1 | /* |
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2 | * Steven Schultz - sms@moe.2bsd.com |
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3 | * |
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4 | * @(#)ctimed.c 1.0 (2.11BSD) 1996/6/25 |
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5 | * |
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6 | * ctimed - the daemon that supports the ctime() and getpw*() stubs |
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7 | * in 'libcstubs.a'. |
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8 | */ |
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9 | |
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10 | #include <signal.h> |
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11 | #include <stdio.h> |
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12 | #include <setjmp.h> |
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13 | #include <sys/ioctl.h> |
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14 | #include <sys/types.h> |
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15 | #include <sys/time.h> |
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16 | #include <pwd.h> |
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17 | #include <utmp.h> |
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18 | |
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19 | /* |
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20 | * These should probably be placed in an include file. If you add anything |
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21 | * here then you will also have to modify /usr/src/usr.lib/libstubs/stubs.c |
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22 | * (if for no other reason than to add the stub code). |
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23 | */ |
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24 | |
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25 | #define CTIME 1 |
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26 | #define ASCTIME 2 |
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27 | #define TZSET 3 |
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28 | #define LOCALTIME 4 |
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29 | #define GMTIME 5 |
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30 | #define OFFTIME 6 |
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31 | |
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32 | #define GETPWENT 7 |
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33 | #define GETPWNAM 8 |
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34 | #define GETPWUID 9 |
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35 | #define SETPASSENT 10 |
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36 | #define ENDPWENT 11 |
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37 | |
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38 | extern struct tm *offtime(); |
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39 | |
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40 | jmp_buf env; |
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41 | char *cp; |
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42 | char junk[256 + sizeof (struct passwd) + 4]; |
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43 | long off; |
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44 | time_t l; |
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45 | void timeout(), checkppid(); |
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46 | struct tm tmtmp, *tp; |
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47 | |
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48 | main() |
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49 | { |
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50 | register int i; |
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51 | register struct passwd *pw; |
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52 | struct itimerval it; |
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53 | u_char c, xxx; |
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54 | int len, tosslen; |
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55 | uid_t uid; |
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56 | |
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57 | signal(SIGPIPE, SIG_DFL); |
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58 | for (i = getdtablesize(); --i > 2; ) |
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59 | close(i); |
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60 | /* |
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61 | * Need a timer running while we disassociate from the control terminal |
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62 | * in case of a modem line which has lost carrier. |
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63 | */ |
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64 | timerclear(&it.it_interval); |
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65 | it.it_value.tv_sec = 5; |
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66 | it.it_value.tv_usec = 0; |
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67 | signal(SIGALRM, timeout); |
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68 | setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); |
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69 | if (setjmp(env) == 0) |
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70 | { |
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71 | i = open("/dev/tty", 0); |
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72 | if (i >= 0) |
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73 | { |
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74 | ioctl(i, TIOCNOTTY, NULL); |
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75 | close(i); |
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76 | } |
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77 | } |
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78 | /* |
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79 | * Now start a timer with one minute refresh. In the signal service |
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80 | * routine, check the parent process id to see if this process has |
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81 | * been orphaned and if so exit. This is primarily aimed at removing |
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82 | * the 'ctimed' process left behind by 'sendmail's multi-fork startup |
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83 | * but may prove useful in preventing accumulation of 'ctimed' processes |
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84 | * in other circumstances as well. Normally this process is short |
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85 | * lived. |
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86 | */ |
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87 | it.it_interval.tv_sec = 60; |
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88 | it.it_interval.tv_usec = 0; |
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89 | it.it_value.tv_sec = 60; |
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90 | it.it_value.tv_usec = 0; |
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91 | signal(SIGALRM, checkppid); |
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92 | setitimer(ITIMER_REAL, &it, (struct itimerval *) NULL); |
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93 | |
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94 | while (read(fileno(stdin), &c, 1) == 1) |
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95 | { |
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96 | switch (c) |
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97 | { |
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98 | case CTIME: |
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99 | l = 0L; |
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100 | getb(fileno(stdin), &l, sizeof l); |
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101 | cp = ctime(&l); |
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102 | write(fileno(stdout), cp, 26); |
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103 | break; |
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104 | case ASCTIME: |
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105 | getb(fileno(stdin), &tmtmp, sizeof tmtmp); |
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106 | cp = asctime(&tmtmp); |
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107 | write(fileno(stdout), cp, 26); |
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108 | break; |
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109 | case TZSET: |
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110 | (void) tzset(); |
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111 | break; |
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112 | case LOCALTIME: |
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113 | l = 0L; |
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114 | getb(fileno(stdin), &l, sizeof l); |
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115 | tp = localtime(&l); |
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116 | write(fileno(stdout), tp, sizeof (*tp)); |
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117 | strcpy(junk, tp->tm_zone); |
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118 | junk[24] = '\0'; |
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119 | write(fileno(stdout), junk, 24); |
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120 | break; |
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121 | case GMTIME: |
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122 | l = 0L; |
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123 | getb(fileno(stdin), &l, sizeof l); |
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124 | tp = gmtime(&l); |
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125 | write(fileno(stdout), tp, sizeof (*tp)); |
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126 | strcpy(junk, tp->tm_zone); |
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127 | junk[24] = '\0'; |
