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annotate toys/pending/telnetd.c @ 1363:e65f9a9ba62d draft

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Cleanup pass on mkpasswd.c
author Rob Landley <rob@landley.net>
date Wed, 25 Jun 2014 22:54:59 -0500
parents 04d754570e50
children 6a06541c090c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* telnetd.c - Telnet Server
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2 *
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3 * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
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4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
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5 *
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6 USE_TELNETD(NEWTOY(telnetd, "w#<0b:p#<0>65535=23f:l:FSKi[!wi]", TOYFLAG_USR|TOYFLAG_BIN))
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7
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8 config TELNETD
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9 bool "telnetd"
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10 default n
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11 help
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12 Handle incoming telnet connections
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13
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14 -l LOGIN Exec LOGIN on connect
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15 -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue
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16 -K Close connection as soon as login exits
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17 -p PORT Port to listen on
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18 -b ADDR[:PORT] Address to bind to
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19 -F Run in foreground
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20 -i Inetd mode
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21 -w SEC Inetd 'wait' mode, linger time SEC
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22 -S Log to syslog (implied by -i or without -F and -w)
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23 */
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24
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25 #define FOR_telnetd
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26 #include "toys.h"
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27 #include <utmp.h>
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28 GLOBALS(
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29 char *login_path;
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30 char *issue_path;
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31 int port;
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32 char *host_addr;
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33 long w_sec;
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34
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35 int gmax_fd;
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36 pid_t fork_pid;
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37 )
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38
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39
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40 # define IAC 255 /* interpret as command: */
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41 # define DONT 254 /* you are not to use option */
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42 # define DO 253 /* please, you use option */
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43 # define WONT 252 /* I won't use option */
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44 # define WILL 251 /* I will use option */
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45 # define SB 250 /* interpret as subnegotiation */
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46 # define SE 240 /* end sub negotiation */
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47 # define NOP 241 /* No Operation */
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48 # define TELOPT_ECHO 1 /* echo */
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49 # define TELOPT_SGA 3 /* suppress go ahead */
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50 # define TELOPT_TTYPE 24 /* terminal type */
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51 # define TELOPT_NAWS 31 /* window size */
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52
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53 #define BUFSIZE 4*1024
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54 struct term_session {
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55 int new_fd, pty_fd;
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56 pid_t child_pid;
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57 int buff1_avail, buff2_avail;
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58 int buff1_written, buff2_written;
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59 int rem; //unprocessed data from socket
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60 char buff1[BUFSIZE], buff2[BUFSIZE];
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61 struct term_session *next;
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62 };
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63
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64 struct term_session *session_list = NULL;
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65
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66 static void get_sockaddr(char *host, void *buf)
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67 {
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68 in_port_t port_num = htons(TT.port);
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69 struct addrinfo hints, *result;
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70 int status, af = AF_UNSPEC;
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71 char *s;
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72
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73 // [ipv6]:port or exactly one :
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74 if (*host == '[') {
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75 host++;
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76 s = strchr(host, ']');
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77 if (s) *s++ = 0;
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78 else error_exit("bad address '%s'", host-1);
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79 af = AF_INET6;
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80 } else {
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81 s = strrchr(host, ':');
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82 if (s && strchr(host, ':') == s) {
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83 *s = 0;
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84 af = AF_INET;
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85 } else if (s && strchr(host, ':') != s) {
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86 af = AF_INET6;
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87 s = 0;
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88 }
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89 }
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90
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91 if (s++) {
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92 char *ss;
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93 unsigned long p = strtoul(s, &ss, 0);
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94 if (!*s || *ss || p > 65535) error_exit("bad port '%s'", s);
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95 port_num = htons(p);
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96 }
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97
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98 memset(&hints, 0 , sizeof(struct addrinfo));
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99 hints.ai_family = af;
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100 hints.ai_socktype = SOCK_STREAM;
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101
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102 status = getaddrinfo(host, NULL, &hints, &result);
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103 if (status) error_exit("bad address '%s' : %s", host, gai_strerror(status));
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104
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105 memcpy(buf, result->ai_addr, result->ai_addrlen);
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106 freeaddrinfo(result);
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107
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108 if (af == AF_INET) ((struct sockaddr_in*)buf)->sin_port = port_num;
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109 else ((struct sockaddr_in6*)buf)->sin6_port = port_num;
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110 }
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111
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04d754570e50 Make telnetd use generic_signal(), inline kill_session(), close race window where a SIGCHLD could get lost.
