1 | #include "config.h" |
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2 | |
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3 | #include <sys/types.h> /* basic system data type */ |
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4 | #include <sys/socket.h> /* basic socket definitions */ |
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5 | #include <sys/time.h> /* timeval{} for select() */ |
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6 | #include <time.h> /* timespec{} for pselect() */ |
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7 | #include <netinet/in.h> /* sockaddr_in{} and other Internet defns */ |
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8 | #include <arpa/inet.h> /* inet(3) functions */ |
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9 | #include <errno.h> |
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10 | #include <fcntl.h> /* for nonblocking */ |
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11 | #include <netdb.h> |
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12 | #include <signal.h> |
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13 | #include <stdio.h> |
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14 | #include <stdlib.h> |
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15 | #include <string.h> |
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16 | #include <sys/stat.h> /* for S_xxx file mode constants */ |
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17 | #include <sys/uio.h> /* for iovec{} and readv/writev */ |
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18 | #include <unistd.h> |
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19 | #include <sys/wait.h> |
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20 | #include <sys/un.h> /* for Unix domain sockets */ |
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21 | |
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22 | #ifdef HAVE_SYS_SELECT_H |
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23 | #include <sys/select.h> /* for convenience */ |
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24 | #endif |
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25 | |
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26 | #ifdef HAVE_POLL_H |
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27 | #include <poll.h> /* for convenience */ |
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28 | #endif |
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29 | |
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30 | #ifdef HAVE_STRINGS_H |
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31 | #include <strings.h> /* for convenience */ |
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32 | #endif |
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33 | |
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34 | /* Three headers are normally needed for socket/file ioctl's: |
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35 | * <sys/ioctl.h>, <sys/filio.h> and <sys/sockio.h>. |
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36 | */ |
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37 | #ifdef HAVE_SYS_IOCTL_H |
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38 | #include <sys/ioctl.h> |
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39 | #endif |
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40 | |
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41 | #ifdef HAVE_SYS_FILIO_H |
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42 | #include <sys/filio.h> |
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43 | #endif |
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44 | |
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45 | #ifdef HAVE_SYS_SOCKIO_H |
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46 | #include <sys/sockio.h> |
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47 | #endif |
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48 | |
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49 | #ifdef HAVE_PTHREAD_H |
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50 | #include <pthread.h> |
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51 | #endif |
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52 | |
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53 | /* OSF/1 actually disable recv() and send() in <sys/socket.h> */ |
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54 | #ifdef __osf__ |
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55 | #undef recv |
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56 | #undef send |
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57 | #define recv(a,b,c,d) recvfrom(a,b,c,d,0,0) |
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58 | #define send(a,b,c,d) sendto(a,b,c,d,0,0) |
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59 | #endif |
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60 | |
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61 | #ifndef INADDR_NOME |
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62 | #define INADDR_NOME 0xffffffff /* should have been in <netinet/in.h> */ |
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63 | #endif |
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64 | |
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65 | #ifndef SHUT_RD /* these three Posix.1g names are quite now */ |
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66 | #define SHUT_RD 0 /* shutdown for reading */ |
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67 | #define SHUT_WR 1 /* shutdown for writing */ |
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68 | #define SHUT_RDWR 2 /* shutdown for reading and writing */ |
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69 | #endif |
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70 | |
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71 | #ifndef INET_ADDRSTRLEN |
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72 | #define INETADDRSTRLEN 16 /* "ddd.ddd.ddd.ddd\0" 1234567890123456 */ |
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73 | #endif |
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74 | |
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75 | /* Define following even if IPv6 not supported, so we can always allocate |
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76 | * an adequately-sized buffer, without #ifdefs in the code. |
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77 | */ |
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78 | #ifndef INET6_ADDRSTRLEN |
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79 | #define INET6_ADDRSTRLEN 46 /* max size of IPv6 address string: |
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80 | * "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx" or |
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81 | * "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd\0" |
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82 | * 1234567890123456789012345678901234567890123456 |
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83 | */ |
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84 | #endif |
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85 | |
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86 | /* Define bzero() as a macro if it's not standard C libary. */ |
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87 | #ifndef HAVE_BZERO |
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88 | #define bzero(ptr,n) memset(ptr,0,n) |