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128 | write(fileno(stdout), junk, 24); |
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129 | break; |
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130 | case OFFTIME: |
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131 | getb(fileno(stdin), &l, sizeof l); |
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132 | getb(fileno(stdin), &off, sizeof off); |
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133 | #ifdef __bsdi__ |
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134 | l += off; |
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135 | tp = localtime(&l); |
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136 | #else |
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137 | tp = offtime(&l, off); |
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138 | #endif |
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139 | write(fileno(stdout), tp, sizeof (*tp)); |
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140 | break; |
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141 | case GETPWENT: |
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142 | pw = getpwent(); |
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143 | do_pw(pw); |
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144 | break; |
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145 | case GETPWNAM: |
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146 | getb(fileno(stdin), &len, sizeof (int)); |
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147 | if (len > UT_NAMESIZE) |
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148 | { |
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149 | tosslen = len - UT_NAMESIZE; |
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150 | len = UT_NAMESIZE; |
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151 | } |
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152 | else |
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153 | tosslen = 0; |
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154 | getb(fileno(stdin), junk, len); |
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155 | for (;tosslen; tosslen--) |
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156 | getb(fileno(stdin), &xxx, 1); |
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157 | junk[len] = '\0'; |
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158 | pw = getpwnam(junk); |
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159 | do_pw(pw); |
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160 | break; |
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161 | case GETPWUID: |
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162 | getb(fileno(stdin), &uid, sizeof (uid_t)); |
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163 | pw = getpwuid(uid); |
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164 | do_pw(pw); |
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165 | break; |
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166 | case SETPASSENT: |
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167 | getb(fileno(stdin), &len, sizeof (int)); |
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168 | if (setpassent(len)) |
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169 | len = 1; |
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170 | else |
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171 | len = 0; |
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172 | write(fileno(stdout), &len, sizeof (int)); |
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173 | break; |
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174 | case ENDPWENT: |
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175 | endpwent(); |
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176 | break; |
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177 | default: |
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178 | abort("switch"); |
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179 | } |
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180 | } |
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181 | } |
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182 | |
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183 | getb(f, p, n) |
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184 | int f; |
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185 | register char *p; |
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186 | register int n; |
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187 | { |
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188 | register int i; |
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189 | |
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190 | while (n) |
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191 | { |
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192 | i = read(f, p, n); |
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193 | if (i <= 0) |
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194 | return; |
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195 | p += i; |
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196 | n -= i; |
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197 | } |
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198 | } |
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199 | |
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200 | void |
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201 | timeout() |
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202 | { |
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203 | |
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204 | longjmp(env, 1); |
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205 | } |
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206 | |
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207 | void |
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208 | checkppid() |
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209 | { |
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210 | |
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211 | if (getppid() == 1) |
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212 | exit(0); |
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213 | } |
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214 | |
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215 | do_pw(pw) |
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216 | struct passwd *pw; |
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217 | { |
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218 | int len; |
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219 | |
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220 | if (!pw) |
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221 | { |
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222 | len = 0; |
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223 | write(fileno(stdout), &len, sizeof (int)); |
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224 | return; |
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225 | } |
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226 | len = packpwtobuf(pw, junk); |
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227 | write(fileno(stdout), &len, sizeof (int)); |
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228 | write(fileno(stdout), pw, sizeof (*pw)); |
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229 | write(fileno(stdout), junk, len); |
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230 | return; |
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231 | } |
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232 | |
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233 | packpwtobuf(pw, buf) |
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234 | register struct passwd *pw; |
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235 | char *buf; |
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236 | { |
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237 | register char *cp = buf; |
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238 | register char *dp; |
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239 | |
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240 | dp = pw->pw_name; |
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241 | pw->pw_name = (char*) 0; |
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242 | while (*cp++ = *dp++) |
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243 | ; |
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244 | dp = pw->pw_passwd; |
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245 | pw->pw_passwd = (char*) (cp - buf); |
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246 | while (*cp++ = *dp++) |
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247 | ; |
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248 | dp = pw->pw_class; |
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249 | pw->pw_class = (char*) (cp - buf); |
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250 | while (*cp++ = *dp++) |
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251 | ; |
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252 | dp = pw->pw_gecos; |
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253 | pw->pw_gecos = (char*) (cp - buf); |
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254 | while (*cp++ = *dp++) |
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255 | ; |
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256 | dp = pw->pw_dir; |
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257 | pw->pw_dir = (char*) (cp - buf); |
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258 | while (*cp++ = *dp++) |
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259 | ; |
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260 | dp = pw->pw_shell; |
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261 | pw->pw_shell = (char*) (cp - buf); |
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262 | while (*cp++ = *dp++) |
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263 | ; |
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264 | return(cp - buf); |
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265 | } |
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