| 1 | /* net.c Copyright 1992-2000 by Michael Temari All Rights Reserved
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| 2 | *
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| 3 | * This file is part of ftpd.
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| 4 | *
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| 5 | * This file handles:
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| 6 | *
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| 7 | * PASV PORT
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| 8 | *
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| 9 | *
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| 10 | * 01/25/1995 Initial Release Michael Temari, <Michael@TemWare.Com>
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| 11 | * 02/09/2005 Initial Release Michael Temari, <Michael@TemWare.Com>
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| 12 | */
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| 13 |
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| 14 | #include <sys/types.h>
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| 15 | #include <sys/ioctl.h>
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| 16 | #include <sys/wait.h>
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| 17 | #include <stdio.h>
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| 18 | #include <stdlib.h>
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| 19 | #include <string.h>
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| 20 | #include <errno.h>
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| 21 | #include <fcntl.h>
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| 22 | #include <signal.h>
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| 23 | #include <unistd.h>
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| 24 | #include <time.h>
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| 25 | #include <net/netlib.h>
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| 26 | #include <net/hton.h>
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| 27 | #include <net/gen/in.h>
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| 28 | #include <net/gen/inet.h>
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| 29 | #include <net/gen/tcp.h>
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| 30 | #include <net/gen/tcp_io.h>
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| 31 | #include <net/gen/socket.h>
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| 32 | #include <net/gen/netdb.h>
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| 33 |
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| 34 | #include "ftpd.h"
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| 35 | #include "access.h"
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| 36 | #include "net.h"
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| 37 |
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| 38 | _PROTOTYPE(static void timeout, (int sig));
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| 39 |
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| 40 | static char *msg425 = "425-Could not open data connection.\r\n";
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| 41 | static char *msg501 = "501 Syntax error in parameters.\r\n";
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| 42 |
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| 43 | static int gottimeout = 0;
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| 44 | static int lpid = -1;
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| 45 | static int didpassive = 0;
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| 46 |
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| 47 | /* they must be behind a firewall or using a web browser */
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| 48 | int doPASV(buff)
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| 49 | char *buff;
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| 50 | {
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| 51 | nwio_tcpconf_t tcpconf;
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| 52 | nwio_tcpcl_t tcplopt;
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| 53 | char *tcp_device;
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| 54 | ipaddr_t ipaddr;
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| 55 | tcpport_t lport;
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| 56 | int s;
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| 57 | time_t starttime;
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| 58 | int retry;
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| 59 |
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| 60 | if(ChkLoggedIn())
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| 61 | return(GOOD);
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| 62 |
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| 63 | CleanUpPasv();
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| 64 |
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| 65 | /* here we set up a connection to listen on */
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| 66 | if((tcp_device = getenv("TCP_DEVICE")) == NULL)
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| 67 | tcp_device = TCP_DEVICE;
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| 68 |
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| 69 | if(ftpdata_fd >= 0) {
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| 70 | close(ftpdata_fd);
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| 71 | ftpdata_fd = -1;
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| 72 | }
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| 73 |
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| 74 | if((ftpdata_fd = open(tcp_device, O_RDWR)) < 0) {
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| 75 | printf(msg425);
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| 76 | printf("425 Could not open tcp_device. Error %s\r\n", strerror(errno));
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| 77 | return(GOOD);
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| 78 | }
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| 79 |
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| 80 | tcpconf.nwtc_flags = NWTC_LP_SEL | NWTC_SET_RA | NWTC_UNSET_RP;
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| 81 |
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| 82 | tcpconf.nwtc_remaddr = rmtipaddr;
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| 83 | tcpconf.nwtc_remport = htons(0);
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| 84 | tcpconf.nwtc_locport = htons(0);
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| 85 |
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| 86 | s = ioctl(ftpdata_fd, NWIOSTCPCONF, &tcpconf);
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| 87 | if(s < 0) {
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| 88 | printf(msg425);