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89 | #endif |
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90 | |
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91 | /* Older resolvers do not have gethostbyname2() */ |
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92 | #ifndef HAVE_GETHOSTBYNAME2 |
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93 | #define gethostbyname2(host,family) gethostbyname((host)) |
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94 | #endif |
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95 | |
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96 | /* The structure returned by recvfrom_frags() */ |
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97 | //struct in_pktinfo |
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98 | //{ |
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99 | // struct in_addr ipi_addr; /* dst IPv4 address */ |
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100 | // int ipi_ifindex; /* received interface index */ |
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101 | //} |
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102 | |
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103 | /* We need the newer CMSG_LEN() and CMSG_SPACE() macros, but few |
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104 | * implementions support them today. These two macros really need |
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105 | * an ALIGN() macro, but each implementation does this differently. */ |
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106 | #ifndef CMSG_LEN |
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107 | #define CMSG_LEN(size) (sizeof(struct cmsghdr) + (size)) |
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108 | #endif |
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109 | #ifndef CMSG_SPACE |
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110 | #define CMSG_SPACE(size) (sizeof(struct cmsghdr) + (size)) |
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111 | #endif |
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112 | |
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113 | /* Posix.1g requires the SUN_LEN() macro but not all implementations |
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114 | * define it (yet). Note that this 4.4BSD macro works regardless |
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115 | * whether there is a length field or not |
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116 | */ |
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117 | #ifndef SUN_LEN |
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118 | #define SUN_LEN(su) (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path)) |
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119 | #endif |
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120 | |
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121 | /* Posix.1g remanes "Unix domain" as "local IPC". But |
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122 | * not all systems define AF_LOCAL and PF_LOCAL (yet). |
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123 | */ |
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124 | #ifndef AF_LOCAL |
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125 | #define AF_LOCAL AF_UNIX |
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126 | #endif |
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127 | #ifndef PF_LOCAL |
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128 | #define PF_LOCAL PF_UNIX |
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129 | #endif |
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130 | |
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131 | /* Posix.1g require that an include of <poll.h> define INFTIM, but |
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132 | * many systems still define it in <sys/stropts.h>. We don't want |
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133 | * to include all the streams stuff if it's not needed, so we just |
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134 | * define INFTIM here. This is the standard value, but there's no |
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135 | * guarantee it is -1. |
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136 | */ |
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137 | #ifndef INFTIM |
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138 | #define INFTIM (-1) /* infinite poll timeout */ |
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139 | #ifdef HAVE_POLL_H |
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140 | #define INFTIM_UNPH /* tell unpxti.h we defined it */ |
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141 | #endif |
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142 | #endif |
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143 | |
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144 | /* Following could be derived from SOMAXCONN in <sys/socket.h>, but many |
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145 | * kernels still #define it as 5, while actually supporting many more |
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146 | */ |
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147 | #define LISTENQ 1024 /* 2nd argument to listen() */ |
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148 | |
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149 | /* Miscellaneous constants */ |
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150 | #define MAXLINE 4096 /* max text line length */ |
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151 | #define MAXSOCKADDR 128 /* max socket address struct size */ |
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152 | #define BUFFSIZE 8192 /* buffer size for reads and writes */ |
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153 | |
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154 | /* Define some port number that can be used for client-servers */ |
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155 | #define SERV_PORT 9877 /* TCP and UDP client-servers */ |
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156 | #define SERV_PORT_STR "9877" /* TCP and UDP client-servers */ |
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157 | #define UNIXSTR_PATH "/tmp/unix.str" /* Unix domain stream cli-serv */ |
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158 | #define UNIXDG_PATH "/tmp/unix.dg" /* Unix domain datagram cli-serv */ |
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159 | |
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160 | /* Following shortens all the type casts of point arguments */ |
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161 | #define SA struct sockaddr |
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162 | #define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) /* default file access permissions for new files */ |
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163 | #define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH) /* default permissions for new directories */ |
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164 | |
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165 | typedef void Sigfunc(int); /* for signal handlers */ |
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166 | |
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167 | #define min(a,b) ((a) < (b) ? (a) : (b)) |
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168 | #define max(a,b) ((a) > (b) ? (a) : (b)) |
