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5 .\" Manual: Linux-PAM Manual
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9 .TH "MISC_CONV" "3" "06/21/2011" "Linux-PAM Manual" "Linux-PAM Manual"
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170 misc_conv \- text based conversation function
177 #include <security/pam_misc\&.h>
183 .HP \w'void\ misc_conv('u
184 .BI "void misc_conv(int\ " "num_msg" ", const\ struct\ pam_message\ **" "msgm" ", struct\ pam_response\ **" "response" ", void\ *" "appdata_ptr" ");"
192 and not of the standard
194 library\&. This function will prompt the user with the appropriate comments and obtain the appropriate inputs as directed by authentication modules\&.
196 In addition to simply slotting into the appropriate
197 \fBpam_conv\fR(3), this function provides some time\-out facilities\&. The function exports five variables that can be used by an application programmer to limit the amount of time this conversation function will spend waiting for the user to type something\&. The five variabls are as follows:
199 \fBtime_t\fR \fIpam_misc_conv_warn_time\fR;
201 This variable contains the
204 \fBtime\fR(2)) that the user should be first warned that the clock is ticking\&. By default it has the value
205 0, which indicates that no such warning will be given\&. The application may set its value to sometime in the future, but this should be done prior to passing control to the
210 \fBconst char *\fR\fIpam_misc_conv_warn_line\fR;
212 Used in conjuction with
213 \fIpam_misc_conv_warn_time\fR, this variable is a pointer to the string that will be displayed when it becomes time to warn the user that the timeout is approaching\&. Its default value is a translated version of
214 \(lq\&.\&.\&.Time is running out\&.\&.\&.\(rq, but this can be changed by the application prior to passing control to
218 \fBtime_t\fR \fIpam_misc_conv_die_time\fR;
220 This variable contains the
223 \fBtime\fR(2)) that the will time out\&. By default it has the value
224 0, which indicates that the conversation function will not timeout\&. The application may set its value to sometime in the future, but this should be done prior to passing control to the
229 \fBconst char *\fR\fIpam_misc_conv_die_line\fR;
231 Used in conjuction with
232 \fIpam_misc_conv_die_time\fR, this variable is a pointer to the string that will be displayed when the conversation times out\&. Its default value is a translated version of
233 \(lq\&.\&.\&.Sorry, your time is up!\(rq, but this can be changed by the application prior to passing control to
237 \fBint\fR \fIpam_misc_conv_died\fR;
239 Following a return from the
241 libraray, the value of this variable indicates whether the conversation has timed out\&. A value of
243 indicates the time\-out occurred\&.
246 The following two function pointers are available for supporting binary prompts in the conversation function\&. They are optimized for the current incarnation of the
248 library and are subject to change\&.
250 \fBint\fR \fI(*pam_binary_handler_fn)\fR(\fBvoid *\fR\fIappdata\fR, \fBpamc_bp_t *\fR\fIprompt_p\fR);
252 This function pointer is initialized to
254 but can be filled with a function that provides machine\-machine (hidden) message exchange\&. It is intended for use with hidden authentication protocols such as RSA or Diffie\-Hellman key exchanges\&. (This is still under development\&.)
257 \fBint\fR \fI(*pam_binary_handler_free)\fR(\fBvoid *\fR\fIappdata\fR, \fBpamc_bp_t *\fR\fIdelete_me\fR);
259 This function pointer is initialized to
260 \fBPAM_BP_RENEW(delete_me, 0, 0)\fR, but can be redefined as desired by the application\&.
271 function is part of the
273 Library and not defined in any standard\&.