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| 89 | printf("425 Could not ioctl NWIOSTCPCONF. Error %s\r\n", strerror(errno));
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| 90 | close(ftpdata_fd);
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| 91 | ftpdata_fd = -1;
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| 92 | return(GOOD);
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| 93 | }
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| 94 |
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| 95 | s = ioctl(ftpdata_fd, NWIOGTCPCONF, &tcpconf);
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| 96 | if(s < 0) {
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| 97 | printf(msg425);
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| 98 | printf("425 Could not NWIOGTCPCONF. Error %s\r\n", strerror(errno));
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| 99 | close(ftpdata_fd);
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| 100 | ftpdata_fd = -1;
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| 101 | return(GOOD);
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| 102 | }
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| 103 | ipaddr = tcpconf.nwtc_locaddr;
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| 104 | lport = tcpconf.nwtc_locport;
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| 105 |
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| 106 | /* Now lets fork a child to do the listening :-( */
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| 107 |
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| 108 | tcplopt.nwtcl_flags = 0;
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| 109 |
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| 110 | lpid = fork();
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| 111 | if(lpid < 0) {
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| 112 | printf(msg425);
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| 113 | printf("425 Could not fork listener. Error %s\r\n", strerror(errno));
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| 114 | close(ftpdata_fd);
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| 115 | ftpdata_fd = -1;
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| 116 | return(GOOD);
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| 117 | } else if(lpid == 0) {
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| 118 | retry = 0;
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| 119 | while(1) {
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| 120 | #ifdef DEBUG
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| 121 | fprintf(logfile, "ftpd: child %d parent %d listen try %d\n", getpid(), getppid(), retry);
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| 122 | fflush(logfile);
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| 123 | #endif
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| 124 | s = ioctl(ftpdata_fd, NWIOTCPLISTEN, &tcplopt);
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| 125 | if(!(s == -1 && errno == EAGAIN)) break;
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| 126 | if(retry++ > 10) break;
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| 127 | sleep(1);
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| 128 | }
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| 129 | #ifdef DEBUG
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| 130 | fprintf(logfile, "ftpd: child %d s %d errno %d\n", getpid(), s, errno);
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| 131 | fflush(logfile);
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| 132 | #endif
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| 133 | if(s < 0)
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| 134 | exit(errno); /* tells parent listen failed */
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| 135 | else
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| 136 | exit(0); /* tells parent listen okay */
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| 137 | }
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| 138 |
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| 139 | #ifdef DEBUG
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| 140 | fprintf(logfile, "ftpd: parent %d wait for %d\n", getpid(), lpid);
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| 141 | fflush(logfile);
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| 142 | #endif
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| 143 |
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| 144 | /* wait for child to be listening, no more than serveral seconds */
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| 145 | (void) time(&starttime);
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| 146 | while(1) {
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| 147 | if(time((time_t *)NULL) > (starttime + 15)) break;
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| 148 | signal(SIGALRM, timeout);
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| 149 | alarm(1);
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| 150 | s = ioctl(ftpdata_fd, NWIOGTCPCONF, &tcpconf);
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| 151 | #ifdef DEBUG
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| 152 | fprintf(logfile, "ftpd: parent %d child %d s %d errno %d start %ld now %ld\n",
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| 153 | getpid(), lpid, s, errno, starttime, time((time_t *)NULL));
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| 154 | fflush(logfile);
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| 155 | #endif
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| 156 | alarm(0);
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| 157 | if(s == -1) break;
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| 158 | sleep(1);
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| 159 | }
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| 160 |
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| 161 | #define hiword(x) ((u16_t)((x) >> 16))
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| 162 | #define loword(x) ((u16_t)(x & 0xffff))
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| 163 | #define hibyte(x) (((x) >> 8) & 0xff)
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| 164 | #define lobyte(x) ((x) & 0xff)
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| 165 |
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| 166 | printf("227 Entering Passive Mode (%u,%u,%u,%u,%u,%u).\r\n",
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| 167 | hibyte(hiword(htonl(ipaddr))), lobyte(hiword(htonl(ipaddr))),
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| 168 | hibyte(loword(htonl(ipaddr))), lobyte(loword(htonl(ipaddr))),
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| 169 | hibyte(htons(lport)), lobyte(htons(lport)));