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169 | |
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170 | #include <stdarg.h> /* ANSI C hearder file */ |
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171 | #include <syslog.h> /* for syslog() */ |
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172 | |
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173 | int daemon_proc; |
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174 | |
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175 | static void err_doit(int, int, const char *, va_list); |
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176 | |
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177 | void err_ret(const char * fmt, ...) |
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178 | { |
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179 | va_list ap; |
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180 | va_start(ap, fmt); |
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181 | err_doit(1, LOG_INFO, fmt, ap); |
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182 | va_end(ap); |
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183 | return; |
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184 | } |
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185 | |
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186 | int err_sys(const char * fmt, ...) |
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187 | { |
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188 | va_list ap; |
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189 | va_start(ap, fmt); |
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190 | err_doit(1, LOG_INFO, fmt, ap); |
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191 | va_end(ap); |
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192 | exit(1); |
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193 | } |
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194 | |
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195 | void err_dump(const char * fmt, ...) |
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196 | { |
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197 | va_list ap; |
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198 | va_start(ap, fmt); |
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199 | err_doit(1, LOG_INFO, fmt, ap); |
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200 | va_end(ap); |
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201 | abort(); |
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202 | exit(1); |
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203 | } |
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204 | |
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205 | void err_msg(const char * fmt, ...) |
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206 | { |
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207 | va_list ap; |
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208 | va_start(ap, fmt); |
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209 | err_doit(1, LOG_INFO, fmt, ap); |
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210 | va_end(ap); |
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211 | return; |
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212 | } |
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213 | |
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214 | void err_quit(const char * fmt, ...) |
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215 | { |
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216 | va_list ap; |
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217 | va_start(ap, fmt); |
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218 | err_doit(1, LOG_INFO, fmt, ap); |
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219 | va_end(ap); |
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220 | exit(1); |
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221 | } |
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222 | |
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223 | static void err_doit(int errnoflag, int level, const char * fmt, va_list ap) |
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224 | { |
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225 | int errno_save, |
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226 | n; |
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227 | char buf[MAXLINE + 1]; |
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228 | |
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229 | errno_save = errno; |
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230 | #ifdef HAVE_VSNPRINTF |
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231 | vsnprintf(buf, MAXLINE, fmt, ap); |
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232 | #else |
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233 | vsprintf(buf, fmt, ap); |
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234 | #endif |
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235 | n = strlen(buf); |
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236 | if ( errnoflag ) |
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237 | snprintf(buf + n, MAXLINE - n, ": %s", strerror(errno_save)); |
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238 | else |
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239 | { |
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240 | fflush(stdout); |
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241 | fputs(buf, stderr); |
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242 | fflush(stderr); |
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243 | } |
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244 | return; |
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245 | } |
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246 | |
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247 | int Socket(int family, int type, int protocol) |
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248 | { |
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249 | int n; |
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250 | if ( (n = socket(family, type, protocol)) < 0 ) |
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251 | err_sys("socket error"); |
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252 | return(n); |
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253 | } |
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254 | |
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255 | void Listen(int fd, int backlog) |
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256 | { |
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257 | char * ptr; |
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258 | /* can override 2nd argument with environment variable */ |
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259 | if ( (ptr = getenv("LISTENQ")) != NULL ) |
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260 | backlog = atoi(ptr); |
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261 | if ( listen(fd, backlog) < 0 ) |
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262 | err_sys("listen error"); |
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263 | } |
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264 | |
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265 | /* Read 'n' bytes from a descriptor. */ |
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266 | ssize_t readn(int fd, void * vptr, size_t n) |
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267 | { |