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112 static void utmp_entry(void)
1162
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113 {
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114 struct utmp entry;
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115 struct utmp *utp_ptr;
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116 pid_t pid = getpid();
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117
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118 utmpname(_PATH_UTMP);
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119 setutent(); //start from start
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120 while ((utp_ptr = getutent()) != NULL) {
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121 if (utp_ptr->ut_pid == pid && utp_ptr->ut_type >= INIT_PROCESS) break;
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122 }
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123 if (!utp_ptr) entry.ut_type = DEAD_PROCESS;
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124 time(&entry.ut_time);
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125 setutent();
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126 pututline(&entry);
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127 }
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128
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129 static int listen_socket(void)
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130 {
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131 int s, af = AF_INET, yes = 1;
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132 char buf[sizeof(struct sockaddr_storage)];
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133
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134 memset(buf, 0, sizeof(buf));
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135 if (toys.optflags & FLAG_b) {
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136 get_sockaddr(TT.host_addr, buf);
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137 af = ((struct sockaddr *)buf)->sa_family;
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138 } else {
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139 ((struct sockaddr_in*)buf)->sin_port = htons(TT.port);
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diff changeset
140 ((struct sockaddr_in*)buf)->sin_family = af;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
141 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
142 s = xsocket(af, SOCK_STREAM, 0);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
143 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(yes)) == -1)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
144 perror_exit("setsockopt");
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
145
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
146 if (bind(s, (struct sockaddr *)buf, ((af == AF_INET)?
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
147 (sizeof(struct sockaddr_in)):(sizeof(struct sockaddr_in6)))) == -1) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
148 close(s);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
149 perror_exit("bind");
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
150 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
151
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
152 if (listen(s, 1) < 0) perror_exit("listen");
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
153 return s;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
154 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
155
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
156 static void write_issue(char *tty)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
157 {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
158 int size;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
159 char ch = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
160 struct utsname u;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
161 int fd = open(TT.issue_path, O_RDONLY);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
162
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
163 if (fd < 0) return ;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
164 uname(&u);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
165 while ((size = readall(fd, &ch, 1)) > 0) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
166 if (ch == '\\' || ch == '%') {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
167 if (readall(fd, &ch, 1) <= 0) perror_exit("readall!");
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
168 if (ch == 's') fputs(u.sysname, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
169 if (ch == 'n'|| ch == 'h') fputs(u.nodename, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
170 if (ch == 'r') fputs(u.release, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
171 if (ch == 'm') fputs(u.machine, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
172 if (ch == 'l') fputs(tty, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
173 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
174 else if (ch == '\n') {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
175 fputs("\n\r\0", stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
176 } else fputc(ch, stdout);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
177 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
178 fflush(NULL);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
179 close(fd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
180 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
181
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
182 static int new_session(int sockfd)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
183 {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
184 char *argv_login[2]; //arguments for execvp cmd, NULL
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
185 char tty_name[30]; //tty name length.
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
186 int fd, flags, i = 1;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
187 char intial_iacs[] = {IAC, DO, TELOPT_ECHO, IAC, DO, TELOPT_NAWS,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
188 IAC, WILL, TELOPT_ECHO, IAC, WILL, TELOPT_SGA };
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
189
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
190 setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
191 flags = fcntl(sockfd, F_GETFL);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
192 fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
193 if (toys.optflags & FLAG_i) fcntl((sockfd + 1), F_SETFL, flags | O_NONBLOCK);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
194
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
195 writeall((toys.optflags & FLAG_i)?1:sockfd, intial_iacs, sizeof(intial_iacs));
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
196 if ((TT.fork_pid = forkpty(&fd, tty_name, NULL, NULL)) > 0) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
197 flags = fcntl(fd, F_GETFL);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
198 fcntl(fd, F_SETFL, flags | O_NONBLOCK);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
199 return fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
200 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
201 if (TT.fork_pid < 0) perror_exit("fork");
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
202 write_issue(tty_name);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
203 argv_login[0] = strdup(TT.login_path);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
204 argv_login[1] = NULL;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
205 execvp(argv_login[0], argv_login);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
206 exit(EXIT_FAILURE);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
207 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
208
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
209 static int handle_iacs(struct term_session *tm, int c, int fd)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
210 {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
211 char *curr ,*start,*end;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
212 int i = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
213
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
214 curr = start = tm->buff2+tm->buff2_avail;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
215 end = tm->buff2 + c -1;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
216 tm->rem = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
217 while (curr <= end) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
218 if (*curr != IAC){
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
219
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
220 if (*curr != '\r') {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
221 toybuf[i++] = *curr++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
222 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
223 } else {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
224 toybuf[i++] = *curr++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
225 curr++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
226 if (curr < end && (*curr == '\n' || *curr == '\0'))
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
227 curr++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
228 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
229 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
230 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
231
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
232 if ((curr + 1) > end) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
233 tm->rem = 1;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
234 break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
235 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
236 if (*(curr+1) == IAC) { //IAC as data --> IAC IAC
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
237 toybuf[i++] = *(curr+1);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
238 curr += 2; //IAC IAC --> 2 bytes
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
239 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
240 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
241 if (*(curr + 1) == NOP || *(curr + 1) == SE) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
242 curr += 2;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
243 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
244 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
245
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
246 if (*(curr + 1) == SB ) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
247 if (*(curr+2) == TELOPT_NAWS) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
248 struct winsize ws;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
249 if ((curr+8) >= end) { //ensure we have data to process.