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| 170 |
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| 171 | #ifdef DEBUG
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| 172 | fprintf(logfile, "ftpd: parent %d child %d send 227\n", getpid(), lpid);
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| 173 | fflush(logfile);
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| 174 | #endif
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| 175 |
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| 176 | didpassive = -1;
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| 177 |
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| 178 | return(GOOD);
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| 179 | }
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| 180 |
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| 181 | /* they want us to connect here */
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| 182 | int doPORT(buff)
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| 183 | char *buff;
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| 184 | {
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| 185 | u32_t ipaddr;
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| 186 | u16_t port;
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| 187 | int i;
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| 188 |
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| 189 | if(ftpdata_fd >= 0) {
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| 190 | close(ftpdata_fd);
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| 191 | ftpdata_fd = -1;
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| 192 | }
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| 193 |
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| 194 | ipaddr = (u32_t)0;
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| 195 | for(i = 0; i < 4; i++) {
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| 196 | ipaddr = (ipaddr << 8) + (u32_t)atoi(buff);
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| 197 | if((buff = strchr(buff, ',')) == (char *)0) {
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| 198 | printf(msg501);
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| 199 | return(GOOD);
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| 200 | }
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| 201 | buff++;
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| 202 | }
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| 203 | port = (u16_t)atoi(buff);
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| 204 | if((buff = strchr(buff, ',')) == (char *)0) {
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| 205 | printf(msg501);
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| 206 | return(0);
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| 207 | }
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| 208 | buff++;
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| 209 | port = (port << 8) + (u16_t)atoi(buff);
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| 210 |
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| 211 | dataaddr = htonl(ipaddr);
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| 212 | dataport = htons(port);
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| 213 | if(dataaddr != rmtipaddr) {
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| 214 | printf(msg501);
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| 215 | return(GOOD);
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| 216 | }
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| 217 |
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| 218 | printf("200 Port command okay.\r\n");
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| 219 |
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| 220 | return(GOOD);
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| 221 | }
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| 222 |
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| 223 | /* connect, huh? */
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| 224 | int DataConnect()
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| 225 | {
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| 226 | nwio_tcpconf_t tcpconf;
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| 227 | nwio_tcpcl_t tcpcopt;
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| 228 | nwio_tcpcl_t tcplopt;
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| 229 | char *tcp_device;
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| 230 | int s, cs;
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| 231 | int retry;
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| 232 |
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| 233 | if(didpassive && ftpdata_fd >= 0) {
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| 234 | didpassive = 0;
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| 235 | gottimeout = 0;
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| 236 | signal(SIGALRM, timeout);
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| 237 | alarm(10);
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| 238 | while(!gottimeout) {
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| 239 | s = waitpid(lpid, &cs, 0);
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| 240 | if((s == lpid) || (s < 0 && errno == ECHILD)) break;
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| 241 | #ifdef DEBUG
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| 242 | fprintf(logfile, "ftpd: parent %d child %d waitpid s %d cs %04x errno %d\n", getpid(), lpid, s, cs, errno);
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| 243 | fflush(logfile);
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| 244 | #endif
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| 245 | }
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| 246 | alarm(0);
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| 247 | #ifdef DEBUG
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| 248 | fprintf(logfile, "ftpd: parent %d child %d waitpid s %d cs %04x errno %d\n", getpid(), lpid, s, cs, errno);
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| 249 | fflush(logfile);
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| 250 | #endif
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| 251 | if(gottimeout) {
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| 252 | #ifdef DEBUG
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| 253 | fprintf(logfile, "ftpd: parent %d child %d got timeout\n", getpid(), lpid);
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| 254 | fflush(logfile);
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| 255 | #endif
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| 256 | kill(lpid, SIGKILL);
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| 257 | s = waitpid(lpid, &cs, 0);
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| 258 | }