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268 | size_t nleft; |
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269 | ssize_t nread; |
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270 | char * ptr; |
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271 | |
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272 | ptr = vptr; |
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273 | nleft = n; |
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274 | while ( nleft > 0 ) |
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275 | { |
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276 | if ( (nleft = read(fd, ptr, nleft)) < 0 ) |
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277 | { |
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278 | if ( errno == EINTR ) |
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279 | nread = 0; /* and call read() again */ |
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280 | else |
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281 | return (-1); |
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282 | } |
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283 | else if ( nread == 0 ) |
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284 | break; /* EOF */ |
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285 | |
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286 | nleft -= nread; |
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287 | ptr += nread; |
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288 | } |
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289 | return (n - nleft); /* return >= 0 */ |
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290 | } |
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291 | |
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292 | /* Write 'n' bytes to a descriptor. */ |
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293 | ssize_t writen(int fd, const void *(vptr), size_t n) |
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294 | { |
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295 | size_t nleft; |
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296 | ssize_t nwritten; |
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297 | const char * ptr; |
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298 | |
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299 | ptr = vptr; |
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300 | nleft = n; |
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301 | while ( nleft > 0 ) |
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302 | { |
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303 | if ( (nwritten = write(fd, ptr, nleft)) <= 0 ) |
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304 | { |
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305 | if ( errno == EINTR ) |
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306 | nwritten = 0; /*and call write() again */ |
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307 | else |
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308 | return (-1); /* error */ |
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309 | } |
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310 | |
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311 | nleft -= nwritten; |
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312 | ptr += nwritten; |
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313 | } |
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314 | return (n); |
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315 | } |
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316 | |
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317 | ssize_t readline(int fd, void *(vptr), size_t maxlen) |
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318 | { |
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319 | size_t n, |
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320 | rc; |
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321 | char c, |
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322 | * ptr; |
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323 | |
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324 | ptr = vptr; |
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325 | for ( n = 1; n < maxlen; n++ ) |
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326 | { |
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327 | again: |
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328 | if ( (rc = read(fd, &(c), 1)) == 1 ) |
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329 | { |
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330 | *(ptr)++ = c; |
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331 | if ( c == '\n' ) |
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332 | break; /* newline is stored, like fgets() */ |
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333 | } |
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334 | else if ( rc == 0 ) |
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335 | { |
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336 | if ( n == 1 ) |
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337 | return(0); /* EOF, no data read */ |
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338 | else |
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339 | break; /* EOF, some data read */ |
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340 | } |
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341 | else |
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342 | { |
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343 | if ( errno == EINTR ) |
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344 | goto again; |
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345 | return(-1); /* error, errno set by read() */ |
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346 | } |
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347 | } |
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348 | |
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349 | *(ptr) = 0; /* null terminate like fgets() */ |
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350 | return(n); |
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351 | } |
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352 | |
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353 | char * gf_time(void) |
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354 | { |
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355 | struct timeval tv; |
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356 | static char str[30]; |
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357 | char * ptr; |
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358 | |
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359 | if ( gettimeofday(&tv, NULL) < 0 ) |
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360 | err_sys("gettimeofday error"); |
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361 | |
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362 | ptr = ctime(&tv.tv_sec); |
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363 | strcpy(str, &ptr[11]); |
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364 | snprintf(str + 8, sizeof(str) - 8, ".%06d", tv.tv_usec); |
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365 | return(str); |
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366 | } |
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367 | |
