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lefcha |
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#include <stdio.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/socket.h> |
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#include <fcntl.h> |
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#include <netdb.h> |
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#include <netinet/in.h> |
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#include <string.h> |
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#include <regex.h> |
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#include "config.h" |
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#include "imapfilter.h" |
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#include "connect.h" |
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#include "log.h" |
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#include "imap.h" |
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int sock; |
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extern account_data account; |
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extern int options; |
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/* |
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* Connects to mailserver. |
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*/ |
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int establish_connection() |
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{ |
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struct sockaddr_in name; |
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struct hostent *hostinfo; |
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memset((char *) &name, 0, sizeof(struct sockaddr_in)); |
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sock = socket(PF_INET, SOCK_STREAM, 0); |
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if (sock < 0) { |
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error("imapfilter: create socket; %s\n", strerror(errno)); |
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return FAILURE; |
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} |
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if (!(hostinfo = gethostbyname(account.server))) { |
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error("imapfilter: get network host entry; %s\n", strerror(errno)); |
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close_connection(); |
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return FAILURE; |
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} |
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name.sin_family = AF_INET; |
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name.sin_port = htons(account.port); |
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name.sin_addr = *(struct in_addr *) hostinfo->h_addr; |
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if (connect(sock, (struct sockaddr *) &name, sizeof(struct sockaddr))) { |
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error("imapfilter: initiating connection; %s\n", strerror(errno)); |
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close_connection(); |
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return FAILURE; |
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} |
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verbose("Connected to %s.\n", hostinfo->h_name, account.port); |
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return SUCCESS; |
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} |
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/* |
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* Disconnects from mailserver. |
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*/ |
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int close_connection(void) |
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{ |
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if (close(sock)) { |
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error("imapfilter: closing socket; %s\n", strerror(errno)); |
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return FAILURE; |
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} else { |
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return SUCCESS; |
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} |
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} |
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/* |
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* Reads (if any) data the server sent. |
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*/ |
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int get_response(char *buf) |
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{ |
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int flags; |
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fd_set rfds; |
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struct timeval tv; |
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memset(buf, 0, RESPONSE_BUFFER_MAX); |
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tv.tv_sec = 10; |
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tv.tv_usec = 0; |
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flags = fcntl(sock, F_GETFL, 0); |
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fcntl(sock, F_SETFL, flags | O_NONBLOCK); |
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FD_ZERO(&rfds); |
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FD_SET(sock, &rfds); |
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if ((select(sock + 1, &rfds, NULL, NULL, &tv) > 0) |
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&& FD_ISSET(sock, &rfds)) { |
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if (read(sock, buf, RESPONSE_BUFFER_MAX - 1) != -1) { |
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#ifdef DEBUG |
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printf("\n%s\n", buf); |
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#endif |
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if (options & OPTION_DETAILS_VERBOSE) |
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analyze_response(buf); |
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fcntl(sock, F_SETFL, flags); |
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return SUCCESS; |
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} |
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} |
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fcntl(sock, F_SETFL, flags); |
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return FAILURE; |
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} |
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/* |
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* Clears stream from any data server sent without processing them. |
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*/ |
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int clear_stream(void) |
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{ |
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int r, saveopt; |
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char buf[RESPONSE_BUFFER_MAX]; |
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saveopt = options; /* Needed so response won't be analyzed. */ |
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options &= OPTION_DETAILS_CLEAR; |
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r = get_response(buf); |
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options = saveopt; |
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return r; |
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} |
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/* |
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* Processes the data that server sent due to IMAP SEARCH request sent |
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* from the client. |
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*/ |
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int search_response(char *results) |
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{ |
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int s; |
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char buf[RESPONSE_BUFFER_MAX]; |
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regex_t compexp; |
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regmatch_t match[2]; |
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const char *reg = "\\* SEARCH ([[:digit:] ]*)"; |
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get_response(buf); |
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regcomp(&compexp, reg, REG_EXTENDED); |
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if (!regexec(&compexp, buf, 2, match, 0)) { |
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s = min(match[1].rm_eo - match[1].rm_so, SEARCH_RESULTS_MAX - 1); |
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strncpy(results, buf + match[1].rm_so, s); |
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results[s] = 0; |
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return SUCCESS; |
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} else |
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return FAILURE; |
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} |
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/* |
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* Processes the data that server sent due to IMAP FETCH request sent |
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* from the client. |
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*/ |
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void fetch_response(char *results) |
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{ |
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int i, s, len = 0; |
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char buf[RESPONSE_BUFFER_MAX]; |
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regex_t compexp[3]; |
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regmatch_t match[1]; |
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const char *reg[3] = { |
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"Date: [[:print:]]*", |
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"From: [[:print:]]*", |
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"Subject: [[:print:]]*" |
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}; |
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get_response(buf); |
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for (i = 0; i < 3; i++) { |
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regcomp(&compexp[i], reg[i], REG_EXTENDED); |
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if (!regexec(&compexp[i], buf, 1, match, 0)) { |
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s = min(match[0].rm_eo - match[0].rm_so, |
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HEADERS_MAX - len - 1); |
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strncpy(results + len, buf + match[0].rm_so, s); |
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results[s + len] = '\n'; |
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results[s + len + 1] = 0; |
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len = strlen(results); |
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} |
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} |
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} |
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/* |
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* Checks if response of server to client's request was succesfully |
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* delivered or there was some kind of error. |
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*/ |
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void analyze_response(char *buf) |
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{ |
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int s; |
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regex_t compexp; |
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regmatch_t match[2]; |
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const char *reg = "[[:xdigit:]]{4,4} ([[:print:]]*)"; |
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char response[RESPONSE_BUFFER_MAX]; |
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regcomp(&compexp, reg, REG_EXTENDED); |
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if (!regexec(&compexp, buf, 2, match, 0)) { |
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s = min(match[1].rm_eo - match[1].rm_so, RESPONSE_BUFFER_MAX - 1); |
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strncpy(response, buf + match[1].rm_so, s); |
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response[s] = 0; |
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printf("Server response: %s\n", response); |
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} |
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} |