GopherProxy

	linkbrother.c - annna - Annna the nice friendly bot.
	git clone git://bitreich.org/annna/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws6…
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	linkbrother.c (4118B)
	---
	1 // cc linkbrother.c -o linkbrother
	2 //
	3 // Use: ./linkbrother LINKSFILE USER MESSAGE
	4
	5 #define _GNU_SOURCE // sorry
	6
	7 #include <stdlib.h>
	8 #include <stdio.h>
	9 #include <string.h>
	10 #include <ctype.h>
	11 #include <sys/types.h>
	12 #include <sys/stat.h>
	13 #include <sys/mman.h>
	14 #include <sys/time.h>
	15 #include <unistd.h>
	16 #include <fcntl.h>
	17 #include <time.h>
	18 #include <assert.h>
	19
	20 FILE* linksf;
	21 char* links;
	22 int linkslength;
	23 time_t now;
	24 int userlength;
	25
	26 void checklink(const char* user, const char* link) {
	27 int l = strlen(link);
	28 char* foundlink = (char*)memmem(links, linkslength, link, l);
	29 if (foundlink != NULL) {
	30 char* end = foundlink;
	31 while (!isspace(end) && end != 0) {
	32 end++;
	33 }
	34 end = 0;
	35 if (*(foundlink + l) == ' ') {
	36 char* nstart = foundlink + l + 1;
	37 char* whostart = strstr(nstart + 1, " ") + 1;
	38 char* whoend = strstr(whostart, "\n");
	39 time_t then = atoi(nstart);
	40 *whoend = 0;
	41
	42 time_t diff = now - then;
	43 char* unit;
	44 int unit_number;
	45
	46 if (diff < 60) {
	47 if (diff == 1) {
	48 unit = "second";
	49 } else {
	50 unit = "seconds";
	51 }
	52 unit_number = diff;
	53 } else if (diff < 60 * 60) {
	54 unit_number = diff / 60;
	55 if (unit_number == 1) {
	56 unit = "minute";
	57 } else {
	58 unit = "minutes";
	59 }
	60 } else if (diff < 60 * 60 * 24) {
	61 unit_number = diff / 60 / 60;
	62 if (unit_number == 1) {
	63 unit = "hour";
	64 } else {
	65 unit = "hours";
	66 }
	67 } else if (diff < 60 * 60 * 24 * 365) {
	68 unit_number = diff / 60 / 60 / 24;
	69 if (unit_number == 1) {
	70 unit = "day";
	71 } else {
	72 unit = "days";
	73 }
	74 } else {
	75 unit_number = diff / 60 / 60 / 24 / 365;
	76 unit = "year";
	77 }
	78
	79 if (strcmp(user, whostart) == 0) {
	80 switch (rand()%3) {
	81 case 0:
	82 printf("%s: You first posted that link %d %s ago!\n",
	83 user, unit_number, unit);
	84 break;
	85 case 1:
	86 printf("%s: We heard you the first time (%d %s ago).\n",
	87 user, unit_number, unit);
	88 break;
	89 case 2:
	90 printf("%s: %d %s ago you posted something similar. How about…
	91 user, unit_number, unit);
	92 break;
	93 }
	94 } else {
	95 switch (rand()%3) {
	96 case 0:
	97 printf("%s: %s already linked that %d %s ago.\n",
	98 user, whostart, unit_number, unit);
	99 break;
	100 case 1:
	101 printf("%s: Comrade! That link was first seen %d %s ago!\n",
	102 user, unit_number, unit);
	103 break;
	104 case 2:
	105 printf("%s: How nostalgic! Just like %s a whole %d %s ago!\n",
	106 user, whostart, unit_number, unit);
	107 break;
	108 }
	109 }
	110 }
	111 }
	112 /* Always log */
	113 fprintf(linksf, "%s %ld %s\n", link, (long int)now, user);
	114 }
	115
	116 int main(int argc, char** argv) {
	117 assert(argc == 4);
	118 char* dbfile = argv[1];
	119 char* user = argv[2];
	120 char* message = argv[3];
	121
	122 now = time(NULL);
	123 srand(now);
	124
	125 if (message != NULL && user != NULL) {
	126 struct stat fs;
	127
	128 userlength = strlen(user);
	129 linksf = fopen(dbfile, "a+");
	130 assert(linksf != NULL);
	131 fstat(fileno(linksf), &fs);
	132 linkslength = fs.st_size;
	133 links = mmap(NULL, linkslength, PROT_WRITE \| PROT_READ, MAP_PRIVATE,…
	134 while (1) {
	135 char* start, *end;
	136 int atend;
	137
	138 start = strstr(message, "http://");
	139
	140 if (start == NULL) {
	141 start = strstr(message, "https://");
	142 }
	143
	144 if (start == NULL) {
	145 start = strstr(message, "gopher://");
	146 }
	147
	148 if (start == NULL) {
	149 start = strstr(message, "gophers://");
	150 }
	151
	152 if (start == NULL) {
	153 return 0;
	154 }
	155
	156 end = start;
	157
	158 while (end != ' ' && end != 0) {
	159 end++;
	160 }
	161
	162 atend = *end == 0;
	163 *end = 0;
	164
	165 checklink(user, start);
	166
	167 if (atend) {
	168 return 0;
	169 }
	170
	171 message = end+1;
	172 }
	173 return 0;
	174 } else {
	175 return 1;
	176 }
	177 }