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| 259 | #ifdef DEBUG
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| 260 | fprintf(logfile, "ftpd: parent %d child %d continuing\n", getpid(), lpid);
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| 261 | fflush(logfile);
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| 262 | #endif
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| 263 | lpid = -1;
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| 264 | if(gottimeout) {
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| 265 | printf(msg425);
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| 266 | printf("425 Child listener timeout.\r\n");
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| 267 | close(ftpdata_fd);
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| 268 | ftpdata_fd = -1;
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| 269 | return(BAD);
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| 270 | }
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| 271 | if(s < 0) {
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| 272 | printf(msg425);
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| 273 | printf("425 Child listener vanished.\r\n");
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| 274 | close(ftpdata_fd);
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| 275 | ftpdata_fd = -1;
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| 276 | return(BAD);
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| 277 | }
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| 278 | if((cs & 0x00ff)) {
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| 279 | printf(msg425);
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| 280 | printf("425 Child listener failed %04x\r\n", cs);
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| 281 | close(ftpdata_fd);
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| 282 | ftpdata_fd = -1;
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| 283 | return(BAD);
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| 284 | }
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| 285 | cs = (cs >> 8) & 0x00ff;
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| 286 | if(cs) {
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| 287 | printf(msg425);
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| 288 | printf("425 Child listener error %s\r\n", strerror(cs));
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| 289 | close(ftpdata_fd);
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| 290 | ftpdata_fd = -1;
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| 291 | return(BAD);
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| 292 | }
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| 293 | #ifdef DEBUG
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| 294 | fprintf(logfile, "ftpd: parent %d child %d pasv done\n", getpid(), lpid);
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| 295 | fflush(logfile);
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| 296 | #endif
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| 297 | return(GOOD);
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| 298 | }
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| 299 |
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| 300 | if(ftpdata_fd >= 0)
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| 301 | return(GOOD);
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| 302 |
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| 303 | if((tcp_device = getenv("TCP_DEVICE")) == NULL)
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| 304 | tcp_device = TCP_DEVICE;
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| 305 |
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| 306 | if((ftpdata_fd = open(tcp_device, O_RDWR)) < 0) {
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| 307 | printf(msg425);
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| 308 | printf("425 Could not open tcp_device. Error %s\r\n", strerror(errno));
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| 309 | return(BAD);
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| 310 | }
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| 311 |
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| 312 | tcpconf.nwtc_flags = NWTC_LP_SET | NWTC_SET_RA | NWTC_SET_RP;
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| 313 | tcpconf.nwtc_remaddr = dataaddr;
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| 314 | tcpconf.nwtc_remport = dataport;
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| 315 | tcpconf.nwtc_locport = htons(20);
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| 316 |
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| 317 | s = ioctl(ftpdata_fd, NWIOSTCPCONF, &tcpconf);
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| 318 | if(s < 0) {
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| 319 | printf(msg425);
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| 320 | printf("425 Could not ioctl NWIOSTCPCONF. Error %s\r\n", strerror(errno));
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| 321 | close(ftpdata_fd);
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| 322 | ftpdata_fd = -1;
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| 323 | return(BAD);
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| 324 | }
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| 325 |
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| 326 | s = ioctl(ftpdata_fd, NWIOGTCPCONF, &tcpconf);
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| 327 | if(s < 0) {
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| 328 | printf(msg425);
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| 329 | printf("425 Could not ioctl NWIOGTCPCONF. Error %s\r\n", strerror(errno));
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| 330 | close(ftpdata_fd);
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| 331 | ftpdata_fd = -1;
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| 332 | return(BAD);
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| 333 | }
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| 334 |
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| 335 | tcpcopt.nwtcl_flags = 0;
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| 336 |
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| 337 | retry = 0;
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| 338 | do {
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| 339 | #ifdef DEBUG
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| 340 | fprintf(logfile, "try connect\n"); fflush(logfile);
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| 341 | fflush(logfile);
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| 342 | #endif
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| 343 | sleep(2);
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| 344 | s = ioctl(ftpdata_fd, NWIOTCPCONN, &tcpcopt);