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
250 tm->rem = end - curr;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
251 break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
252 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
253 ws.ws_col = (curr[3] << 8) | curr[4];
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
254 ws.ws_row = (curr[5] << 8) | curr[6];
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
255 ioctl(fd, TIOCSWINSZ, (char *)&ws);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
256 curr += 9;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
257 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
258 } else { //eat non-supported sub neg. options.
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
259 curr++, tm->rem++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
260 while (*curr != IAC && curr <= end) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
261 curr++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
262 tm->rem++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
263 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
264 if (*curr == IAC) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
265 tm->rem = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
266 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
267 } else break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
268 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
269 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
270 curr += 3; //skip non-supported 3 bytes.
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
271 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
272 memcpy(start, toybuf, i);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
273 memcpy(start + i, end - tm->rem, tm->rem); //put remaining if we break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
274 return i;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
275 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
276
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
277 static int dup_iacs(char *start, int fd, int len)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
278 {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
279 char arr[] = {IAC, IAC};
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
280 char *needle = NULL;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
281 int ret = 0, c, count = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
282
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
283 while (len) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
284 if (*start == IAC) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
285 count = writeall(fd, arr, sizeof(arr));
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
286 if (count != 2) break; //short write
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
287 start++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
288 ret++;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
289 len--;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
290 continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
291 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
292 needle = memchr(start, IAC, len);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
293 if (needle) c = needle - start;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
294 else c = len;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
295 count = writeall(fd, start, c);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
296 if (count < 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
297 len -= count;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
298 ret += count;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
299 start += count;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
300 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
301 return ret;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
302 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
303
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
304 void telnetd_main(void)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
305 {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
306 errno = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
307 fd_set rd, wr;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
308 struct term_session *tm = NULL;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
309 struct timeval tv, *tv_ptr = NULL;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
310 int pty_fd, new_fd, c = 0, w, master_fd = 0;
1300
04d754570e50 Make telnetd use generic_signal(), inline kill_session(), close race window where a SIGCHLD could get lost.
Rob Landley <rob@landley.net>
parents: 1162
diff changeset
311 int inetd_m = toys.optflags & FLAG_i;
1162
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
312
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
313 if (!(toys.optflags & FLAG_l)) TT.login_path = "/bin/login";
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
314 if (!(toys.optflags & FLAG_f)) TT.issue_path = "/etc/issue.net";
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
315 if (toys.optflags & FLAG_w) toys.optflags |= FLAG_F;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
316 if (!inetd_m) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
317 master_fd = listen_socket();
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
318 fcntl(master_fd, F_SETFD, FD_CLOEXEC);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
319 if (master_fd > TT.gmax_fd) TT.gmax_fd = master_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
320 if (!(toys.optflags & FLAG_F)) daemonize();
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
321 } else {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
322 pty_fd = new_session(master_fd); //master_fd = 0
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
323 if (pty_fd > TT.gmax_fd) TT.gmax_fd = pty_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
324 tm = xzalloc(sizeof(struct term_session));
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
325 tm->child_pid = TT.fork_pid;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
326 tm->new_fd = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
327 tm->pty_fd = pty_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
328 if (session_list) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
329 tm->next = session_list;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
330 session_list = tm;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
331 } else session_list = tm;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
332 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
333
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
334 if ((toys.optflags & FLAG_w) && !session_list) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
335 tv.tv_sec = TT.w_sec;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
336 tv.tv_usec = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
337 tv_ptr = &tv;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
338 }
1300
04d754570e50 Make telnetd use generic_signal(), inline kill_session(), close race window where a SIGCHLD could get lost.