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368 | void str_echo(int sockfd) |
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369 | { |
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370 | long arg1, |
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371 | arg2; |
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372 | ssize_t n; |
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373 | char line[MAXLINE]; |
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374 | |
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375 | for ( ; ; ) |
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376 | { |
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377 | if ( (n = readline(sockfd, line, MAXLINE)) == 0 ) |
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378 | return; /* connection closed by other end */ |
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379 | |
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380 | /*if ( sscanf(line, "%ld%ld", &(arg1), &(arg2)) == 2 ) |
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381 | snprintf(line, sizeof(line), "%ld\n", arg1 + arg2); |
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382 | else |
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383 | snprintf(line, sizeof(line), "input error\n"); |
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384 | |
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385 | n = strlen(line);*/ |
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386 | writen(sockfd, line, n); |
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387 | } |
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388 | } |
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389 | |
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390 | void str_cli(FILE * fp, int sockfd) |
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391 | { |
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392 | int maxfdp1, stdineof, val; |
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393 | ssize_t n, nwritten; |
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394 | fd_set rset, wset; |
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395 | char sendline[MAXLINE], |
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396 | recvline[MAXLINE]; |
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397 | char to[MAXLINE], |
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398 | fr[MAXLINE]; |
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399 | char * toiptr, |
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400 | * tooptr, |
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401 | * friptr, |
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402 | * froptr; |
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403 | |
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404 | val = fcntl(sockfd, F_GETFL, 0); |
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405 | fcntl(sockfd, F_SETFL, val| O_NONBLOCK); |
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406 | |
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407 | val = fcntl(STDIN_FILENO, F_GETFL, 0); |
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408 | fcntl(STDIN_FILENO, F_SETFL, val| O_NONBLOCK); |
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409 | |
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410 | val = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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411 | fcntl(STDOUT_FILENO, F_SETFL, val| O_NONBLOCK); |
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412 | |
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413 | toiptr = tooptr = to; |
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414 | friptr = froptr = fr; |
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415 | stdineof = 0; |
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416 | |
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417 | maxfdp1 = max(max(STDIN_FILENO, STDOUT_FILENO), sockfd) + 1; |
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418 | for ( ; ; ) |
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419 | { |
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420 | FD_ZERO(&(rset)); |
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421 | FD_ZERO(&(wset)); |
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422 | if ( stdineof == 0 && toiptr < &to[MAXLINE] ) |
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423 | FD_SET(STDIN_FILENO, &(rset)); /* read from stdin */ |
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424 | if ( friptr < &fr[MAXLINE] ) |
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425 | FD_SET(sockfd, &(rset)); /* read from socket */ |
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426 | if ( tooptr != toiptr ) |
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427 | FD_SET(sockfd, &(wset)); /* data to wrtite to socket */ |
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428 | if ( froptr != friptr ) |
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429 | FD_SET(STDOUT_FILENO, &(wset)); /* data to wrtite to stdout */ |
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430 | |
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431 | select(maxfdp1, &(rset), &(wset), NULL, NULL); |
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432 | |
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433 | if ( FD_ISSET(STDIN_FILENO, &(rset)) ) |
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434 | { |
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435 | if ( (n = readline(STDIN_FILENO, toiptr, &to[MAXLINE] - toiptr)) < 0 ) |
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436 | { |
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437 | if ( errno != EWOULDBLOCK ) |
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438 | err_sys("read error on stdin"); |
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439 | } |
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440 | else if ( n == 0 ) |
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441 | { |
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442 | fprintf(stderr, "%s: EOF on stdin\n", gf_time()); |
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443 | stdineof = 1; /* all done with stdin */ |
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444 | if ( tooptr == toiptr ) |
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445 | shutdown(sockfd, SHUT_WR); /* send FIN */ |
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446 | } |
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447 | else |
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448 | { |
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449 | fprintf(stderr, "%s: read %d bytes from socket\n", gf_time(), n); |
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450 | toiptr += n; /* # just read */ |
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451 | FD_SET(sockfd, &(wset)); /* try and write below */ |
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452 | } |
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453 | } |
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454 | |
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455 | if ( FD_ISSET(sockfd, &(rset)) ) |
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456 | { |
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457 | if ( (n = readline(sockfd, friptr, &fr[MAXLINE] - friptr)) < 0 ) |
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458 | { |
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459 | if ( errno != EWOULDBLOCK ) |