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| 345 | #ifdef DEBUG
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| 346 | fprintf(logfile, "after connect %d %d\n", s, errno);
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| 347 | fflush(logfile);
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| 348 | #endif
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| 349 | if(!(s == -1 && errno == EAGAIN)) break;
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| 350 | if(retry++ > 10) break;
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| 351 | sleep(1);
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| 352 | } while(1);
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| 353 | if(s < 0) {
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| 354 | printf(msg425);
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| 355 | printf("425 Could not ioctl NWIOTCPCONN. Error %s\r\n", strerror(errno));
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| 356 | close(ftpdata_fd);
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| 357 | ftpdata_fd = -1;
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| 358 | return(BAD);
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| 359 | }
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| 360 |
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| 361 | s = ioctl(ftpdata_fd, NWIOGTCPCONF, &tcpconf);
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| 362 | if(s < 0) {
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| 363 | printf(msg425);
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| 364 | printf("425 Could not ioctl NWIOGTCPCONF. Error %s\r\n", strerror(errno));
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| 365 | close(ftpdata_fd);
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| 366 | ftpdata_fd = -1;
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| 367 | return(BAD);
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| 368 | }
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| 369 |
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| 370 | return(GOOD);
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| 371 | }
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| 372 |
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| 373 | /* Clean up stuff we did to get a Pasv connection going */
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| 374 | int CleanUpPasv()
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| 375 | {
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| 376 | int s, cs;
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| 377 |
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| 378 | if(lpid >= 0) {
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| 379 | kill(lpid, SIGKILL);
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| 380 | while(1) {
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| 381 | s = waitpid(lpid, &cs, 0);
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| 382 | if(s == lpid || (s == -1 && errno == ECHILD))
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| 383 | break;
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| 384 | }
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| 385 | }
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| 386 |
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| 387 | lpid = -1;
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| 388 |
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| 389 | didpassive = 0;
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| 390 |
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| 391 | return(GOOD);
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| 392 | }
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| 393 |
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| 394 | void GetNetInfo()
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| 395 | {
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| 396 | nwio_tcpconf_t tcpconf;
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| 397 | int s;
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| 398 | struct hostent *hostent;
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| 399 |
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| 400 | /* Ask the system what our hostname is. */
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| 401 | if(gethostname(myhostname, sizeof(myhostname)) < 0)
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| 402 | strcpy(myhostname, "unknown");
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| 403 |
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| 404 | /* lets get our ip address and the clients ip address */
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| 405 | s = ioctl(0, NWIOGTCPCONF, &tcpconf);
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| 406 | if(s < 0) {
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| 407 | printf("421 FTP service unable to get remote ip address. Closing.\r\n");
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| 408 | fflush(stdout);
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| 409 | exit(1);
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| 410 | }
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| 411 |
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| 412 | myipaddr = tcpconf.nwtc_locaddr;
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| 413 | myport = tcpconf.nwtc_locport;
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| 414 | rmtipaddr = tcpconf.nwtc_remaddr;
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| 415 | rmtport = tcpconf.nwtc_remport;
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| 416 |
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| 417 | /* Look up the host name of the remote host. */
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| 418 | hostent = gethostbyaddr((char *) &rmtipaddr, sizeof(rmtipaddr), AF_INET);
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| 419 | if(!hostent)
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| 420 | strcpy(rmthostname, inet_ntoa(rmtipaddr));
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| 421 | else {
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| 422 | strncpy(rmthostname, hostent->h_name, sizeof(rmthostname)-1);
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| 423 | rmthostname[sizeof(rmthostname)-1] = '\0';
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| 424 | }
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| 425 | }
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| 426 |
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| 427 | static void timeout(sig)
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| 428 | int sig;
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| 429 | {
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| 430 | gottimeout = 1;
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| 431 | }
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