Rob Landley <rob@landley.net>
parents: 1162
diff changeset
339 signal(SIGCHLD, generic_signal);
1162
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
340
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
341 for (;;) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
342 FD_ZERO(&rd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
343 FD_ZERO(&wr);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
344 if (!inetd_m) FD_SET(master_fd, &rd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
345
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
346 tm = session_list;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
347 while (tm) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
348
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
349 if (tm->pty_fd > 0 && tm->buff1_avail < BUFSIZE) FD_SET(tm->pty_fd, &rd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
350 if (tm->new_fd >= 0 && tm->buff2_avail < BUFSIZE) FD_SET(tm->new_fd, &rd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
351 if (tm->pty_fd > 0 && (tm->buff2_avail - tm->buff2_written) > 0)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
352 FD_SET(tm->pty_fd, &wr);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
353 if (tm->new_fd >= 0 && (tm->buff1_avail - tm->buff1_written) > 0)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
354 FD_SET(tm->new_fd, &wr);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
355 tm = tm->next;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
356 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
357
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
358
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
359 int r = select(TT.gmax_fd + 1, &rd, &wr, NULL, tv_ptr);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
360 if (!r) return; //timeout
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
361 if (r < -1) continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
362
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
363 if (!inetd_m && FD_ISSET(master_fd, &rd)) { //accept new connection
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
364 new_fd = accept(master_fd, NULL, NULL);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
365 if (new_fd < 0) continue;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
366 tv_ptr = NULL;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
367 fcntl(new_fd, F_SETFD, FD_CLOEXEC);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
368 if (new_fd > TT.gmax_fd) TT.gmax_fd = new_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
369 pty_fd = new_session(new_fd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
370 if (pty_fd > TT.gmax_fd) TT.gmax_fd = pty_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
371
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
372 tm = xzalloc(sizeof(struct term_session));
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
373 tm->child_pid = TT.fork_pid;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
374 tm->new_fd = new_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
375 tm->pty_fd = pty_fd;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
376 if (session_list) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
377 tm->next = session_list;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
378 session_list = tm;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
379 } else session_list = tm;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
380 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
381
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
382 tm = session_list;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
383 for (;tm;tm=tm->next) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
384 if (FD_ISSET(tm->pty_fd, &rd)) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
385 if ((c = read(tm->pty_fd, tm->buff1 + tm->buff1_avail,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
386 BUFSIZE-tm->buff1_avail)) <= 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
387 tm->buff1_avail += c;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
388 if ((w = dup_iacs(tm->buff1 + tm->buff1_written, tm->new_fd + inetd_m,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
389 tm->buff1_avail - tm->buff1_written)) < 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
390 tm->buff1_written += w;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
391 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
392 if (FD_ISSET(tm->new_fd, &rd)) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
393 if ((c = read(tm->new_fd, tm->buff2+tm->buff2_avail,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
394 BUFSIZE-tm->buff2_avail)) <= 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
395 c = handle_iacs(tm, c, tm->pty_fd);
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
396 tm->buff2_avail += c;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
397 if ((w = write(tm->pty_fd, tm->buff2+ tm->buff2_written,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
398 tm->buff2_avail - tm->buff2_written)) < 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
399 tm->buff2_written += w;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
400 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
401 if (FD_ISSET(tm->pty_fd, &wr)) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
402 if ((w = write(tm->pty_fd, tm->buff2 + tm->buff2_written,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
403 tm->buff2_avail - tm->buff2_written)) < 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
404 tm->buff2_written += w;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
405 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
406 if (FD_ISSET(tm->new_fd, &wr)) {
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
407 if ((w = dup_iacs(tm->buff1 + tm->buff1_written, tm->new_fd + inetd_m,
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
408 tm->buff1_avail - tm->buff1_written)) < 0) break;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
409 tm->buff1_written += w;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
410 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
411 if (tm->buff1_written == tm->buff1_avail)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
412 tm->buff1_written = tm->buff1_avail = 0;
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
413 if (tm->buff2_written == tm->buff2_avail)
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
Rob Landley <rob@landley.net>
parents:
diff changeset
414 tm->buff2_written = tm->buff2_avail = 0;
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415 fflush(NULL);
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416 }
1300
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417
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418 // Loop to handle (unknown number of) SIGCHLD notifications
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419 while (toys.signal) {
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420 int status;
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421 struct term_session *prev = NULL;
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422 pid_t pid;
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423
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424 // funny little dance to avoid race conditions.
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425 toys.signal = 0;
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426 pid = waitpid(-1, &status, WNOHANG);
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427 if (pid < 0) break;
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428 toys.signal++;
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429
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430
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431 for (tm = session_list; tm; tm = tm->next) {
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432 if (tm->child_pid == pid) break;
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433 prev = tm;
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434 }
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435 if (!tm) return; // reparented child we don't care about
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436
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437 if (toys.optflags & FLAG_i) exit(EXIT_SUCCESS);
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438 if (!prev) session_list = session_list->next;
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439 else prev->next = tm->next;
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440 utmp_entry();
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441 xclose(tm->pty_fd);
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442 xclose(tm->new_fd);
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443 free(tm);
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444 }
1162
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445 }
213c00e7978e telnet and telnetd from Ashwini Sharma's guys.
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446 }