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460 | err_sys("read error on socket"); |
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461 | } |
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462 | else if ( n == 0 ) |
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463 | { |
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464 | fprintf(stderr, "%s: EOF on socket\n", gf_time()); |
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465 | if ( stdineof ) |
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466 | return; /* normal termination */ |
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467 | else |
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468 | err_quit("server terminated prematurely"); |
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469 | } |
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470 | else |
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471 | { |
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472 | fprintf(stderr, "%s: read %d bytes from socket\n", gf_time(), n); |
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473 | friptr += n; /* # just read */ |
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474 | FD_SET(STDOUT_FILENO, &(wset)); /* try and write below */ |
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475 | } |
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476 | } |
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477 | |
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478 | if ( FD_ISSET(STDOUT_FILENO, &(wset)) && ((n = friptr - froptr) < 0) ) |
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479 | { |
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480 | if ( (nwritten = write(STDOUT_FILENO, froptr, n)) < 0 ) |
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481 | { |
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482 | if ( errno != EWOULDBLOCK ) |
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483 | err_sys("write error to stdout"); |
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484 | } |
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485 | else |
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486 | { |
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487 | fprintf(stderr, "%s: wrote %d bytes to stdout\n", gf_time(), nwritten); |
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488 | froptr += nwritten; /* # just written */ |
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489 | if ( froptr == friptr ) |
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490 | froptr = friptr = fr; /* back to beginning of buffer */ |
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491 | } |
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492 | } |
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493 | |
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494 | if ( FD_ISSET(sockfd, &(wset)) && ((n = toiptr - tooptr) < 0) ) |
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495 | { |
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496 | if ( (nwritten = write(sockfd, tooptr, n)) < 0 ) |
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497 | { |
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498 | if ( errno != EWOULDBLOCK ) |
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499 | err_sys("write error to socket"); |
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500 | } |
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501 | else |
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502 | { |
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503 | fprintf(stderr, "%s: wrote %d bytes to socket\n", gf_time(), nwritten); |
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504 | tooptr += nwritten; /* # just written */ |
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505 | if ( tooptr == toiptr ) |
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506 | { |
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507 | tooptr = toiptr = to; /* back to beginning of buffer */ |
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508 | if ( stdineof ) |
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509 | shutdown(sockfd, SHUT_WR); /* send FIN */ |
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510 | } |
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511 | } |
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512 | } |
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513 | |
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514 | |
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515 | |
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516 | |
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517 | |
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518 | /* |
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519 | if ( FD_ISSET(fileno(fp), &(rset)) ) // input is readable |
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520 | { |
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521 | if ( fgets(sendline, MAXLINE, fp) == NULL ) |
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522 | { |
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523 | stdineof == 1; |
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524 | shutdown(sockfd, SHUT_WR); // send FIN |
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525 | FD_CLR(fileno(fp), &(rset)); |
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526 | continue; |
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527 | } |
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528 | writen(sockfd, sendline, strlen(sendline)); |
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529 | } |
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530 | */ |
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531 | } |
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532 | } |
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533 | |
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534 | Sigfunc * signal(int signo, Sigfunc * func) |
---|
535 | { |
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536 | struct sigaction act, |
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537 | oact; |
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538 | |
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539 | act.sa_handler = func; |
---|
540 | sigemptyset(&(act.sa_mask)); |
---|
541 | act.sa_flags = 0; |
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542 | if ( signo == SIGALRM ) |
---|
543 | { |
---|
544 | #ifdef SA_INTERRUPT |
---|
545 | act.sa_flags |= SA_INTERRUPT; /* SunOS 4.x */ |
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546 | #endif |
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547 | } |
---|
548 | else |
---|
549 | { |
---|
550 | #ifdef SA_RESTART |
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551 | act.sa_flags |= SA_RESTART; /* SVR4, 4.4BSD */ |
---|
552 | #endif |
---|
553 | } |
---|
554 | if ( sigaction(signo, &(act), &(oact)) < 0 ) |
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555 | return SIG_ERR; |
---|
556 | return oact.sa_handler; |
---|
557 | } |
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558 | |
---|
559 | void sig_chld(int signo) |
---|
560 | { |
---|
561 | pid_t pid; |
---|
562 | int stat; |
---|
563 | |
---|
564 | while ( (pid = waitpid(-1, &(stat), WNOHANG)) > 0 ) |
---|
565 | printf("child %d terminated\n", pid); |
---|
566 | return; |
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567 | } |
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