dlen < IPF_MINPORTLEN) || strncmp(portbuf, "PORT ", 5)) - goto adjust_seqack; - - /* - * Skip the PORT command + space - */ - s = portbuf + 5; - /* - * Pick out the address components, two at a time. - */ - (void) ipf_ftp_atoi(&s); - if (!s) - goto adjust_seqack; - (void) ipf_ftp_atoi(&s); - if (!s) - goto adjust_seqack; - a5 = ipf_ftp_atoi(&s); - if (!s) - goto adjust_seqack; - /* - * check for CR-LF at the end. - */ - if (*s != '\n' || *(s - 1) != '\r') - goto adjust_seqack; - a6 = a5 & 0xff; - a5 >>= 8; - /* - * Calculate new address parts for PORT command - */ - a1 = ntohl(ip->ip_src.s_addr); - a2 = (a1 >> 16) & 0xff; - a3 = (a1 >> 8) & 0xff; - a4 = a1 & 0xff; - a1 >>= 24; - olen = s - portbuf + 1; - (void) snprintf(newbuf, sizeof(newbuf), "PORT %d,%d,%d,%d,%d,%d\r\n", - a1, a2, a3, a4, a5, a6); - nlen = strlen(newbuf); - inc = nlen - olen; -#if SOLARIS - for (m1 = m; m1->b_cont; m1 = m1->b_cont) - ; - if (inc > 0) { - mblk_t *nm; - - /* alloc enough to keep same trailer space for lower driver */ - nm = allocb(nlen + m1->b_datap->db_lim - m1->b_wptr, BPRI_MED); - PANIC((!nm),("ippr_ftp_out: allocb failed")); - - nm->b_band = m1->b_band; - nm->b_wptr += nlen; - - m1->b_wptr -= olen; - PANIC((m1->b_wptr < m1->b_rptr),("ippr_ftp_out: cannot handle fragmented data block")); - - linkb(m1, nm); - } else { - m1->b_wptr += inc; - } - copyin_mblk(m, off, nlen, newbuf); -#else - if (inc < 0) - m_adj(m, inc); - /* the mbuf chain will be extended if necessary by m_copyback() */ - m_copyback(m, off, nlen, newbuf); -#endif - if (inc) { -#if SOLARIS || defined(__sgi) - sum1 = ip->ip_len; - sum2 = ip->ip_len + inc; - - /* Because ~1 == -2, We really need ~1 == -1 */ - if (sum1 > sum2) - sum2--; - sum2 -= sum1; - sum2 = (sum2 & 0xffff) + (sum2 >> 16); - - fix_outcksum(&ip->ip_sum, sum2); -#endif - ip->ip_len += inc; - } - ch = 1; - - /* - * Add skeleton NAT entry for connection which will come back the - * other way. - */ - savep = fin->fin_dp; - fin->fin_dp = (char *)tcp2; - bzero((char *)tcp2, sizeof(*tcp2)); - tcp2->th_sport = htons(a5 << 8 | a6); - tcp2->th_dport = htons(20); - swip = ip->ip_src; - ip->ip_src = nat->nat_inip; - if ((ipn = nat_new(nat->nat_ptr, ip, fin, IPN_TCP, NAT_OUTBOUND))) - ipn->nat_age = fr_defnatage; - (void) fr_addstate(ip, fin, FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE); - ip->ip_src = swip; - fin->fin_dp = (char *)savep; - -adjust_seqack: - if (tcp->th_dport == aps->aps_dport) { - sum2 = (u_32_t)ntohl(tcp->th_seq); - off = aps->aps_sel; - if ((aps->aps_after[!off] > aps->aps_after[off]) && - (sum2 > aps->aps_after[!off])) { - off = aps->aps_sel = !off; /* switch to other set */ - } - if (aps->aps_seqoff[off]) { - sum1 = (u_32_t)aps->aps_after[off] - - aps->aps_seqoff[off]; - if (sum2 > sum1) { - sum1 = (u_32_t)aps->aps_seqoff[off]; - sum2 += sum1; - tcp->th_seq = htonl(sum2); - ch = 1; - } - } - - if (inc && (sum2 > aps->aps_after[!off])) { - aps->aps_after[!off] = sum2 + nlen - 1; - aps->aps_seqoff[!off] = aps->aps_seqoff[off] + inc; - } - } - return ch ? 2 : 0; -} |